CozIR
®
-LP3 Evaluation Board User Guide
Revision 1.5: 15 December 2020
Page | 8 For regular updates, go to https://gassensing.co.uk
STANDALONE OPERATION
The sensor can be completely isolated from the rest of the evaluation board electronics. This allows
the user to conveniently control the sensor directly via edge connectors J3, J4 and J5. To operate in
this manner, the DIP switches (S5) must be set to isolate the sensor from the microcontroller by
putting them into the off position.
Figure 3: DIP Switches (S5, shown in OFF position)
The evaluation board is shipped with the DIP switches set
ON
(see label on switch) to connect the
sensor to the on-board microcontroller by default. To isolate the sensor from the on-board
microcontroller, set the switches to
OFF.
Power supply connections to the sensor are described in
the following section.
The sensor switch connections on the DIP switches are listed below.
SWITCH POSITION
NAME
TYPE
DESCRIPTION
1
Rx_In
Digital Input
UART Receive Input
2
Tx_Out
Digital Output
UART Transmit Output
3
NC
Unused
Do not connect (For internal use only)
4
PWR_ON
Digital Input
Sensor Power On Enable pin.
-
Power on – High
-
Power off – Low
5
ALARM
Digital Output
Alarm Output
6
READY
Digital Output
Data ready pin. Pulsed high when data
ready
7
I2C_SDA
Digital Input/Output
I
2
C serial data input/output. Pull-up
resistor to VDD is provided on the
evaluation board.
8
I2C_SCL
Digital Input
I
2
C serial clock input. Pull-up resistor to
VDD is provided on the evaluation
board.
9
I2C_ENABLE
Digital Input
Set low for I
2
C interface mode. Leave
floating to select UART interface mode.
Pin status detected at power on.
10
PWM_RS485
Digital Output
PWM Output
