J7007: 21-Pin Keyboard Interface - Hytera PT580 Service Manual

Pin No.
20
21
22
24
25
27
28
29
30

J7007: 21-Pin Keyboard Interface

Pin No.
1
4
21
2
3
5
6
16
7
8
9
10
11
12
13
14
Name
RS
WR
/OE
3V3D
LEDA
LEDK1
LEDK2
LEDK3
Name
GND
LOW-MIC+
LOW-MIC-
I2C-SCL
I2C-SDA
L_INT
KB-C3
KB-C4
KB-C0
KB-C1
KB-C2
KB-R1
KB-R2
KB-R3
Function
Data and command
Write signal
Read signal
Power supply: 3.3V
Power supply for backlight
Backlight control
Function
Ground (analog & digital)
Lower MIC interface
Reserved
Keyboard column
Keyboard row
21
Service Manual
Valid Level
-
L
L
-
-
L
Valid Level
L
-
-
-
L