Nordic 3 - Infrared Emitter;Receiver; Buzzer

6 Hardware description: Smart Remote 3 nRF52 product example
Doc. ID 4374_139 v1.1
Page 53
The NFC antenna must be connected to P4, to enable the NFC feature of the smart remote.
P0.09/NFC1
P0.10/NFC2
NF
C
1
2
3
4
5
P4
WCON-5140-5-XX
C43
330pF
C42
330pF
Figure 42: NFC connector schematic
6.3.11 Infrared emitter/receiver
Infrared emitter and receiver circuitry.
The IR emitter are turned on and off by applying PWM pulses to the IR LED pin (P0.24). The IR receiver are
turned on by pulling the IR_REC pin (P0.23) high. The IR signal from the IR receiver are sent to the nRF52 SoC
through the node IR SIGNAL pin (P0.21).
Vs
2
OUT
3
GND
6
IN
7
GND
8
U5
VSOP98260
C20
100nF
Q2
FDV303N
IR_REC
Q3
FDV303N
IR_LED
IR_SIGNAL
R8
0R
VDD
R11
1M0
GND
GND GND
R6
2R2
R12
1M0
GND
LD1
IR333C/H2
C27
100µ
F
Figure 43: Infrared emitter/receiver schematic
6.3.12 Buzzer
Buzzer circuitry.
The buzzer is activated by pulling the buzzer pin (P0.04) high.