DS1302 Trickle Charge Timekeeping Chip IC

DS1302 trickle-charge timekeeping chip consists of a real-time clock/calendar (RTC). It’s an 8-pin gadget that uses 31 bytes of battery-backed SRAM to display a full binary-coded decimal (BCD). Address and data are serially transmitted in this IC over an I2C bidirectional bus. On the I2C bus, the DS1302 acts as a slave device. The DS1302 is a low-power clock that provides certified data for seconds, minutes, hours, days, dates, months, and years. It automatically modifies the end date of each month, particularly for months with less than 31 days, taking into account leap year corrections. The clock has an AM/PM indicator and works in either a 24-hour or 12-hour mode.

Using synchronous serial connection to connect the DS1302 to a microprocessor simplifies the operation. To connect with the clock/RAM, only three wires are required: CE, I/O (data line), and SCLK (serial clock). Data is frequently sent 1 byte at a time to and from the clock/RAM, or in bursts of up to 31 bytes. The DS1302 is designed to operate on very low power and preserve data and clock information while consuming less than 1W.

The successor of the DS1202 is the DS1302. The DS1302 has dual power pins for primary and backup power supply, a programmable trickle charger for VCC1, and 7 additional bytes of scratchpad memory in addition to the core timekeeping functionality of the DS1202. Even if there is a power outage, the DS1302 RTC has a battery backup capability that keeps the clock ticking. RTCs can be found in a variety of applications, including embedded devices and computer motherboards.