M41T0 Serial SPI bus real-time clock (RTC) with battery switchover

The M41T93 is a low-power serial SPI bus real-time clock with a built-in 32.768 kHz oscillator (external crystal-controlled for the QFN16 package, and embedded crystal for the SOX18 package). Eight bytes of the register map are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 17 bytes of the register map provide status/control of the two alarms, watchdog, 8-bit counter, and square wave functions. An additional seven bytes are made available as user SRAM.

Addresses and data are transferred serially via a serial SPI bus-compatible interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T93 has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the clock operations can be supplied by a small lithium button battery when a power failure occurs.

Functions available to the user include a non-volatile, time-of-day clock/calendar, alarm interrupt, watchdog timer, programmable 8-bit counter, and square wave outputs. The eight clock address locations contain the century, year, month, date, day, hour, minute, second, and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28, 29 (leap year), 30, and 31 day months are made automatically. The M41T93 is supplied in either a QFN16 or an SOX18, 300 mil SOIC which includes an embedded 32 KHz crystal. The SOX18 package requires only a user-supplied battery to provide non-volatile operation.

技术特性

Ultra-low battery supply current of 365 nA
Factory calibrated accuracy ±5 ppm guaranteed after 2 reflows (SOX18)
- Much better accuracies achievable using built-in programmable analog and digital calibration circuits
2.0 V to 5.5 V clock operating voltage
Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
Automatic switchover and reset output circuitry (fixed reference)
- M41T93S: VCC= 3.0 V to 5.5 V (2.85 V ≤ VRST≤ 3.00 V)
- M41T93R: VCC= 2.7 V to 5.5 V (2.55 V ≤ VRST≤ 2.70 V)
- M41T93Z: VCC= 2.38 V to 5.50 V (2.25 V ≤ VRST≤ 2.38 V)
Compatible with SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0])
Programmable alarm with interrupt function (valid even during battery backup mode)
Optional 2ndprogrammable alarm available
Square wave output (defaults to 32 KHz on power-up)
RESET (RST) output
Watchdog timer
Programmable 8-bit counter/timer
7 bytes of battery-backed user SRAM
Battery low flag
Low operating current of 80 μA
Oscillator stop detection
Battery or SuperCap™ backup
Operating temperature of –40 °C to +85 °C
Package options include:
- a 16-lead QFN or an 18-lead embedded crystal SOIC
RoHS compliance: lead-free components are compliant with the RoHS directive

功能框图

M41T0 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
M41T93ZMY6F	Active			SO-18	Tape And Reel	-40 °C-85°C	M41T93ZMY6F
M41T93ZQA6F	Active			VFQFPN 16 4x4x1.0	Tape And Reel	-40 °C-85°C	M41T93ZQA6F
M41T93SQA6F	Active			VFQFPN 16 4x4x1.0	Tape And Reel	-40 °C-85°C	M41T93SQA6F
M41T93RMY6F	Active			SO-18	Tape And Reel	-40 °C-85°C	M41T93RMY6F
M41T93RQA6F	Active			VFQFPN 16 4x4x1.0	Tape And Reel	-40 °C-85°C	M41T93RQA6F
M41T93SMY6F	Active			SO-18	Tape And Reel	-40 °C-85°C	M41T93SMY6F

DATASHEET

描述	版本	大小
M41T0 : DS2166: Serial real-time clock with 44 bytes NVRAM and reset	6	344KB

APPLICATION NOTES

描述	版本	大小
AN922: Using a Super Cap to back up the M41T56, M41T00, M41T11, M41T81, M41T94, and M41ST84W (16-pin)	2	85KB
AN1012: Predicting the battery life and data retention period of NVRAMs and serial RTCs	4	440KB
AN1572: Power-down time-stamp function in serial real-time clocks (RTCs)	2	172KB
AN1216: Implementing a periodic alarm with TIMEKEEPER®	1	55KB
AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products	4	124KB
AN1011: Battery technology used in NVRAM and real-time clock (RTC) products from ST	4	249KB
AN3060: Applications guide for serial real-time clocks	1	355KB

USER MANUALS

描述	版本	大小
UM0402 : Single-phase multi tariff energy meter	1	588KB