Panasonic KX-T7456 - Digital 24 Button Speakerphone Display, Specifications

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Name NO. I/O Classification Function
APMP 1
Analog
input
Analog
Non-invering input terminal of microphone amplifier M1.
Connect to the microphone.
VREFDA
2 ---
Power
supply, etc.
Reference voltage teminal of DAC.
Connect the capacitor of 40 F between this terminal
(AG2).
AG1 3
Ground terminal of the analog circuit.
HO+
4
Analog
output
Analog
Output terminal for the handset receiver.
HO+ terminal and HO- terminal are biased to Vdd/2 voltage.
HO- terminal is the inverse porality output terminal for pin
+).
Connect the capacitor in series between the handset and
terminals to cut the DC.
Use the nonpolar type capacitor.
HO- 5
A5V1 6 ---
Power
supply, etc.
5V power supply terminal of analog circuit.
A5V2 7
SPO 8
Analog
output
Analog
Output treminal for the speaker amplifier.
Connect to the external speaker amplifier input terminal.
SPO terminal is biased to Vdd/2 voltage.
Connect the capacitor of 0.1 F in series between the
speaker amplifier input terminal and this terminal.
AG2 9 ---
Power
supply, etc.
Ground terminal of the analog circuit.
P/-S 10
CMOS
inout
Micro-
computer
interface
Mode selection terminal of microcomputer interface.
Inputting “0“ selects the serial mode, and “1“ selects the
parallel mode.
-RESET 11
System reset terminal.
The system is reset when “0“ is pressed.
DG1 12 ---
Power
supply, etc.
Ground terminal of the analog circuit.
OP0 13
3 states
output
Output port Outputs BIT0 signal of OPORT1 resistor.
OP1 14 Outputs BIT1 signal of OPORT1 resistor.
D5V1 15 ---
Power
supply, etc.
5V power supply terminal of analog circuit.
OP2 16
3 states
output
Output
Outputs BIT2 signal of OPORT1 resistor.
OP3 17 Outputs BIT3 signal of OPORT1 resistor.
OP4 18 Outputs BIT4 signal of OPORT1 resistor.
OP5 19 Outputs BIT5 signal of OPORT1 resistor.
OP6 20 Outputs BIT6 signal of OPORT1 resistor.
OP7 21 Outputs BIT7 signal of OPORT1 resistor.
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