ThingMagic Mercury xPRESS, Platform Manual, Page: 117 / 146

A D I V I S I O N O F T R I M B L E
Hardware Reference Guide
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unanticipated results might occur if commands from both interfaces are not carefully
coordinated.
Programmable LEDs and Switch
Three programmable LEDs (green - LED0, yellow - LED1, blue - LED2) are connected to
high drive IO pins of the MCU. These can be used as indicators for user applications.
A push-button switch, “User Switch”, is provided to control user applications.
Their functionality when the xPRESS board is running the RFID Sensor application is
explained in the
Using the Sample Application chapter.
Buzzer
A piezo buzzer on the main board is connected to a programmable output pin on the
MCU. The buzzer is driven from a square wave with a frequency between 1 kHz and 6
kHz. The volume varies with frequency, putting out 90 dB at 4 kHz and 60 dB at 2 kHz.
“Coin” battery