Features and benefits
• Voltage range addresses common supply rails
– VDD supply voltage from 1.7 V to 3.6 V
– VBAT battery supply voltage from 1.55 V to 3.6 V
• Two independent I2C interfaces with up to 400 kHz speed
– Primary I2C bus with Read/write capability on RTC and SRAM registers
– Secondary I2C bus with read/write capability on RTC and SRAM registers enabled by primary I2C
– Both I2C interface supports clock timeout of 35 ms max
• Crystal compatibility & accuracy
– Quartz oscillator circuit with integrated load capacitors (no external capacitors required)
– Configurable: CL = 6 pF, CL = 7 pF, or CL = 12.5 pF
– Time accuracy adjustment via programmable offset register
• RTC feature set
– Aligns with MC146818B register definition for server applications
– Active low ALRT (interrupt) output
– Automatic timestamp and random code generation
– Supports binary/BCD mode, 24-hr/12-hr mode and daylight savings mode
– Battery-backed 128 byte SRAM
– SRAM clear by RTC_CLR pin
– Dedicated I2C addresses for RTC and SRAM
• Package
– HVSON12; 3 mm x 3 mm x 0.85 mm body, 0.5 mm pitch
– Ambient operating temperature from -40 °C to +85 °C
Applications
• Server and computer precision timekeeping
• Network-powered and industrial electronics
• Products with long automated unattended operation time
• White goods
• Servers with a bootable CPU
• Systems with dual I2C architecture