The PT7C4337WEX is an integrated Real Time Clock (RTC) with Ultra Low Power I2C Bus- Compatible Interface manufactured by Diodes Incorporated. The device has an integrated oscillator and requires no external components to maintain time and date functions. It also has a trickle charger in order to maintain the capacitor that keeps the clock ticking, even when the system is powered down. The RTC data is formatted in binary-coded decimal (BCD) format.The PT7C4337WEX features a wide operating temperature range from -40°C to +85°C, programmable frequency output from 0.3Hz to 8Hz, and is packaged in a tiny 6-pin SOT-23 package. Other features include a built-in low-power comparator, an alarm, a battery backup, and an integrated extra I/O pin that can be used to power the oscillator from an external source, which helps reduce power consumption.