产品特点 Features

• Real time clock provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
• Low backup current while running: typical 100 nA at VDD = 2.0 V and Tamb = 25 ℃
• Resolution: seconds to years
• Watchdog functionality
• Freely programmable timer and alarm with interrupt capability
• Clock operating voltage: 1.1 V to 5.5 V
• 3 line SPI-bus with separate, but combinable data input and output
• Serial interface at VDD = 1.8 V to 5.5 V
• 1 second or 1 minute interrupt output
• Integrated oscillator load capacitors for CL = 7 pF
• Internal Power-On Reset (POR)
• Open-drain interrupt and clock output pins
• Programmable offset register for frequency adjustment

应用

• Time keeping application
• Battery powered devices
• Metering
• High duration timers
• Daily alarms
• Low standby power applications

功能框图