GENERAL DESCRIPTION

The PCF8593 is a CMOS clock/calendar circuit, optimized for low power consumption. Addresses and data are transferred serially via the two-line bidirectional I2C-bus. The built-in word address register is incremented

automatically after each written or read data byte. The built-in 32.768 kHz oscillator circuit and the first 8 bytes of RAM are used for the clock/calendar and counter functions. The next 8 bytes may be programmed as alarm registers or used as free RAM space.

FEATURES

• I2C-bus interface operating supply voltage: 2.5 to 6.0 V

• Clock operating supply voltage (Tamb = 0 to +70 °C):

1.0 to 6.0 V

• 8 bytes scratchpad RAM (when alarm not used)

• Data retention voltage: 1.0 to 6.0 V

• External RESET input resets I2C interface (only)

• Operating current (fscl = 0 Hz, 32 kHz time base,

VDD = 2.0 V): typ. 1 µA

• Clock function with four year calendar

• Universal timer with alarm and overflow indication

• 24 or 12 hour format

• 32.768 kHz or 50 Hz time base

• Serial input/output bus (I2C-bus)

• Automatic word address incrementing

• Programmable alarm, timer and interrupt function

• Space-saving SO8 package available

• Slave address:

– READ A3

– WRITE A2.