I2C™ Real-Time Clock/Calendar Low cost and feature rich, with memory and battery switchover M i c r o c h i p T e c h n o l o g y I n c o r p o r a t e d Pin Functions Name Pin Pin Functions X1 1 Xtal/Input X2 2 Xtal/Output VBAT 3 Battery Backup VSS 4 Ground SDA 5 Serial Data I/O SCL 6 Serial Clock MFP 7 Interrupt*/Clock Output VCC 8 Supply Voltage ¡ As crystal frequency drifts, would you like to keep accurate time by loading a calibration value? ¡ If system power is lost, would you like to know how long power has been off? ¡ Do you have size and cost constraints that would benefi t from the embedded memory? ¡ Is your MAC Address programming ineffi cient and could benefi t from a preprogrammed device? Ordering Information Block Diagram MCP7941X Features ¡ Real-Time Clock/Calendar (RTCC) – Alarm counter down to the second – Programmable alarm or clock output – Digital trimming for higher accuracy ¡ User Memory – Battery-backed SRAM: 64 bytes – EEPROM: 1 Kbit – Unique ID: 64 bits of protected EEPROM ¡ Low Power – Minimum operating and backup voltages: VCC = 1.8V, VBAT = 1.3V – Typical operating and backup currents: ICC < 400 ìA @ 3V IBAT < 700 nA @ 1.8V – Battery Switchover with Timestamp ¡ Industry-Standard Pinout – 8-pin packages

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