Be careful with the GT-521F52’s connectors

According to the datasheet the module can be powered from 3.3 to 6 volts. Connecting the power supply requires care and attention, because the highly symmetrical module has two identical 4-pin connectors on either side of the sensor that both accept a supply voltage, but not the same, and they are wired differently. To distinguish between the two connectors use the two capacitors placed in one corner of the board as orientation mark.

The GT-521F52’s serial interface

The connector closest to the two capacitors has the serial port on it and accepts a 3.3 to 6 volts supply voltage. The serial port signals (default setting is 9600n81) are specified as 3.3 V signals and a level converter would be needed to connect it to for instance a 5-volt system like an Arduino Uno, but direct hooking up to a computer is possible with a 3.3-volt “FTDI” cable. Remember that FTDI cables, even the 3.3-volt ones, always have 5 V on their supply wire.

 
Connected to the GT-521F52!

Integrated Touch Sensor

The “other” connector is for the touch interface and expects 3.3 volts maximum. The metal sensor frame functions as a touch sensor and the signal ICPCK available on this connector indicates if a finger is on the sensor or not. Touching the sensor can also be used to wake the module up from idle mode. Updating the firmware (no new firmware available at the time of writing) requires this connector too.
 
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