Teac TFT IDTV, Service Manual

Page: 22 / 78

18
22” TFT TV Service Manual 13/10/2004
11.16. SAA3010T
11.16.1. Description
The SAA3010 is intended as a general purpose (RC-5) infrared remote control system for use where a low
voltage supply and a large debounce time are expected.
The device can generate 2048 different commands and
utilizes a keyboard with a single pole switch for each key. The commands are arranged so that 32 systems can
be addressed, each system containing 64 different commands. The circuit response to legal (one key pressed at
a time) and illegal (more than one key pressed at a time) keyboard operation is specified in the section
“Keyboard operation”.
11.16.2. Features
•
Low voltage requirement
•
Biphase transmission technique
•
Single pin oscillator
• Test mode facility
11.16.3. Pinning
Pin Mnemonic Function
1 X7 (IPU) Sense input from key matrix
2 SSM (I) Sense mode selection input
3 Z0-Z3 (IPU) Sense inputs from key matrix
7 MDATA (OP3) Generated output data modulated with 1/12 the oscillator frequency at a 25%
duty factor
8 DATA (OP3) Generated output information
9-13 DR7-DR3 (ODN) Scan drivers
14 VSS Ground (0V)
15-17 DR-2-DR0 (ODN) Scan drivers
18 OSC (I) Oscillator input
19 TP2 (I) Test point 2
20 TP1 (I) Test point 1
21-27 X0-X6 (IPU) Sense inputs from key matrix
28 VDD(I) Voltage supply
Note:
(I): Input,
(IPU): input with p-channel pull-up transistor,
(ODN): output with open drain n-channel transistor
(OD3): output 3-state