M41T94 is a low-power clock chip produced by ST company. Its main features are 44 bytes of NVRAM and reset function, as well as 32KHz crystal oscillator, ultra-low battery supply current, automatic switching and deselection circuit, programmable alarm and interrupt function, accurate programmable watchdog timer, microprocessor power-on reset, choice of power-fail deselect voltage, etc.
The M41T94 is a serial real-time clock with 44 bytes of non-volatile RAM and a reset output. It includes a built-in 32 kHz crystal oscillator and supports a Serial Peripheral Interface (SPI) for data transfer. The device features automatic power failure detection and switchover to a battery supply, ensuring continuous timekeeping.
| Operating Voltage | 2.7 to 5.5 V |
|---|---|
| Oscillator Frequency | 32 KHz |
| Interface | SPI (2 MHz) |
| Battery Supply Current | 500 nA (max) |
| NVRAM Size | 44 bytes |
| Watchdog Timer Range | 62.5 ms to 128 s |
The maximum battery supply current is 500 nA.
Yes, it has an accurate programmable watchdog timer ranging from 62.5 ms to 128 s.
The operating voltage range is 2.7 to 5.5 V.