M41T93ZQA6F Real-Time Clock (RTC) ICs by STMicroelectronics

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

Status: Active
Series: M41T93
RoHS: Compliant
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The M41T93 is a low-power serial SPI bus real-time clock (RTC) 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.

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Prices starting from US$3.48

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Features

Ultra-low battery supply current of 365 nA
Factory calibrated accuracy ±5 ppm typical after 2 reflows (SOX18) (much better accuracies are 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; M41T93R: VCC= 2.7 V to 5.5 V; M41T93Z: VCC= 2.38 V to 5.50 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 supercapacitor backup
Operating temperature of –40 °C to +85 °C
Package options include a 16-lead QFN and an 18-lead embedded crystal SOIC

Last 6 months Inventory & Pricing History

Resources

Application Notes
AN3060 Applications guide for serial real-time clocks (RTCs)
AN1011 Battery technology used in NVRAM and real-time clock (RTC) products from ST
AN2678 Extremely accurate timekeeping over temperature using adaptive calibration
AN934 How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
AN1216 Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)
AN4641 Integrating TIMEKEEPER® and real-time clock supervisor functions
AN923 Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs
AN1572 Power-down time-stamp function in serial real-time clocks (RTCs)
AN1336 Power-fail comparator for NVRAM supervisory devices
AN1012 Predicting the battery life and data retention period of NVRAMs and serial RTCs
AN2971 Using the typical temperature characteristics of 32 KHz crystal to compensate the M41T83 and M41T93 serial real-time clocks

Alternative Descriptions

Rtc, -40 To 85Deg C | Newark Electronics
RTC, -40 TO 85DEG C | element14
RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Serial, SPI, 2.38V to 5.5V, QFN-16 | Avnet Silica
M41T93 Series 5.5 V Serial SPI Bus RTC With Battery Switchover-QFN-16 | Future Electronics

Frequently Asked Questions

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What category does M41T93ZQA6F fall under?

The M41T93ZQA6F is listed under Clocks and Timers > Real-Time Clock (RTC) ICs > RTC - Serial Interface.

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Is the M41T93ZQA6F RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

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