OVERVIEW

The SM8211M is a POCSAG-standard (Post Office Code Standardization Advisory Group) signal processor LSI, which conforms to CCIR recommendation 584 concerning standard international wireless calling codes.

The SM8211M supports call messages in either tone, numerical or character outputs at signal speeds of 512 bps or 1200 bps using a 76.8 kHz system clock, or 2400 bps using a double-speed 153.6 kHz system clock. Note that output timing values for 2400 bps mode operation are not shown in this datasheet, but can be obtained by halving the values for 1200 bps mode operation.

FEATURES

■ Conforms to POCSAG standard for pagers

■ 512 or 1200 bps signal speed

■ Supports tone, numeric or character call messages

■ Battery-saving function for low battery consumption

■ BS1 (RF control main output signal) and BS3 (PLL setup signal) 60-step setup time setting—for BS3, 50.8 ms (max) at 1200 bps and 119.1 ms (max) at 512 bps

   Note that (BS3 setup time) − (BS1 setup time) should be set to ≥ 2.

■ BS2 (RF DC-level adjustment signal) before/during reception selectable adjustment timing

■ 6 addresses × 4 sub-addresses (total of 24 addresses)

■ 1-bit and 2-bit burst error auto-correction function (messages only)

■ 25 to 75% duty factor signal coverage (during pre amble detection)

■ 8 rate error detection condition settings

■ 8 receive mode settings

■ 76.8 or 153.6 kHz system clock (crystal oscillator or external clock input)

■ Built-in oscillator capacitor

■ Built-in input signal filter, with filter ON/OFF and 4 selectable filter characteristics

■ 1.2 to 3.5 V (76.8 kHz system clock) or 2.0 to 3.5 V (153.6 kHz system clock) operating supply voltage

■ Molybdenum-gate CMOS process realizes low power dissipation

■ 20-pin SSOP