NAD C 720BEE Service Manual page 11

uPC1237HA
MAIN BOARD: IC44
1
Overload Detector
2 Output Offset Detector
5
GND
AT24C64A
KEY BOARD: IC705
PIN CONFIGURATION
A0
A1
A2
GND
WP
Vcc
GND
SCL
SDA
A2
A1
A0
Din
ICS BLOCK DIAGRAM
Switch for latch/automatic --reset
3
1 8 VCC
2 7 WP
3 6 SCL
4 5 SDA
START
STOP
LOGIC
SERIAL CONTROL LOGIC
LOAD
COMP
DEVICE
ADRRESS
COMPARATOR
LOAD
DATA WORD
R/W
ADRR/COUNTER
Dout
- 11 -
7
VCC ON
MUTE
AC---OFF detector
4
FUNCTION
PIN NAME
A0--A2
ADDRESS INPUTS
SDA
SERIAL DATA
SCL
SERIAL CLOCK INPUT
WP
WRITE PROTECT
EN
H.V. PUMP/TIMING
DATA RECOVERY
INC
SERIAL MUX
Y DEC
VCC
8
EEPROM
Dout/ACK
LOGIC
6