The DS1904 RTC iButton is an electronic tag with real-time clock/calendar function, which uses binary format to store time/date information, the clock accuracy is better than ± 2 minutes per month (25°C), the working temperature range is -40°C to +70°C, and the service life exceeds 10 years.
The DS1904 RTC iButton is a rugged real-time clock module that utilizes a 32.768 kHz crystal oscillator and a 32-bit binary counter. It features a unique 64-bit factory-lasered ROM and operates using the 1-Wire protocol, requiring only a single data lead and a ground return for communication.
| Clock accuracy | better than + 2 minutes per month at 25°C |
|---|---|
| Operating temperature range | -40°C to +70°C |
| Operation life | Over 10 years |
| ROM size | 64-bit |
| Data rate | 16.3k bits per second |
| Oscillator frequency | 32.768 kHz |
| Counter capacity | 136 years |
The clock accuracy is better than + 2 minutes per month at 25°C.
It communicates via a single digital signal using the 1-Wire protocol at 16.3k bits per second.
The device operates from -40°C to +70°C.