Nordic 3 - Design Description; Trackpad

5 Hardware description: Smart Remote 3 DK add-on
Doc. ID 4374_139 v1.1
Page 30
Infrared emitter/
receiver
Battery
Keypad
Voltage regulator
I/O expander
Codec
nRF5x-DK
interface
Low power
accelerometer
Motion tracking
device
Analog
microphone
Digital
microphones
Audio jack
Power control
Level translatorTrackpad
DK select
Figure 15: Block diagram
5.3 Design description
The design description provides detailed descriptions of Smart Remote 3 DK add-on hardware blocks.
5.3.1 Trackpad
The trackpad is mounted onto the PCA63519 board and connected to the P12 connector.
Figure 16: Trackpad interface connector
The trackpad is interfaced through the two-wire bus interface. See the table below for the trackpad pin
description:
Table 1: Trackpad pin description
Pin Label Description
1 NC Not connected
2 WU_IRQ_TP Interrupt from trackpad
3 GND Ground
4 I2C_CLK_TP Two-wire serial clock