Device identity and I2C RTC function
The NXP PCF8593T/1,118 is a Clock/Calendar real-time clock (RTC) that communicates over an I2C, 2-Wire Serial interface — the standard bus for microcontrollers that already have an I2C peripheral, so no extra GPIO bit-banging is needed. It tracks time in both 12-hour and 24-hour formats with a YY-MM-DD-dd date format, and includes a programmable alarm and 8 bytes of NVSRAM for storing configuration or event flags that survive a power loss.
Timekeeping current and battery-life consideration
Timekeeping current is 8 µA to 15 µA at 2 V to 5 V — at the low end, a 220 mAh CR2032 coin cell would theoretically power the RTC for over 1.5 years before depletion, though real battery life depends on the alarm duty cycle and I2C bus activity.
Package and board integration
Housed in an 8-SOIC package (3.90 mm width, 0.154" pitch), it fits standard surface-mount assembly lines and reflow profiles. The supplier device package is 8-SO, consistent with the SOIC-8 footprint common on two-layer boards. Available in Tape & Reel (TR) or Cut Tape (CT) — the reel option suits automated pick-and-place for volume production; cut tape works for prototype runs.
Lifecycle and compliance status
RoHS3 compliant (2011/65/EU + 2015/863), with no exemptions — no lead, mercury, or other restricted substances in the package or die attach.