Description

The AS2525 is a very flexible CMOS mixed-mode integrated circuit for use in feature phones, answering machines and fax machines. It contains an analogue line interface and speech circuit for a/b terminals, loudhearing, handsfree, enhanced LD/MF dialler, tone ringer with DC-DC converter and serial interface to EEPROM and LCD-driver (AS2591), all in a 44 pin package. The circuit is fully line powered.

The AS2525 uses an external EEPROM for a 32 digit last number redial storage and memories for 28 numbers each containing up to 24 digits/data.

The device provides a volume control for the earpiece andnthe loudspeaker. The volume can be controlled by pressingnthe [V-]/[V+] keys.

The versatility of the circuit is provided by programming allnparameters through an external EEPROM. This allows easy adaptation to various PTT requirements worldwide.