Footprint and Pinout

The LL-RLP-20 and the LL-RXR-27 share the same footprint and pinout.

Footprint

The following figure depicts the footprint of the LL-RLP-20 and/or LL-RXR-27 module.

Footprint

Pinout

Pin #1

Name

Type

Description

1

GND

Ground

2

ANT2,3

RF I/O

RF path if not using U.FL connector

3

VBAT

Input voltage

Optional unregulated supply voltage (3.5 to 5.5 V)

4

LDO_OUT4

Output voltage

Power digital (3.3 V)

5

VCC

Input voltage

Regulated supply voltage (2.5 to 3.3 V)

6

N/C

Float

7

nRESET

I

External reset pin, active low

8

IO0

O

Status message indicator

9

GND

Ground

10

N/C

Float

11

N/C

Float

12

N/C

Float

13

N/C

Float

14

N/C5

Float

15

N/C

Float

16

N/C

Float

17

nBOOT

I

N/C = Boot normally, GND = Bootloader

18

N/C

Float

19

N/C

Float

20

N/C

Float

21

N/C

Float

22

N/C

Float

23

RXIN6

I

UART interface: module RX

24

TXOUT6

O

UART interface: module TX

25

GND

Ground

1All not-connected pins should be floated.

2RF connection is via U.FL connector on upper left side of the module or pin 2.

3RF output is 50 Ohms, DC blocking capacitor not required.

4If using VBAT, must tie LDO_OUT to VCC.

5If Pin 14 is floating or high, UART baud rate is 115200. If Pin 14 is grounded or low, UART baud rate is 9600.

6Default UART baud rate is 115200 8n1.

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