PT8A974LP Datasheet, PDF (5/12 Pages) Pericom Semiconductor Corporation – 8-Function Remote Controller

Data Sheet
PT8A9701P/974P/974LP
8-Function Remote Controller
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Functional Description
Coding Method
In normal operation without ‘Turbo’, forward (backward) out-
put pin of the decoder PT8A974P/974LP sends out a 60Hz
signal. In operation with ‘Forward (Backward)’ and ‘Turbo’
combined, the output signal will be completely high. This func-
tion is depicted in Table 3.
Timing Diagram
Data Format
See Figure 4.
Each trigger pin is triggered by corresponding bit of data in
format of “1”. The data string is 16-bit and divided to four
segments, i.e., Start Code, Data Code, Parity Code and End
code, where
Start Code = 11110.
Data Code = F B T R L F1 F3 F4 F2
F = Forward
B = Backward
T = Turbo
R = Right
L = Left
F1= Function 1
F2 = Function 2 F3 = Function 3 F4 = Function4
Parity Code = Even parity check result
End Code is for data latch.
Data code can be any combination of F, B, T, R, L, F1, F2, F3
and F4 except F&B and R&L.
Table 3
Input to PT8A970P
Forward
Backward
Forward + Turbo
Backward + Turbo
Forward
60Hz
Low
High
Low
Output from PT8A974P/974LP
Backward
Low
60Hz
Low
High
Turbo
Low
Low
High
High
Figure 4. Data Format
"1"
Frequency: 500Hz, Duty Cycle: 3/4
"0"
Frequency: 500Hz, Duty Cycle: 1/4
PT0090(09/02)
5
Ver:2