M41T64:Low-power serial real-time clock (RTC) with alarm
The M41T6x is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator. Eight registers are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional eight registers provide status/control of alarm, 32 KHz output, calibration, and watchdog functions. Addresses and data are transferred serially via a two-line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts (M41T62/65), 32 KHz output (M41T62/64), programmable square wave output (M41T62/64), and watchdog output (M41T65). 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 M41T6x is supplied in two very small packages: a tiny, 3 x 3 mm 16-pin QFN which requires a user-supplied 32 KHz crystal, and an ultra-small 1.5 x 3.2 mm LCC with embedded crystal - no external crystal is required.
Key Features
- Serial real-time clock (RTC) with alarm functions
- 400 kHz I2
C serial interface
- Memory mapped registers for seconds, minutes, hours, day, date, month, year, and century
- Tenths/hundredths of seconds register
- 350 nA timekeeping current at 3 V
- Timekeeping down to 1.0 V
- 1.3 V to 4.4 V I2
C bus operating voltage
- 4.4 V max VCC
suitable for lithium-ion battery operation
- Low operating current of 35 μA (at 400 kHz I2
C speed)
- 32 KHz square wave output is on at power-up. Suitable for driving a microcontroller in low-power mode. Can be disabled. (M41T62/64)
- Programmable 1 Hz to 32 KHz square wave output (M41T62/64)
- Programmable alarm with interrupt function (M41T62/65)
- 32 KHz crystal oscillator integrates crystal load capacitors, works with high series resistance crystals
- Oscillator stop detection monitors clock operation
- Accurate programmable watchdog
- 62.5 ms to 31 min timeout
- Software clock calibration. Can adjust timekeeping to within ±2 parts per million (±5 seconds per month)
- Automatic leap year compensation
- –40 to +85 °C operation
- Two package options:
- Very small 3 x 3 mm, lead-free & halogen-free (ECOPACK2®
) 16-lead QFN
- Ultra-small 1.5 x 3.2 mm, lead-free & halogen-free (ECOPACK2®
) 8-pin ceramic leadless chip carrier with embedded 32 KHz crystal - no external oscillator components required (M41T62)
Product Specifications
Application Notes
Brochures
Clocks and Timers Software
Sample & Buy
Part Number | Package | Packing Type | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | Unit Price (US$)
* | Quantity | NVRAM size (B) | ECCN (EU) | ECCN (US) | Country of Origin |
---|
M41T64Q6F | VFQFPN 16 3x3x0.9 | Tape And Reel | -40 | 85 | 0.823 | 1000 | - | NEC | EAR99 | MALAYSIA |
Quality & Reliability
Part Number | Package | Grade | RoHS Compliance Grade | Material Declaration** |
---|
M41T64Q6F | VFQFPN 16 3x3x0.9 | Industrial | Ecopack2 | |