Harman Kardon AVR125 Service Manual page 40
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- Brochure & specs (40 pages) ,
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AVR125
VFD DRIVER IC PIN FUNCTION (LC75725E) : IC74
Pin
Pin No.
V
1, 13
FL
V
60
DD
V
57
SS
OSCI
59
OSCO
58
BLK
61
CL
63
DI
64
CE
62
G1 to G11
2 to 12
S1 to S43
56 to 14
BLOCK DIAGRAM
Driver block power supply connection. (Both pins must be connected.)
Logic block power supply connection. Provide a voltage between 4.5 and 5.5 V.
Power supply connection. Connect to the ground.
Oscillator connection. An oscillator circuit is formed by connecting an external resistor
and capacitor to these pins.
Display off control input.
BLK = Low (V
) ... Display off. (S1 to S43 and G1 to G11 at V
SS
BLK = High (V
) ... Display on.
DD
Note that serial data can be transferred while the display is turned off.
Serial data transfer inputs. These pins must be connected to the system microcontroller.
CL: Synchronization clock
DI: Transfer data
CE: Chip enable
Digit outputs. These pins are P-channel open drain outputs with pull-down resistors.
Segment outputs for displaying the display data transferred by serial data input. These pins
are P-channel open drain outputs with pull-down resistors.
Function
level.)
FL
40
harman/kardon
I/O
Handling when unused
—
—
—
—
—
—
I
GND
O
OPEN
I
GND
I
GND
O
OPEN
O
OPEN
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