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

 

 

 

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