The design description contains details about the hardware blocks on the Smart Remote 3
for nRF52810 product example.
I/O usage
The nRF52810-QFAA has 32 generic I/Os available. All I/Os are used in this design and are organized as shown in table below.
Keypad matrix
The keypad on the PCA20031 board has 39 buttons.
Low-power accelerometer circuit
To obtain low power consumption and long battery lifetime, a low-power three-axis accelerometer (U7) has been added to the remote control.
Motion tracking device
For advanced features, the remote control has a three-axis gyro integrated with a three-axis accelerometer (U6).
Power supply
The Smart Remote 3 product example is powered from two AA batteries.
Programming interface
A connector for the ARM SWD interface is included on the product example for easy firmware upgrade purposes.
Digital microphone
The Smart Remote 3 product example is equipped with one digital output PDM microphone.
Matching network
The matching network is made up of discrete components and the impedance is tuned to 50 Ω.
Antenna
The antenna is of meander type and it is integrated in the PCB layout.
Infrared emitter
The infrared emitter is turned on and off by applying PWM pulses to the IR LED pin (P0.24).
Power consumption performance
These Smart Remote 3 performance indications for the product example are reached by specific hardware and firmware revisions.