Fingerprint Sensor Module
GTM-5210F32
www.bestmodulescorp.com 3 / 16 Rev. 1.1
There is no need to program the touch IC to use this module as the touch IC is
programmed during IC production.
This module is shipped without four wire cables. Users must prepare a cable
assembly to use this module.
Reduce the Standby Power Consumption
The touch IC within this module is used to detect whether finger contact is
made on the sensor. When a finger touches the fingerprint sensor metal frame,
the touch IC connector pin 4 (ICPCK) output will be high, otherwise it remains
at a low level.
In daily operation we only need to power on the fingerprint sensor module after
finger contact is made on the sensor to reduce the standby power consumption.
We can use external circuits or a microcontroller (such as an Arduino board) to
detect the ICPCK signal and then supply power to the UART connector pin 4
(VCC) when the ICPCK signal is high.
When applying this method to save power, remember to always supply power
to the touch IC. However, if the touch IC function is not required, the touch IC
connector can remain unused, allowing the fingerprint sensor module to keep
working normally. In this case, remember to always supply power to the
module at the UART connector pin 4 (VCC).
Using the Module with an Arduino Uno
This module has many protocol commands. External controllers can use these
protocol commands for its operation. In this section we use the Arduino Uno
board to work alongside the fingerprint sensor module, the GTM-5210F32.
Logic Level Converter
The Arduino Uno board operates at 5V while the fingerprint sensor module
UART interface is at a 3.3V level. As a result of these level differences a logic
level converter is required. Below is a simple logic level converter circuit. Note
that this circuit is for 5V/3.3V TTL level converting. If a 5V controller board is
not being used, do not use this circuit.
