User's Manual

www.rovingnetworks.com Version 1.1 3/19/13 page 4
Advanced Information
RN52-DS
Figure 1-3 shows the pinout and Ta b le 1-4 describes
the module’s pins.
FIGURE 1-3: PIN DIAGRAM
RN52
Top View
GND GPIO7 GPIO6 PWREN VDD PCM_IN PCM_OUT PCM_SYNC PCM_CLK GND
GND
GPIO3
GPIO2
AICO0
GPIO4
GPIO5
GPIO12
GPIO13
GPIO11
GPIO10
GPIO9
USBD-
USBD+
UART_RTS
UART_CTS
UART_TX
UART_RX
GND
SPKR_L+
SPKR_R+
SPKR_L-
SPKR_R-
AGND
MIC_R-
MIC_L-
MIC_R+
MIC_L+
MIC_BIAS
LED0
LED1
SPI_MOSI
SPI_SCK
SPI_MISO
SPI_SS
GND GND GND GND GND GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
18 19 20 21 22 23 24 25 26 27
50 49 48 47 46 45
TABLE 1-4: PIN DESCRIPTION (PART 1 OF 3) Note 1
Pin Symbol I/O Type Description Direction Default
1 GND Ground. Ground.
2 GPIO3 Bidirectional with program-
mable strength internal
pull-up/down.
This pin enters device firmware update (DFU)
mode at bootup if a USB device powers VBUS.
GPIO3 requires 47 kΩ to ground and 22 kΩ to
the USB VBUS signal if the USB VBUS is supply-
ing power to the main board.
Input Low
3 GPIO2 Bidirectional with program-
mable strength internal
pull-up/down.
Reserved, event register. Toggles from high to
low for 100 ms to indicate that the module’s state
has changed. A microcontroller can enter com-
mand mode and poll the state register using the
Q action command.
Output High
4 AIO0 Bidirectional. Analog programmable input/output line. I/O
5 GPIO4 Bidirectional with program-
mable strength internal
pull-up/down.
Factory reset mode. To reset the module to the
factory defaults, GPIO4 should be high on
power-up and then toggle low, high, low, high
with a 1 second wait between the transitions.
Input Low