JVC MX-GT700 Service Manual page 33

3.Pin function
Symbol
Pin No.
Type
4 Clock
CL
3
DI
Input data
DO
5 Output data
VDD 15
Power supply
VSS
19
Ground
BO1 6
BO2 7
Output port
BO3 8
9
BO4
10
IO1
I/O Port
12
IO2
16
PD
Charge pump
output
AIN
17 L.P.F
AOUT
18
amplifier Tr
11 IF counter
IFIN
Functions
Used as the synchronization clock when serial data is input
to the LC72131 (DI ), or when serial data is output (DO).
Inputs serial data sent from the controller to the LC72131M.
Output serial data sent from the LC72131M to the controller.
The content of the output data is determined by the serial
data DOCO to DOC2.
The LC72131M power supply (VDD=4.5 to 5/5V)
The power on reset circuit operates when power is first applied.
The LC72131M ground.
Dedicated output pins
The output states are determined by BO1 to BO4 in the
serial data.
'Data"=0:Open
=1:Low
The pins go to the open state after the power-on reset.
An 8Hz time base signal can be output from BO1 when TBC
in the serial data is set to 1.
Note that the ON impedance of the BO1 pin is higher than
that of the other pins (BO2 to BO4)
Pins used for both input and output
The input or output state is determined by bits IOC1 and IOC2
in the serial state.
'Data"=0:Input port
=1:Output port
When specified for use as an input port :
The input state is transmitted to the controller through the
DO pin.
'Input state"=Low:data value
=High:data value
When specified for use as an output port :
The output state is determined by bits IO1 and IO2 in the
serial sate.
'Data"=0:Open
=1:Low
These pins go to the input port state after the power-on reset.
PLL Charge pump output
When the frequency generated by dividing the Local oscillator
frequency by N is higher than the reference frequency,
a high level will be output from the PD in. similarly, when that
frequency is lower, a low level will be output.
The PD pin goes to the high impedance state when the
frequencies agree.
The MOS transistor used for the PLL active Low-pass filter.
The input frequency range is from 0.4 to 12MHz.
The signal is supplied directly to the IF counter.
The result from the IF counter MBS is output through
the DO pin.
There are four measurement periods: 4, 8, 32 or 64ms.
0
1
MX-GT700
(2/2)
Circut confguration
S
S
S
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