Display Data Channel; Led - NEC FP1355 Service Manual

1.6.8

Display Data Channel

The DDC2B/2Bi function belongs to IC101 (microcomputer).
DDC2B: Immediately after the monitor power is turned ON, the microcomputer reads the EDID
data from IC104. It outputs the EDID data according to the clock input into pin 34 SCL-DDC.
DDC2Bi: The monitor adjusts the picture etc. corresponding to DDC2Bi command which is
input to pin 34 SCL-DDC and pin 35 SDA-DDC of microcomputer. This DDC2Bi command is
used for the adjustment operated at factory. In case general user uses this, he/she needs
specified application and adapter.
PIN# FUNCTION
1 DA0
2 DA1
3 DA2
4 DA3
5 DA4
6 DA5
7 DA6
8 DA7
9 DA8
10 VSSA
11 VDDA
12 PB7/AN7
13 PB6/AN6
14 PB5/AN5
15 PB4/AN4
16 PB3/AN3
17 PB2/AN2
18 PB1/AN1
19 PB0/VFBACK/AN0
20 VSYNCI1
21 PC7/VSYNCI2/ITD
22 PD6/CLAMPO
23 PD5/ITA
24 PD4/ITB
25 PD3/ITC
26 PD2/VSYNCO
27 PD1/HSYNCO
28 OD0/CSYNCI
1.6.9

LED

J102 pin 1 is connected to the anode of the green LED, J100 pin 2 is connected to the anode
of the amber LED, and pin 6 is connected to the cathodes of both. Since P_OFF_+5V is
normally supplied, the current flows to J102 pin 1 to turn OFF Q100. Therefore, any current
does not flow to J102 pin 2.
(The green LED only is lit.)
Since P_OFF_+5V is turned OFF in the power management mode, no current is not flowed to
J102 pin 1 to turn ON Q100. Therefore, the current flows to J102 pin 2. (The Orange LED only
is lit.)
Table 7 IC101 (MPU) Pin assignment
ASSIGNMENT PIN#
H/V-ADJ(D/A) 56
LIN(D/A) 55
ROTATION(D/A) 54
VCANCEL(D/A) 53
PWM-HEAT(D/A) 52
TL(D/A) 51
TR(D/A)
50
BL(D/A) 49
BR(D/A) 48
GND 47
+5V 46
KEY-4DIR(A/D) 45
KEY-PUSH(A/D) 44
THERM(A/D) 43
BEAM-TIME(A/D) 42
ABL(A/D) 41
X-PRO(A/D) 40
X-OUT(A/D) 39
Y-OUT(A/D) 38
V-SYNC(IN) 37
DEGAUSS(OUT) 36
CLP(OUT) 35
LOCK(IN) 34
LED(OUT) 33
SPARK(OUT) 32
VS-OUT(OUT) 31
HS-OUT(OUT) 30
G-SYNC(IN) 29
1 - 40
FUNCTION
VPP/TEST GND
IRIN GND
NOT(RESET) RESET(IN)
PA0 SEL(OUT)
PA1 DATA(OUT)
PA2 CLOCK(OUT)
PA3 HSK(OUT)
PA4 USB-RST(OUT)
PA5 INT-SUB(OUT)
PA6 NC
PA7/BLANKO WP(OUT)
OSCIN CRYSTAL-IN
OSCOUT CRYSTAL-OUT
USBVCC NC
USBDP NC
USBDM NC
USBGND GND
PC7/TDO(SCI) PRO1(IN)
PC6/RDI(SCI) SDA-I2C(IN)
PC5/SDAI(I2C) SDA-I2C(OUT)
PC4/SCLI(I2C) SCL-I2C(OUT)
PC3/SDAD(DDC) SDA-DDC(SIO)
PC2/SCLD(DDC)/RX SCL-DDC(SIO)
PCI/HSYNCI2 P-OFF(OUT)
PC0/OCMP/HFBACK P-SUS(OUT)
VDD +5V
HSYNCI1 H-SYNC(IN)
VSS GND
ASSIGNMENT