Saa3010T - Hitachi 22LD4200UK Service Manual

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
1 X7 (IPU)
2 SSM (I)
3 Z0-Z3 (IPU)
7 MDATA (OP3)
8 DATA (OP3)
9-13 DR7-DR3 (ODN)
14 VSS
15-17 DR-2-DR0 (ODN)
18 OSC (I)
19 TP2 (I)
20 TP1 (I)
21-27 X0-X6 (IPU)
28 VDD(I)
Note:
(I): Input,
(IPU): input with p-channel pull-up transistor,
(ODN): output with open drain n-channel transistor
(OD3): output 3-state
22" TFT TV Service Manual
Function
Sense input from key matrix
Sense mode selection input
Sense inputs from key matrix
Generated output data modulated with 1/12 the oscillator frequency at a 25%
duty factor
Generated output information
Scan drivers
Ground (0V)
Scan drivers
Oscillator input
Test point 2
Test point 1
Sense inputs from key matrix
Voltage supply
18