ACR350 Validator with QR Code Scanner
–
User Manual
Version 1.02
www.acs.com.hk
Page 32 of 61
2.5. Ignition Sense
ACR350 has ignition sense function. It can detect the status of ignition signal and let application
software to do further action, e.g. switch to maintenance mode for data transfer / data backup. The
input of ignition pin is located at the 4-pin power connector as shown below.
Figure 9
: Ignition Sense Pinout
The voltage level of ignition input is assumed to be same as input voltage, i.e. 9-36V. When ignition
input is within this range, a 3.3V logic High signal sends to CPU.
There is opto-coupler in ACR350 to isolate CPU from high voltage ignition signal.
Note:
When the
Ignition pin
is not used, it
must be connected to input voltage pin VIN
. Otherwise
ACR350 will not power up.
Connection example of Ignition:
Figure 10
: Ignition Sense Connection Example
ignition
Vin
GND GND
+ -
Battery
12V-24V
Ignition Switch
Ignition
Vin
GND
GND
ACR350
4P Connector
Optocoupler
Igniton signal to CPU
To Power circuit
To circuit ground
ACR350
