Iic Bus D/A Converter (Fan Control, Ic7881) - Panasonic PT-CW230E Service Manual

Control Port Functions

IIC bus D/A converter (Fan control, IC7881)

PIN NO. FUNCTION NAME
1 Reset Input
2 IIC BUS SCL
3 IIC BUS SDA
4 FAN_CONT5
5 FAN_CONT6
6
7
8 GND
9 DAC Upper Ref. Voltage(CH5~CH8)
10 GND
11 DAC Upper Ref. Voltage (CH1~CH4)
12 FAN_CONT1
13 FAN_CONT2
14 FAN_CONT3
15 FAN_CONT4
16 Power for Output Buffer (4.5V ~ 5.5V)
17 Power Supply +5V±10%
18 Slave Address Setting Pin2 (Vdd)
19 Slave Address Setting Pin1 (Vdd)
20 Slave Address Setting Pin0 (Vdd)
FUNCTION
FN905 Control Voltage (Power Box Exhaust Fan)
FN906 Control Voltage (Color Wheel Intake Fan)
FAN_FN902 Control Voltage (PBS Cooling)
FN901 Control Voltage (Intake Fan)
FN902 Control Voltage (Lamp Intake Fan Top)
FN903 Control Voltage (Lamp Intake Fan Bottom
FN904 Control Voltage (Lamp Exhaust Fan)
-49-
ACTION
POL.
Stand-by Power On
I ->
I ->
I/O ->
AO -> 0:FAN Max ~ 255:FAN Min
AO -> 0:FAN Max ~ 255:FAN Min
->
AO -> 0:FAN Max ~ 255:FAN Min
- ->
- ->
- ->
- ->
AO -> 0:FAN Max ~ 255:FAN Min
AO -> 0:FAN Max ~ 255:FAN Min
AO -> 0:FAN Max ~ 255:FAN Min
AO -> 0:FAN Max ~ 255:FAN Min
- ->
- ->
I -> H
I -> H
I -> H