Holt Integrated Circuits
15
Daisy Chain Board Connections
SPI Connector (J28)
Pin
Number
Label
Description
1
VLOGIC
3.3V/ 5V Logic supply
2
nCS
SPI Chip Select
3
SCK
SPI Serial Clock Input of U4
4
SO
SPI Serial Output from U4
5
SI
SPI Serial Input of U4
6
INTB
Interrupt output from U4
7
GND
Low voltage Ground
Parallel Data out connector (J22)
Pin
Number
Label
Description
1
GND
Low voltage Ground
2
INTB
Interrupt output from U4
3
NC
Not Connected
4
nOE
Output Enable (active low)
5
SO1
Sense Output 1
6
SO2
Sense Output 2
7
SO3
Sense Output 3
8
SO4
Sense Output 4
