6 Hardware description: Smart Remote 3 nRF52 product example
Doc. ID 4374_139 v1.1
Page 45
Battery
Low power
accelerometer
VDD
Motion tracking
device
Digital
microphones
Keypad
Power switch
SWD connector
nRF52832
Infrared
emitter/receiver
LED
Buzzer
VDD
VIO_GYRO
VIO_PDM
Figure 33: Block diagram
6.3 Design description
This chapter contains details about the hardware blocks on the Smart Remote 3 for nRF52 product example.
6.3.1 I/O usage
The nRF52832-QFAA has 32 generic I/Os available. All I/Os are used in this design and are organized as shown
in table below.
Table 5: I/O usage
I/O Label Description
P0.00 XL1 32.768 kHz crystal
P0.01 XL2 32.768 kHz crystal
P0.02 DEBUG_LED Output for debug LED
P0.03 KEYOUT_4 Output to keypad column 4
P0.04 Buzzer Output to buzzer
P0.05 MIC_DOUT Input from digital microphone
P0.06 MIC_CLK Clock signal for digital microphone
P0.07 VIO_GYRO_SW On/off switch for accelerometer
and gyro
P0.08 KEYOUT_2 Output to keypad column 2
P0.09 NFC1 NFC antenna
P0.10 NFC2 NFC antenna
P0.11 KEYOUT_3 Output to keypad column 3
P0.12 KEYOUT_0 Output to keypad column 0
P0.13 I2C_DATA_2 Two-wire 2 master data
P0.14 I2C_CLK_2 Two-wire 2 master clock
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