Agenda

1
Agenda

• INTRODUCTION
• TEMPERATURE SENSORS
• RESET SUPERVISORS
• CLOCK DISTRIBUTION SILICON OSCILLATOR
• SERIAL RTC / NVRAM

2
Advanced Analog On The Board
3
Advanced Analog Portfolio
Application Specific
Standard Products

• Voltage Detector
• (STM1061)
• Reset
• (STM809/810/811/812/18xx/6315)
• Reset with Watchdog
• (STM63xx, STM68xx))
• Supervisors
• (STM6xx, STM7xx, STM8xx))
• Multiple Voltage Reset
• (STM67xx)
• Quint Voltage Reset
• (STM6905)
• Stand alone watchdog
• (STWD100)
• Analogue Temp Sensor
• (STLM20)
• Digital Temp Sensor

• 32KHz Silicon Oscillator
• (STCL132)

Telecom

• Clock Distribution
• (STCD1040RDM6F)

Reset Supervisors

• Temperature Sensor for DRAM Modules
• (STTS424)

Computer

• VCOM for LCD panels
• (STVM100)
• Ultra Small Serial RTC
• (M41T6x)

• Reset with delayed
• Manual Reset
• (STM677x, STM6780)

Temperature Sensors
Consumer

• Security Supervisor
• (STM1403, STM1404, M41ST87)
• Ultra accurate
• Serial RTC
• (M41T83, M41T93, M41T00SC64)

• PC Clock
• (M48T86)
• 12MHz
• Silicon Oscillator
• (STCL1120)

Industrial
NVRAM

• Serial RTC
• (M41T81, M41T94)

Automotive
Advanced Analog Logic
4
Advanced AnalogNew Families to increase the
business
Maturity
New In 2008
Today
Mature

• NVRAM

• Serial RTC

• Reset and Supervisors

• Temperature Sensor

• Silicon Oscillator
• Clock Distribution

New Opportunities of Business
5
Thermal IC Product Classification

• Objective ST has embarked on a plan to develop
  application-specific value- added low current
  analog and digital temperature sensors for fast
  growing 3G mobile phones, PDAs, PCs and other
  markets. These products may combine other
  features such as multi-voltage monitoring, PWM
  for fan control.

6
Thermal IC Product Classification

• STTS424E02 ASSP for Mobile Laptop
• JC42.4 Jedec
• Target DDR2 DIMMs for next gen Mobile PCs

• STLM20 Analog Ultra Low Current (4.3uA)
• Target PDAs, Medical, LCD panels, White Goods,
  Industrial, 3G Phones

• STLM75 , DS75, CN75, TS75 Digital temp Sensor w /
  I2C bus
• Target wide range of applications (Industrial,
  STB, TVs, medical, computers...)

• STTS1617 Ultra Low Current Remote Temperature
  Sensor

• Roadmap

• In Production in Q1

7
Analog Temperature Sensors - STLM20
In an Analog Temperature Sensor, Vout is linear
to the temperature
Vout
2.5V
Vout -11.79mV/oC x T 1.8528V
Vcc
Vout
STLM20
GND
0.32V
Temperature
-55oC
130oC
8
STLM20 available in SC70 and UDFN
1.00mm
1.8mm
UDFN
1.3mm
SC70
1.9mm
1.3mm2
3.42mm2
Available only at ST Smallest temperature Sensor
with an accuracy of 2.5c
9
Comparison of linearity and currentSTLM20 vs.
High Accuracy (1) Thermistor
STLM20 superior linearity at much lower currents
than a high accuracy thermistor
10
STLM20

• STLM20
• Ultra low current Analog temperature sensor
  available in ultra small uDFN package
• Temperature Sensor Features
• Analog temperature sensor
• -55oc/130oC SC70 package
• -40oc/85oC uDFN package
• Supply voltage 2.7 to 5.5V across
• -55oc/130oC (2.4 to 5.5V across -40oc/130oC
• Current max across all conditions 8µA
• Accuracy _at_ 25oc /- 1.5
• Accuracy _at_ -55oc/130oC 2.5
• Ultra small uDFN package
• (1.3 mm x 1.0 mm)

• Applications
• Medical Instruments
• LED lighting
• GPS
• Fax machines

• Appliance
• 3G phones
• Alarms
• Metering

11
Portable Applications

• ST Solution
• 8µA max (lowest current available on the market)
• UDFN (smallest package available on the market.
  70 smaller than a standard SC70 used by the
  competition
• Laser trimming allows to have only best good dies
  on the wafer

• Constraints
• of the applications
• Current as low as possible
• Package as small as possible
• Best in class service

STLM20 The best choice for Temperature Sensor
in portable applications
12
STxx75 Digital Thermometer Thermal Watchdog
w/ I2C or SMBus

• Band gap based digital temperature sensor with
  I2C or SMBus Interface
• Delta-Sigma A to D Converter Resolution STLM75
  / STCN75 9 bit, STDS75 / STTS75 9 to 12 bits
• Low Power Shutdown (SD) mode for power sensitive
• Thermostat with User definable (host
  programmable) settings
• Comparator Mode
• Interrupt Mode
• Developed in SO8 and TSSOP8 packages

13
STxx75 Digital Thermometer Thermostat
(I2C/SMBus)

• Band gap based precision digital temperature
  sensor with I2C/SMBus Interface
• Delta-Sigma A to D Converter
• Resolution
• STLM75 9 bits (plug-in National LM75)
• STDS75 9 to 12 bits (plug-in Maxim/Dallas DS75)
• STCN75 9 bits (plug-in Microchip TCN75)
• STTS75 9 to 12 bit , one shot mode similar to
  Microchip TCN75A, SMBus time out option
• Thermostat with User definable (host
  programmable) settings.
• Comparator Mode
• Interrupt Mode
• Low Power Shutdown (SD) mode for power sensitive
  applications.
• 60 lower operating currents than competitors
  parts.
• Application any system controlled by processor
  with I2C or SMBus

14
STTS75 - Digital Temperature Sensor

• STTS75
• Low Current Precision Digital Temperature Sensor
  with Thermal Watchdog
• Temperature Sensor Features
• Measure temperature from -40 to 125oC
• /-2oC accuracy from -25 to 100oC
• Low operating current 100µA (max)
• Power supply 2.7 5.5V
• Power Saving one shot-mode temperature
  measurement
• Programmable temperature threshold and hysteresis
  set point for the thermal watchdog
• Thermometer resolution is user configurable from
  9 (default) to 12 bits (0.5oC to 0.0625oC)
• 2-wire I2C SMBus-compatible serial interface
• Selectable serial bus address allows connection
  up to 8 devices on the same bus
• Shutdown mode to minimize power consumption

• Applications
• Consumer TV, STB
• Motor Control
• Cellular base stations
• Office equipment
• GPS devices
• Industrial PCs
• Servers

15
Reset and Supervisors
16
Multiple Voltage Reset

• Where Products Are Used?
• To monitor DSP, ASIC, Microprocessor using
  several voltages, FPGA
• Applications
• STB, GPS,
• Servers
• Gaming console
• Portable applications (PMP, MP3)
• Key Features
• Monitors 2, 3, 4 or 5 voltages
• Can monitor down to 0.8V
• Manual Reset Input with optional delay
• Push-pull and Open Drain output
• Benefits
• Allow multiple voltage monitoring with push-pull
  output structure
• Decrease PCB space Vs various reset in Or
  structure

RESET IC
STOP, uP cant run
1st Voltage
µP DSP ASIC
2nd Voltage
OK, uP can run
3rd Voltage
17
6719 ApplicationBit mapped format
18
Why Would a Stand-alone Reset be Used with a
STR9xx?

• STR9xx family has an integrated LVD. However a
  stand-alone reset can be required in specific
  circumstances
• The LVD can be disabled by software as explained
  page 19 of the datasheet. Can be an issue for
  many applications security, medical, financial,
  
• If external components requiring a recovery time
  above 10ms are used.
• If a third voltage needs to be monitored on the
  board (for instance, programmable logic at 2.5V
  or a DSP at 1.2V)
• ...

19
STM67xx

• STM67xx
• Dual/Triple Ultra-Low Voltage Supervisors with
  Push-Button Reset (with Delay Option)
• Multiple Voltage Reset Features
• Monitors 2 or 3 voltages
• Primary Supply Monitor fixed reset threshold
  4.63V to 1.58V
• Secondary Supply Monitor fixed reset threshold
  3.08V to 0.79V
• Tertiary Supply Monitor (Using External
  Adjustable RSTIN) 0.626V Internal Reference
• Can monitor down to 0.8V
• Manual Reset Input with optional delay
• Push-pull and Open Drain output
• Low supply current 11µA
• Applications
• Anywhere where DSP, FPGA or multiple voltages
  ASIC and microcontrollers are used
• STB, GPS
• Servers
• Gaming console
• Portable applications (PMP, MP3)

20
STM6904/05

• STM6904/6905
• Quad/ Quint Ultra-Low Voltage Supervisors with
  Push-Button Reset
• Multiple Voltage Reset Features
• Monitors 4 or 5 voltages
• /- 1.8 accuracy across temp voltage
• Primary Supply Monitor fixed reset threshold
  3.078V to 2.866V
• Secondary Supply Monitor fixed reset threshold
  2.333V to 1.050V
• Additional Supply Monitors (Using External
  Adjustable RSTIN) 0.6V Internal Reference
• Selectable reset time-out period (STM6904)
• Manual Reset Input
• Open Drain output
• Low supply current 11µA
• Applications
• Anywhere where DSP, FPGA or multiple voltages
  ASIC and microcontrollers are used
• Set Top Boxes, GPS
• Servers
• Gaming console

MSOP/TSSOP 8
Note STM6904 V5IN replaced with Trec selector
21
STM1066 Smart Voltage Supervisor

• STM1066
• Smart Voltage Supervisor monitors Vcc and
  connects OUT to VIN or Ground based on the Vcc
  level and the state of EN and INH inputs
• Features
• Rising voltage detector threshold VTH 3.35V
• Threshold Hysteresis 400mV
• Supply current 15µA (max)
• Current limited output of 15mA (max)
• Operating Voltage 2.7 to 5.5V (Vcc)
• Voltage supply on VIN pin 2.4 to 5.5V
• Applications
• Cellular phone
• MP3 / PMP
• GPS
• Any portable application based on battery

Truth table
22
Example Hook-up Diagram STM1066
23
Enhanced Features Watchdog

• A Watchdog timer is used to protect the system
  against runaway software. If the system software
  fails to occasionally reset the Watchdog Timer,
  the Timer will reset the Microprocessor thereby
  restoring the system to proper operation.

24
Why use an External Watchdog?

• Applications with strict requirements on safety
  (i.e. medical applications, alarms)
• Microcontroller Applications with strict
  requirements on safety
• In a µController, the watchdog can be disabled by
  software ? doesnt provide full protection from a
  software bug
• In a µController, the watchdog timing is
  incremented with the µController clock ? dont
  provide full protection against hardware problem
• Applications requiring redundancy
• Applications requiring a longer watchdog than the
  one provided by the microcontroller (see watchdog
  in RTC where several minutes watchdog is
  available)

25
STWD100

• STWD100
• Watchdog Timer circuit with Chip Enable Pin
• Watchdog Features
• Supply voltage 2.7 to 5.5V across
• Low Supply current 4µA (typ)
• Push-Pull and Open Drain Output
• 4 watchdog Timeout Periods 3.4ms, 6.3ms, 102ms,
  1.6ms
• Watchdog Active Time 210ms (3.4ms if WD timeout
  period 3.4ms)
• Refresh by toggling the EN/ pin
• Chip Enable to stop the timing, giving the time
  to program the application or for a long boot-up

• Applications
• UPS
• Industrial
• Medical
• White goods

• Alarms
• Telecommunication
• Networking

26
Voltage Detector

• Where Products Are Used?
• Lower cost and More secure method for Power On
  system reset for Any applications
• Applications
• STB, GPS, DVD R/W
• Industrial
• Computer peripherals
• Portable applications (PMP, MP3)
• Key Features
• Power On Reset and Brown Out Detect at a
  determined voltage
• No Trec (Time Delay)
• Benefits
• Accurate Detection
• 1 or 2 bits ADC
• Window detection with 2 voltage detectors

VoltageDetector
STOP, µP cant run
µP DSP ASIC
Vcc Voltage
OK, µP can run
27
Stand-alone Reset

• Where Products Are Used?
• Any application where reset of Microcontroller or
  RC circuit cant be used for reliability issue
• Key Features
• Power On Reset and Brown Out Detect at a
  determined voltage
• Manual Reset Input
• Benefits
• Accurate Detection
• All output structures available (Push-Pull, Open
  Drain, Open Drain with integrated pull-up
  resistor, bi-directional)

STOP, µP cant run
µP DSP ASIC
Vcc Voltage
Push-Button
OK, µP can run
28
Enhanced Features Early Power-Fail Warning
(PFI-PFO)

• PFI-PFO is Power-Fail In/Power-Fail Out, and can
  be used to provide an Early Power-Fail Warning to
  the microprocessor. The unregulated power is
  monitored and used to predict when the regulated
  Vcc will begin to fail.

• R1 and R2 set the threshold, Vpfi. These are
  selected so that /PFO is asserted some time
  before Vcc begins to drop. Vcc will drop when
  Vunreg falls below the sum of Vcc and Vdo, the
  regulator drop out.
• For a 5V typical application, Vpfi might be set
  at 9V. When Vunreg falls below 9V, /PFO is
  asserted, and provides tSAVE seconds of advanced
  warning to the microprocessor, for it save data
  to NVRAM and gracefully shut down

29
Enhanced Features External Battery Switchover
and Write-Protect

• VINT is bonded to output pin supplies power to
  external LPSRAM
• Internal switch must be capable of handling
  higher active currents (100-150mA) of external
  LPSRAMs

• Chip-Enable to external LPSRAM is gated through
  device implements write-protect function

30
Microprocessor Supervisors

• Where Products Are Used?
• Applications where functions are not integrated
  inside the µP or cant be used for software,
  consumption and/or reliability issue
• Key Features
• Reset
• Watchdog
• PFI/PFO (Power Fail Input, Power Fail Output) /
  Early Power Fail Warning
• Benefits
• Lower current than Microcontrollers
• Parameters of the functions Independent of
  Software Bugs
• All Supervisory functions integrated in one chip

µP Supervisor
STOP, µP cant run
µP DSP ASIC
Vcc Voltage
Push-Button
OK, µP can run
Early Power Fail Warning
Watchdog, µP confirms it controls the applications
31
µP Supervisors with Switch Over

• Where Products Are Used?
• Applications data of an SRAM must be protected
  during a power down
• Key Features
• Reset
• Watchdog
• PFI/PFO (Power Fail Input, Power Fail Output) /
  Early Power Fail Warning
• Switch Over
• Benefits
• Create a low cost NVRAM
• All Supervisory functions integrated in one chip

µP Supervisor
RAM
Switch
STOP, µP cant run
µP DSP ASIC
Vcc Voltage
Push-Button
OK, µP can run
Early Power Fail Warning
Watchdog, µP confirms it controls the applications
32
Security Products

• Where Products Are Used?
• Applications where sensitive information must be
  protected against intrusion in the system
• Applications
• Point of Sales, cash machine
• Metering
• Encryption devices
• Gaming-casino
• Key Features
• Physical, Voltage and Temperature Tamper
• Microprocessor Supervisory functions (reset,
  PFI/PFO, switch over)
• QFN package for high protection (pins not
  accessible)
• Benefits
• STM14xx Grouping physical, voltage and
  temperature tamper in one device to meet POS
  norms
• Easy design to replace many discrete components

Security Supervisor
Attack Detected
Sensitive Data Protected
33
STM1403 / 1404 Security Supervisor

• Where Products Are Used?
• Applications where sensitive information must be
  protected against intrusion in the system
• Applications
• Cash registers / Point of sales
• Encryption devices
• ATMs
• Key Features
• Physical, under and over voltage Tamper detect
• Temperature Tamper (STM1404)
• Reset and Manual Reset
• PFI/PFO (Power Fail Input, Power Fail Output) /
  Early Power Fail Warning
• Switch Over to turn an SRAM into NVRAM
• Benefits
• All security functions security to meet FIPS104-3
  and FIPS104-4 in one die

Physical, voltage, temperature tamper
Sensitive Data Protected
RAM
Switch
STOP, µP cant run
µP DSP ASIC
Vcc Voltage
Push-Button
OK, µP can run
Early Power Fail Warning
34
M41ST87 Serial RTC with Tamper
An NVRAM supervisor

• We have combined in one chip

A microprocessor supervisor
A Serial Real-Time Clock with Alarm, Watchdog,
32KHz out, Square wave
A TamperCircuit
I2C
35
M41ST87 Applications
Embedded Crystal Packaging
36
Serial Real Time Clock
37
M41T60

• M41T60Q6F
• Ultra low current I2C Real Time Clock
• RTC Features
• 350 nanoamps standby (typ) at 3.0V
• 1.3V-4.4V Operation
• Timekeeping down to 1.0V
• 400 kHz I2C Interface
• BCD Registers for Year, Month, Day, Date, Hours,
  Minutes, Seconds
• 2 Century bits (Y2.3K compliant)
• Automatic Leap Year Adjustment
• Oscillator Fail Detect
• -40º to 85ºC operating range
• Clock calibration
• Tiny 3mm x 3mm Lead-free QFN16 package

• Applications
• Metering
• Access control
• Alarm system
• Printers
• STB
• Portable Multimedia Players

38
M41T62

• M41T62Q6F
• Ultra low current I2C Real Time Clock with alarm
  32KHz
• RTC Features
• 350 nanoamps standby (typ) at 3.0V
• 1.3V - 4.4V Operation
• Timekeeping down to 1.0V
• 400 kHz I2C Interface
• BCD Registers for Year, Month, Day, Date, Hours,
  Minutes, Seconds
• 10ths and 100ths of seconds
• 2 Century bits (Y2.3K compliant)
• Automatic Leap Year Adjustment
• Clock calibration
• Oscillator Fail Detect
• -40º to 85ºC operating range
• Tiny 3mm x 3mm Lead-free QFN16 package

• Applications
• Metering
• Access control
• Alarm system
• Printers
• STB
• Portable Multimedia Players

• Programmable Alarm with repeat modes
• Programmable Watchdog 62.5ms to
  31min
• Programmable Squarewave
• Powers up at 32KHz (can be turned off)

39
M41T64

• M41T64Q6F
• Ultra low current I2C Real Time with dual 32KHz
  output
• RTC Features
• 350 nanoamps standby (typ) at 3.0V
• 1.3V-4.4V Operation
• Timekeeping down to 1.0V
• 400 kHz I2C Interface
• BCD Registers for Year, Month, Day, Date, Hours,
  Minutes, Seconds
• 10ths and 100ths of seconds
• 2 Century bits (Y2.3K compliant)
• Automatic Leap Year Adjustment
• Clock calibration
• Oscillator Fail Detect
• Accept high resistance crystals
• -40º to 85ºC operating range
• Tiny 3mm x 3mm Lead-free QFN16 package

• 32KHz output push-pull
• Programmable Square Wave Output from 1Hz to 32KHz
  (Open Drain)

• Applications
• Portable consumer products (PMP
• PC Accessories
• Bluetooth / WiFi / FM systems
• Glucose meter

40
M41T65

• M41T65Q6F
• Ultra low current I2C Real Time Clock with alarm
  Watchdog
• RTC Features
• 350 nanoamps standby (typ) at 3.0V
• 1.3V-4.4V Operation
• Timekeeping down to 1.0V
• 400 kHz I2C Interface
• BCD Registers for Year, Month, Day, Date, Hours,
  Minutes, Seconds
• 10ths and 100ths of seconds
• 2 Century bits (Y2.3K compliant)
• Automatic Leap Year Adjustment
• Clock calibration
• Oscillator Fail Detect
• Accept high resistance crystals
• -40º to 85ºC operating range
• Tiny 3mm x 3mm Lead-free QFN16 package

• Applications
• Metering
• Access control
• Alarm system
• Printers
• STB
• Portable Multimedia Players

• Programmable Alarm with repeat modes
• Programmable Watchdog 62.5ms to 31min
• Dedicated pin for Watchdog

41
M41T00AUD

• M41T00AUDD1F
• Ultra low current I2C Real Time Clock with Audio
  Amplifier
• RTC Features
• 400 nanoamps standby (typ) at 3.0V
• 3.0V-3.6V Operation
• Timekeeping down to 1.7V
• 400 kHz I2C Interface
• Trickle Charge circuit for backup capacitor

• Audio Amplifier Features
• Provides 300mW in 8O (Harmonic Distortion 2
  (max))
• Summing node at Audio input
• Volume control, 4-bit register
• Allows gain adjustment from -33dB to 12dB
• 3dB steps
• Audio automatically shuts off in back-up mode

• Applications
• Access control
• Printers
• Portable application with small outspeaker

DFN16 (5mm x 4mm)
42
Oscillator Fail DetectHow it works

• Generally speaking, logic circuits (here,
  flip-flops) will continue functioning after the
  oscillator begins to fail due to low VCC
• Missing Pulse Detector sets flip-flip if four
  consecutive pulses are dropped
• Software clears OF bit
• Optional interrupt output can be enable by
  software setting OFIE
• OF bit indicates when time is likely corrupted
• Software writers need OF bit to tell them when to
  re-initialize the clock (time)

43
Real-Time Clock/Calendar

• How does it work?

Accuracy of the RTC depends on accuracy 32KHz
oscillator
44
Quartz PropertiesThe Three Parameters

• Parts are designed with 35ppm nominal bound on
  the crystal frequency ( 90 seconds per month)
• 15ppm due to load capacitance
• 20ppm due to crystal (A better crystal can be
  used to improve performance)
• Calibration can pull it down to 2ppm about 5
  seconds per month

45
Software Calibration

• The value entered in the Calibration Register
  determines whether
• Pulses are added to speed up a slow clock
• OR
• Pulses are dropped to slow a fast clock

46
Serial Real Time Clock M41T83/93

• Where Products Are Used?
• Application that must save time during a power
  down or working on battery
• Applications
• Office Applications (e.g. Printers)
• Metering
• Portable applications (PMP, MP3, DSC)
• Safety and Security Systems
• Key Features
• Low Power Real Time Clock with 2 alarms
• Software and analog calibration for accurate
  clock
• 32KHz Output to drive µP in low Power Mode
• Reset Open Drain
• Benefits
• Compact solution for portable applications
• Guaranteed Accurate time

• Key New Features
• Low cost SPI Real Time Clock
• Analog calibration for instantaneous feedback
  about the accuracy of the RTC
• Pre-programmed calibration at factory to ship an
  ultra accurate RTC (/-2PPM)

I2C Communication
µP DSP ASIC
Alarm
32KHz
Low Power RTC
47
Oscillation Circuit Design (Pierce Oscillator)
A basic oscillator circuit contains an inverter
and a load capacitance. In the circuit below, the
load capacitance is represented by Cg and Cd in
series (equivalent to a CL load capacitance in
parallel)
Cg
Cd
Cg and Cd are either on the silicon of the
oscillator circuit OR need to be added externally
48
Crystal Accuracy Vs Load Capacitance

• The crystal determines the frequency of the
  oscillator
• Crystal capacitance has some variation which will
  affect oscillator frequency
• Stray capacitances in the IC package and on the
  printed circuit will also affect oscillator
  frequency
• Load capacitance, built into RTC, is intended to
  be matched to with the crystal capacitance to get
  the best accuracy, but it too has manufacturing
  variations which can pull the oscillator off
  frequency

On the left Examples of the Crystal accuracy for
a SEIKO Crystal VT-200 requesting a load
capacitance of 12.5pF
49
Analog Calibration

• Analog Calibration value causes capacitance to be
  added or removed thus tuning the oscillator
  frequency
• All devices (with Analog Cal) will include the
  Analog Calibration Register
• Those with on-board crystal (ie, in the Embedded
  Crystal package) will also include a One-Time
  Programmable word for analog cal.
• OTP will be pre-programmed at the factory. Users
  have the configuration option of using factory
  cal or over-riding it with another user
  selectable value

• Analog Calibration is in addition to Digital
  Calibration
• Provides instantaneous feedback

50
M41T83(S/T/Z)YM6

• M41T83xYM6
• Serial RTC with Embedded crystal Accurate at
  /-5PPM _at_ 25oc after 2 reflows, 2 alarms reset,
  Watchdog and 32KHz RTC Features
• Automatic Battery Switchover and Write-Protect
• 2.5-5.5V Operation
• Timekeeping down to 1.8V
• Three VPFD (VRST) Options
• 450 nA Battery draw (typical)
• 400 kHz I2C
• Memory-mapped BCD Year, Month, Day, Date, Hours,
  Minutes, Seconds, 10ths, 100ths of seconds
• -40 to 85C
• SOX18 Package (embedded crystal)

• Applications
• Energy Metering
• Access control
• Alarm system
• Gaming
• Surveillance
• Vending Machine
• Taxi meters

• Analog calibration
• Real-time, Instantaneous feedback

51
M41T83/T93 QFN

• RTC with Automatic Battery Switchover and
  Write-Protect
• Precision reference
• Memory-mapped BCD Year, Month, Day, Date, Hours,
  Minutes, Seconds
• 10ths, 100ths of seconds
• 400kHz I2C on M41T83
• SPI on M41T93
• 2.5-5.5V Operation
• Timekeeping down to 1.8V
• Three VPFD (VRST) Options
• 300 nA Battery draw (typical)
• 7 Bytes of NVRAM
• 5 More Bytes of NVRAM optional (via Alarm2
  Registers)

• 2 Programmable Alarms with repeat modes
• Programmable Watchdog
• 62.5ms to 128s
• -40 to 85C
• Programmable Square-wave Generator
• 1Hz to 32kHz
• 32KHz ON at Power-Up
• Can be disabled

• 16-pin QFN (4 mm x 4 mm)
• Dual Calibration Features
• Analog calibration
• Real-time, Instantaneous feedback
• Stored in Non-Volatile Register
• Digital calibration
• ST standard, Augments analog calibration

52
M41T82(S/T/Z)M6

• M41T82xM6
• Serial RTC with Analog calibration to reach an
  accuracy of /-4PMM _at_ 25oc and Reset
• RTC Features
• Automatic Battery Switchover and Write-Protect
• 2.5-5.5V Operation
• Timekeeping down to 1.8V
• Three VPFD (VRST) Options
• 450 nA Battery draw (typical)
• 400 kHz I2C
• Memory-mapped BCD Year, Month, Day, Date, Hours,
  Minutes, Seconds, 10ths, 100ths of seconds
• -40 to 85C
• SO8 Package

• Dual Calibration Features
• Analog calibration
• Real-time, Instantaneous feedback
• Stored in Non-Volatile Register
• Digital calibration
• ST standard, Augments analog calibration

• Applications
• Metering
• Access control
• Alarm system
• Printers
• Surveillance
• Vending Machine
• Taxi meters

53
M41T94 Automotive SPI Bus RTC with Alarm, Reset
and Watchdog

• Serial RTC features
• Memory-mapped BCD year, month, day, date, hours,
  Minutes, seconds, 10ths and 100ths of seconds
• Programmable alarm with repeat mode
• Programmable Square Wave Generator - 1Hz to
  32KHz
• Integrated Battery Switchover and Write Protect
• 2MHz SPI bus
• 500nA Battery Draw
• 2.7 5.5V Operating Voltage
• -40 to 85C
• Calibration to reach a /-4PPM accuracy at a
  given temperature
• SO16 package
• 44 bytes of NVRAM
• uP Supervisor functions
• Power-on reset/low-voltage detect
• THS pins selects 3 or 5V operation
• Programmable watchdog - 62.5ms to 128s
• 2 Reset inputs (including one Manual Reset)
• Battery monitor

54
M41T81 Automotive I2C RTC with Alarm and
Watchdog

• Serial RTC features
• Memory-mapped BCD year, month, day, date, hours,
  Minutes, seconds, 10ths and 100ths of seconds
• Programmable alarm with repeat mode
• Programmable Square Wave Generator - 1Hz to
  32kHz
• Integrated Battery Switchover and Write Protect
• 400kHz I2C bus
• 1µA Battery Draw
• 2.0 5.5V Operating Voltage
• -40 to 85C
• SO8 package
• Calibration to reach a /-4PPM accuracy at a
  given temperature
• uP Supervisor functions
• Programmable watchdog - 62.5ms to 128s

55
Feature Rich Real-Time Clocks

• Where Products Are Used?
• Applications where data of an SRAM and Time must
  be kept during a power down
• Key Features
• Low Power RTC
• Reset
• Watchdog
• PFI/PFO (Power Fail Input, Power Fail Output) /
  Early Power Fail Warning
• Switch Over to turn an SRAM into NVRAM
• Benefits
• Create a low cost NVRAM
• All Supervisory functions RTC integrated in one
  chip

RTC
RAM
Switch
STOP, µP cant run
µP DSP ASIC
Vcc Voltage
Push-Button
OK, µP can run
Early Power Fail Warning
Watchdog, µP confirms it controls the applications
56
M41ST84 / M41T94
Enhanced Serial RTCs with Microprocessor
Supervisors

• Serial RTC features
• 44 bytes of NVRAM
• Programmable alarm with repeat mode
• Programmable Square Wave Generator - 1Hz to
  32kHz
• 10ths and 100ths of seconds
• Integrated Battery Switchover and Write Protect
• 400kHz I2C (M41ST84)
• SPI bus (M41T94)
• uP Supervisor functions
• Early Power-Fail Warning (PFI/PFO) with 1.25V
  reference (Only on M41ST84)
• Power-on reset/low-voltage detect
• Programmable watchdog - 62.5ms to 128s
• Reset inputs
• One on M41ST84
• Two on M41T94
• Battery monitor

• 500nA Battery Draw
• -40 to 85C

• M41T94
• THS pins selects 3 or 5V operation
• 16-lead SOIC
• 28-lead SNAPHAT SOIC
• M41ST84
• 3V versions
• 16-lead SOIC

57
M41ST85 / M41ST95

• NVRAM Supervisor Non-volatizes external LPSRAM
• Battery Switchover
• Power-Fail Write Protect
• Battery Monitor
• Serial RTC
• Counters for 10ths/100ths of seconds, seconds,
  minutes, hours, day, date, month, year, and
  century
• 44 Bytes of NVRAM
• Programmable Alarm
• 32KHz output (ST95 only)
• Programmable Square wave generator
• uP Supervisor
• Programmable Watchdog
• Power-On Reset/ Low-Voltage Detect
• Early Power-Fail Warning circuits (PFI-PFO)
• 3V and 3.3V operation
• 500 nA battery current (typ)

58
NVRAM

• Where Products Are Used?
• Where data logging is required and parameters of
  the applications must be continuously changed and
  saved during a power down
• Key Features
• Non Volatile memory with
• Unlimited endurance
• 8 bit granularity
• High speed read / write cycles
• Low Power Real Time Clock (Option)
• Benefits
• Module product saving design time
• DIP package allows to remove the part for remote
  further analysis

Switch
µP DSP ASIC
Vcc
RAM
RTC
59
Clock Distribution
To reduce cost on crystal, replace the crystals
on other blocks with clock generated from the TCXO
60
STCD1040

• STCD1040
• Multi-channel clock distribution circuit with
  individual clock enable for each output
• Features
• 4 outputs buffered clock distribution
• Operating voltage 2.5 3.6V
• Master Clock Frequency 10 - 52MHz
• Active current 3.4mA _at_ 26MHz (typ)
• Individual clock enable for each output
• Additive phase noise -145dBc/Hz _at_ 10KHz offset
• Package TDFN 12 lead (2mm x 3mm)

• Applications
• Cellular phone
• GPS
• Portable applications
• Multi-mode RF clock reference

61
STCD1020/30/40

• Clock buffer distribution circuit with 2/3/4
  output clocks
• Provides clocks to different chipsets such as RF,
  WLAN, BT, FM radio, GPS
• Device input master clock frequency range 10MHz
  to 52 MHz, sine wave or square wave.
• Individual shutdown for each clock buffer to
  reduce extra power.
• 2.53.6V supply version voltage
• TDFN 12, 10 8 ( for 4, 3 2 output device
  respectively) package.

62
Silicon Oscillator Typical Application Diagram

• When an accurate clock is not necessary, silicon
  oscillator can clock several devices hence,
  perform clock distribution function

63
STCL1120

• STCL1120
• 12MHz silicon oscillator with Chip Enable
• Features
• 12MHz Square wave Output
• Operating voltage 4.5 5.5V
• Operating current 650µA _at_ 5V
• Stand-by current 2µA
• Fast and stable start-up 50µs (max)
• Frequency accuracy
• /- 1.5 Vcc 4.5 5.5V across temperature
  range
• Immunity to shocks
• Push-pull, CMOS compatible Frequency (Square
  Wave) output
• Chip Enable Input, active high
• Temperature range -20/85C
• Package SOT23-5L

• Applications
• Display Drivers
• Motor Control
• High shock and vibration environment
• White goods and household appliances
• Applications with multiple inputs sharing a
  common clock source

64
Silicon Oscillators vs. Ceramic Resonators

• Similar accuracy
• Smaller size
• Ten times faster start-up
• Purely silicon design immunity to shock and
  vibrations
• Available even at lowerfrequencies (32 KHz)
• Capability to drive multipleclock inputs
• No need for external components nor matching.

65
Example Application Diagram USB

• USB application clock with suspend function

66
32KHz Silicon Oscillator Vs Crystal
Ceramic resonators dont offer 32KHz frequencies
67
STCL132K

• 32,768Hz silicon oscillator with Chip Enable
• Silicon Oscillator Features
• 32,768Hz
• Operating voltage 1.6 3.6V
• Operating current 60µA _at_ 1.8V
• Stand-by current 1µA
• Fast and stable start-up 120µs (max)
• Frequency accuracy
• /- 1.0 _at_ 0/70OC Vcc 2.7 to 3.6V or 1.65 to
  1.95V
• /- 1.25 _at_ -30/85OC Vcc 2.7 to 3.6V or 1.65
  to 1.95V
• Immunity to shocks
• Push-pull, CMOS compatible Frequency (Square
  Wave) output
• Chip Enable Input, active high, internal 150kO
  pull-down
• Package SC70-5L

• Applications
• Display Drivers
• High shock and vibration environment
• Portable and battery powered equipment (PDAs,
  cellular phones)
• Applications with multiple inputs sharing a
  common clock source