DS1307Z+
Overview
The DS1307Z+ is a low-power, full binary-coded decimal (BCD) clock/calendar with 56 bytes of NV SRAM. It manages all timekeeping functions including seconds, minutes, hours, date, month, day of the week, and leap-year compensation up to the year 2100. The device operates as a slave on the I2C serial interface and features a built-in power-sense circuit that detects power failures and automatically switches to the battery supply.
Why Choose This Part
The inclusion of 56 bytes of battery-backed RAM allows for the storage of critical system settings or status flags without needing an external EEPROM. Its automatic power-fail circuitry and low 500nA battery-mode current ensure long-term reliability using standard coin cell batteries. Additionally, the programmable square-wave output provides a convenient clock source for other system peripherals.
Applications
Key Specifications
Getting Started
Connect a 32.768kHz crystal to pins 1 and 2, and a 3V lithium cell to the V_BAT input to enable timekeeping during power-down. Use the I2C interface to communicate with the device at its fixed address; libraries such as RTClib are widely available for quick integration with MCU platforms. Note that pull-up resistors are required on the SDA and SCL lines for proper 5V operation.
Also Consider
NXP Semiconductors
