PCF8583PN Datasheet, PDF (1/37 Pages) NXP Semiconductors – Clock and calendar with 240 X 8-bit RAM

PCF8583
Clock and calendar with 240 x 8-bit RAM
Rev. 06 — 6 October 2010
Product data sheet
1. General description
The PCF8583 is a clock and calendar chip, based on a 2048 bit static CMOS¹ RAM
organized as 256 words by 8 bits. 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. Address pin A0 is used for
programming the hardware address, allowing the connection of two devices to the bus
without additional hardware.
The built-in 32.768 kHz oscillator circuit and the first 8 bytes of the RAM are used for the
clock, calendar, and counter functions. The next 8 bytes can be programmed as alarm
registers or used as free RAM space. The remaining 240 bytes are free RAM locations.
2. Features and benefits
„ I²C-bus interface operating supply voltage: 2.5 V to 6 V
„ Clock operating supply voltage 1.0 V to 6.0 V at 0 °C to +70 °C
„ 240 × 8-bit low-voltage RAM
„ Data retention voltage: 1.0 V to 6.0 V
„ Operating current (at f_SCL = 0 Hz): max 50 μA
„ Clock function with four year calendar
„ Universal timer with alarm and overflow indication
„ 24 hour or 12 hour format
„ 32.768 kHz or 50 Hz time base
„ Serial input and output bus (I²C-bus)
„ Automatic word address incrementing
„ Programmable alarm, timer, and interrupt function
„ Slave addresses: A1h or A3h for reading, A0h or A2h for writing
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 14.