GENERAL DESCRIPTION

The PCD5003A is a very low power POCSAG decoder and pager controller. It supports data rates of 512, 1200 and 2400 bits/s using a single 76.8 kHz crystal. On-chip EEPROM is programmable using a minimum supply voltage of 2.0 V, allowing ‘over-the-air’ programming. The PCD5003A is fast I2C-bus compatible (maximum 400 kbits/s).

FEATURES

? Wide operating supply voltage range: 1.5 to 6.0 V

? EEPROM programming requires only 2.0 V supply

? Low operating current: 50 μA typ. (ON), 25 μA typ. (OFF)

? Temperature range: ?25 to +70 °C

? “CCIR Radio paging Code No. 1” (POCSAG) compatible

? 512, 1200 and 2400 bits/s data rates using 76.8 kHz crystal

? Built-in data filter (16-times oversampling) and bit clock recovery

? Advanced ACCESS? synchronization algorithm

? 2-bit random and (optional) 4-bit burst error correction

? Up to 6 user addresses Receiver Identity Codes (RICs), each with 4 functions/alert cadences

? Up to 6 user address frames, independently programmable

? Optional automatic call termination when bit error rate is high

? Standard POCSAG sync word, plus up to 4 user programmable sync words

? Received data inversion (optional)

? Call alert via beeper, vibrator or LED

? 2-level acoustic alert using single external transistor

? Alert control: automatic (POCSAG type), via cadence register or alert input pin

? Separate power control of receiver and RF-oscillator for battery economy

? Dedicated pin for easy control of superheterodyne receiver

? Synthesizer set-up and control interface (3-line serial)

? On-chip EEPROM for storage of user addresses (RICs), pager configuration and synthesizer data

? On-chip SRAM buffer for message data

? Slave I2C-bus interface to microcontroller for transfer of message data, status/control and EEPROM programming (data transfer at up to 400 kbits/s)

? Wake-up interrupt for microcontroller, programmable polarity

? Direct and I2C-bus control of operating status (ON/OFF)

? Battery-low indication (external detector)

? Out-of-range condition indication

? Real-time clock reference output

? On-chip voltage doubler

? Interfaces directly to UAA2080 and UAA2082 paging receivers.

APPLICATIONS

? Display pagers, basic alert-only pagers

? Information services

? Personal organizers

? Telepoint

? Telemetry/data transmission.