JVC MX-GC5 Service Manual page 29

3. Pin description
Pin No. Name
1 to 3 S3 to S1
5 to 10 LED6 to
LED1
11 SENB
12 SDIN
13 SCLK
15 OSC
18 to 26 G1 to G9
27to 33 S39/G10
to
S33/G16
34 to 47 S32 to S19
50 to 64 S18 to S4
16,49 VDD
4,14 VSS
17,48 VEE
Function
Segment driver output pins (segment only). This is P-ch
open-drain output with pull-down resistor
6 LED driver output ports. This is a CMOS output pin.
Serial Interface Enable
All shifted data is latched into the corre sponding regist er
at the rising edge of SENB.
Serial Interfac e Data IN
Input serial data at the rising edge of the shift clock.
Serial Interface Clock
Reads serial data at the rising edge when SENB is low
Connected to an external resistor or an RC oscillator
circuit.
Grid driver output pins (Grid only). This is push-pull
cmos output.
Segment or Grid driver output pins. These pins are
sele ctabl e for segment or grid driving. This is P-ch open
drain output with pull-down resistor
Segment driver output pin s (segment only). This is P-ch
open-drain output with pull-down resistor
Segment driver output pins (segment only). This P-ch
open-drain output with pull-down resistor
Positive power ( Internally connected )
Ground ( Internally connected )
Negative power for driving VFD Panel ( Internally
connected )
IN/OUT
O
O
I
I
I
I/O
O
O
-
O
O
PWR
GND
PWR