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RN -42 -DS
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Figure 2. RN-42/RN-42-N Pinout
27 26 25
GND
1
24
SPI_MISO
GND
1
24
SPI_MISO
SPI_MOSI
GPIO6
GPIO7
RESET
SPI_CLOCK
PCM_CLK
PCM_SYNC
PCM_IN
PCM_OUT
VDD
GND
2
3
4
5
6
7
8
9
10
11
12
RN-42
Top View
23
22
21
20
19
18
17
16
15
14
13
SPI_CSB
GPIO4
GPIO5
GPIO3
GPIO2
USB_D-
USB_D+
UART_CTS
UART_RTS
UART_TX
UART_RX
SPI_MOSI
GPIO6
GPIO7
RESET
SPI_CLOCK
PCM_CLK
PCM_SYNC
PCM_IN
PCM_OUT
VDD
GND
2
3
4
5
6
7
8
9
10
11
12
RN-42-N
Top View
23
22
21
20
19
18
17
16
15
14
13
SPI_CSB
GPIO4
GPIO5
GPIO3
GPIO2
USB_D-
USB_D+
UART_CTS
UART_RTS
UART_TX
UART_RX
35 29 34 33 32 31 28 30
35 29 34 33 32 31 28 30
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Table 7. Pin Description
Pin
Name
Description
Default
Voltage
(V)
1
GND
Ground
0
2
3
4
SPI_MOSI
GPIO6
GPIO7
Programming only
Set BT master (high = auto-master mode)
Set Baud rate (high = force 9,600, low = 115 K or
No Connect
Input to RN-42with weak pulldown
Input to RN-42 with weak pulldown
3
0 - 3.3
0 - 3.3
firmware setting)
5
RESET
Active-low reset. Hold low for low-power
Input to RN-42 with 1K pullup
operation.
6
7
8
9
10
11
12
SPI_CLK
PCM_CLK
PCM_SYNC
PCM_IN
PCM_OUT
VDD
GND
Programming only
PCM interface
PCM interface
PCM interface
PCM interface
3.3-V regulated power input
Ground
No Connect
No Connect
No Connect
No Connect
No Connect
13
14
15
16
17
18
UART_RX
UART_TX
UART_RTS
UART_CTS
USB_D+
USB_D-
UART receive Input
UART transmit output
UART RTS, goes high to disable host transmitter
UART CTS, if set high, disables transmitter
USB port
USB port
Input to RN-42
High level output from RN-42
Low level output from RN-42
Low level input to RN-42
Pull up 1.5 K when active
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
0 - 3.3
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