AN1500A

PDS038-SA2532K-001

Rev. C

21-03-00

This application note describes the use of the SA2532K Single Chip Telephone IC developed specifically to meet

with India’s Department of Telecommunication (DOT) Specification for the Electronic Telephone Instruments. This

application note is based on the use of the multi-purpose demo board DB1500I with the SA2532K IC

• High performance telephone with speech circuit, DTMF/Pulse dialer and tone ringer

• Very few external low cost components

• CMOS technology, far less sensitive to EMC

• EMC proof single sided layout, provision for EMC blocking capacitors installed

• Internally set real AC impedance to reduce external components

• Sidetone programmable by two resistors and one capacitor

• Ring frequency discrimination

• Line loss compensation selectable by jumper

• 2 different flash timings selectable by 2 flash keys

• 31 digit last number redial

• Sliding cursor protocol and pause key

• One-touch repeat dialing

• 1 direct memory

• Tone / Pulse switch

• Modular connectors for handset and line cord, line connector a/b- terminals selectable by jumper

• Layout prepared for 16kHz blocking filters

• 19-key SPST Keyboard on board

• Tone LED output Indicator

• Several hook transistor configurations

• Over-voltage and over-current circuit options

sames

sames

sames

sames

AN1500A

APPLICATION NOTE

SINGLE CHIP TELEPHONE DEMO BOARD

SA2532K

1 Scope

2 Key Features