PCF85053ATKJ

PCF85053ATKJ is a bootable CPU RTC with two I2C buses, 128byte SRAM and alarm function. This CMOS real-time clock (RTC) and calendar optimized for low power consumption and automatic switching to battery on primary power loss. Featuring clock output, ALRT (interrupt) output and 128bytes of battery backup SRAM. The PCF85053A includes two I2C buses. The primary I2C bus has the read/write capability on RTC and SRAM registers. The second I2C bus also can read/write most registers with the control bits set by primary I2C controller. The PCF85053A offers clock output calibration-related registers such as crystal CL(capacitive load) configuration and offset register setting. Applications include server and computer precision timekeeping, network-powered and industrial electronics, products with long automated unattended operation time and white goods.

• Supply voltage range from 1.7V to 3.6V, battery supply voltage range from 1.55V to 3.6V
• Provides year, month, day, weekday, hours, minutes and seconds based on a 32.768KHz quartz crystal
• Device addresses (RTC: 1101 111, SRAM: 1010 111)
• Two independent I2C with speed 400KHz maximum
• I2C bus not active during battery switchover, real-time clock and calendar
• Align to MC146818B register definition for offset 0 to 09h, support both binary mode and BCD mode
• Support 24-hour and 12-hour mode, support daylight saving mode, interrupt flag support
• RTC-CLR flag, alarm flag, RTC fail flag, oscillator fail flag
• Battery-backed 128byte SRAM, SRAM clear to ‘0’ by RTC-CLR pin
• HVSON12 package, -40°C to +85°C temperature range