JUZITAO 6PCS DS3231 Real Time Clock Module RTC Sensor High Precision AT24C32 IIC Timer Alarm Clock for Raspberry Pi(Without Battery)+ 20 PCS Male to Female Jumper Wire

DS3231 AT24C32 Clock Module Real Time Clock Module Working voltage: 3.3V -- 5.5V, Clock chip: high-precision clock chip DS3231M, Memory chips: AT24C32 An interesting feature of DS3231 RTC IC is that it has integrated crystal oscillator and temperature sensor and hence you don’t have to connect an external crystal. You need prepare CR-2032 or LI-R-2032 battery since it is not included in this product. Provides two configurable alarm clock and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, provide a reset output. In addition, RST pin is monitored as generating a μP reset.