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.