User's Manual

19
20
RTS#
21
CTS#
22
PIO8
23
PIO7
24
PIO6
25
PIO5
26
PIO4
27
PCM_IN
28
PCM_OUT
29
PCM_SYNC
30
PCM_CLK
31
DGND
32
SPI_CS#
33
SPI_CLK
34
SPI_MISO
35
SPI_MOSI
36
LED0
37
VDD_BAT
38
VDD_CHG
39
AGND
40
MIC_BIAS
41
AUDIO_IN _P_RIGHT
42
AUDIO_IN _N_RIGHT
43
AGND
44
AUDIO_IN _P_LEFT
45
AUDIO_IN_N_LEFT
46
AUDIO_OUT _N_RIGHT
47
AUDIO_OUT _P_RIGHT
48
AGND
49
AUDIO_OUT_N_LEFT
50
AUDIO_OUT_P_LEFT
RFTP
RF test point
Table 8: WT32 device terminals
4.1 Device Terminal Functions
DGND
Connect digital GND pins to the ground plane of the PCB.
AGND
Ground for the audio signals. AGND and DGND are internally combined in WT32. Use solid ground
plane for AGND and keep AGND and DGND planes separated.
VDD_IO
Supply voltage connection for the digital I/Os of the module. Supply voltage at this pin can vary between
1.8 V and 3.3 V. Output voltage swing at the digital terminals of WT32 is 0 to VDD_IO.