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2-7. IC91 1 (MSM6524GS)
IC91 1 (MSM6524GS) is a serial input IC which consists of a
96-bit EEPROM and a 1 2 - channel D/A converter. It
converts non - volatile data which is stored in the EEPROM
into analogue voltages and outputs these voltages.
IC91 1 (MSM6524GS) has an auto load function that
automatically loads the whole contents of the EEPROM and
automatically sets the D/A converter output when the power
is turned ON.
CLK
Clock control
C\I
0 0 0 0 0 0 0 0 0 0 0 0
< < < < < < < < < < < <
8-BIT shift register
3 STATE
8-BIT
1 2 LATCH
x
8-BIT D/A x 1 2
1 2 BUFFER
0
M
�
�
�
�
m
m
�
Fig. 2-1 6. IC91 1 Block Diagram
During adjustment, IC91 1 (MSM6524GS) communicates
with the service adjustment controller. The block diagram
and pin functions are shown in Fig . 2 - 1 6 and Table 2-5
respectively.
DO
DO output
Command
control
decoder
DA data latch
.�
""
w
"5.
�
IU
E
II>
en
"'
�
c:
C')
8- BIT x 1 2
II>
"'
EE PROM
Address
generation
circuit
AUTO LOAD
control
C\I
- 4 - 2 1 -
Command
control
POC
IC91 1
MSM6524GS
LOAD
TST 1
TST 2
VDD
GND
VDD A
GND A
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