SAN3010 Datasheet, PDF (1/13 Pages) Sames – SINGLE CHIP TELEPHONE INTERFACE FOR KEYBOARD ENTRY VIA uC

sames
SAN3010
APPLICATION NOTE
SINGLE CHIP TELEPHONE INTERFACE FOR
KEYBOARD ENTRY VIA uC
1 Scope
This application note describes a simple interface for keyboard entry to the SA253x family via a Microcontroller. It
also includes hardware description , flowchart and a software example based on the 80Cxx - family of
Microcontrollers.
2 Key Features
• only 5 outputs and 1 input required from µC for handshake to access all keys in the SA253x keyboard matrix
• universal interface, not restricted to specific Microcontrollers
• supports both 3V- and 5V- µCs
• same hardware for all single chip telephones : SA2531/2
• same software for all single chip telephones, only key labels must be replaced
Table of Contents
1 SCOPE.............................................................................................................................................................................................................1
2 KEY FEATURES ..............................................................................................................................................................................................1
3 OTHER APPLICABLE DOCUMENTS AND PAPERS ......................................................................................................................................1
4 REVISION STATUS .........................................................................................................................................................................................2
5 GENERAL DESCRIPTION ...............................................................................................................................................................................2
6 HARDWARE CONFIGURATION ......................................................................................................................................................................2
7 APPLICATION SCHEMATIC:...........................................................................................................................................................................2
8 SCANNING TABLE/FLOWCHART...................................................................................................................................................................3
9 SAMPLE SOFTWARE......................................................................................................................................................................................3
10 KEY ENTRY SIGNAL TABLE: .......................................................................................................................................................................4
11 APPENDIX A: APPLICATION SCHEMATIC ..................................................................................................................................................5
12 APPENDIX B: FLOWCHART: ........................................................................................................................................................................6
13 APPENDIX C: SAMPLE SOFTWARE LISTING .............................................................................................................................................7
14 LIABILITY AND COPYRIGHT STATEMENT ................................................................................................................................................13
3 Other applicable documents and papers
1. Data Sheet SA2531, SA2532
2. Pin-out Comparison SA2531/2
3. Product Presentation
4. Single Chip Telephone Evolution (Apr. 16, 1996)
SAN3010
PDS038-SA2531/2-003 Rev. B 21-03-00