Sharp R-7H55 - Page 24

22
R-7H55
Pin No. Signal I/O Description
19 AVSS IN Reference voltage input terminal.
A reference voltage apllied to the A/D converter in the LSI. T he reference voltage is
generally maintaned at -5V.
20 AN0 IN Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the themistor, this
input is converted into temperature by the A/D converter built into the LSI.
21 AN1 IN AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
22 AN2 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an
analog input terminal from the AH sensor circuit, and connected to the A/D converter built
into the LSI.
23-27 AN3-AN7 OUT Used for initial balancing of the bridge circuit(absolute humidity sensor)
28 AN8 IN Connected to GND.
29-31 AN9-AN11 IN Heating constant compensation terminal.
32/33 AVCC/VCC IN/IN Connected to GND.
34 INT1 IN Signal synchronized with commercial source frequency(50Hz).
This is basic timing for time processing of LSI.
35 D1 OUT Segment data signals.
The relation between signals and indicators are as follows:
Signal ..... segment Signal .....segment
D1 ................... UB R91 ......................f
D9 ...................... k R92 .....................g
R80 .................... a R93...................... j
R81 .................... b R10.....................p
R82 .................... c R11 .....................h
R83 .................... d R12.....................n
R90 .................... e R13.................. LB
Refer to the touch control panel circuit for the relationship between signals and
indicators. Normally, one pulse is output in every synchronized signal (ß) period, and
input to the anode of the fluorescent display.
36 D2 OUT Digit selection signal.
The relationship between digit signal and digit are as
follows:
Digit signal Digit
D2 ............................ 1st.
D4 ........................... 2nd.
D5 ............................ 3rd.
D6 ............................ 4th.
D7 ............................ 5th.
D8 ............................ 6th.
Refer to the touch control panel circuit about the
relation between signals and digits. Normally, one
pulse is output in every synchronized signal (ß)
period, and input to the grid of the fluorescent display.
37 D3 OUT Signal to sound buzzer.
A: key touch sound(0.12sec.).
B: Completion sound(2.4sec.).
38-42 D4-D8 OUT Digit selection signals.
Signal similar to D2.
43 D9 OUT Segment data signals.
Signal similar to D1.
ß(50Hz)
GND
VP
(D12)
(ß : INTO signal)
H
L
GND
VP
ß(50Hz)
D2
D4
D5
D6
D7
D8
(ß : INTO signal)