41
Decode Board (TTL) Output to Host Connector
Figure 35. Decode Board (TTL) Output Connector
Pin
Signal Name
Function
1
232INV
Input: TTL RS232 polarity control with 32k ohm pull-up.
2
Vin
Power: Supply voltage input (3V to 5.5V)
3
GND
Ground: Power and signal ground.
4
(n)RxD
Input: TTL Level RS232 Receive data input.
5
(n)TxD
Output: TTL Level RS232 transmit data.
6
(n)CTS
Input: TTL level Clear to Send.
7
(n)RTS
Output: TTL level RS232 Request to Send.
8
PWRDWN
Output: active high = IS4920 is in power down mode.
9
nBEEPER
Output: active low signal capable of sinking current.
10
nGoodRead
Output: active low signal for sinking current (Good Read).
11
nWAKE
Input: Signal used to bring engine out of power-down.
12
nTrig
Input: Signal used as trigger input to activate the IS4920
