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Application Note
1. Power, video out and Key board Interface
A power board has been added to the main board to allow 12V DC input. 2 connectors are provided for
connecting the video and key board connection. A demo key board has been provided for testing purpose.
Customer can build his own key board for real production.
1.1 Location of the Connector
SD Card
1.2 Key Board Circuit
R101
0R
R0603
C101
0.1UF
C0603
GND
KEY
Note: the keyboard input of DSP is connected to internal ADC circuit, thus, the accuracy of the resistor is
important in this application
1.3 Power On switch
PWRON
Rev 070625
Power Bd
Menu
MODE
S102
S101
T1
T1
KEY
KEY
R102
R103
82K 1%
2K4 1%
R0603
R0603
2.27V
0.22V
SW1
MGND
Vin
GND
Video out
Sensor Interface
Pwr SW
Up
Down
S103
S104
T1
T1
KEY
KEY
R104
R105
6K8 1%
150K 1%
R0603
R0603
0.56V
2.60V
1.4 Video Out connector
Video_Out
Enter
Left
S105
S106
T1
T1
KEY
KEY
R106
R107
15K 1%
27K 1%
R0603
R0603
1.01V
1.45V
RCA
1
Right
S107
T1
KEY
R108
47K 1%
R0603
1.89V
6
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