M41T0 is a serial real-time clock produced by ST company, which has counters for seconds, minutes, hours, day, date, month, years, and century, 32KHz crystal oscillator, I2C bus interface, low standby current, 2.0-5.5V clock operating voltage, special software programmable output and other features.
The M41T0 is a low power serial real-time clock supplied in an 8-lead plastic small outline package (SO8). It features a built-in 32.768 kHz oscillator controlled by an external crystal, providing exceptional stability and high series resistance operation. The device includes counters for seconds, minutes, hours, day, date, month, years, and century.
| Operating voltage | 2.0 to 5.5 V |
|---|---|
| Standby current | 0.9 µA typical at 3 V |
| Operating temperature | -40 to 85 °C |
| Oscillator frequency | 32.768 kHz |
The device operates as a slave on the serial bus with the correct slave address of 0h.
Eight registers are used for the clock/calendar function, configured in binary coded decimal (BCD) format.