User`s manual

Page 26 of 36 A2541R24x – User’s Manual
Release Date 11/22/13
Table 7 A2541R24x20 pin descriptions with references to chip pins
For details regarding the pin functions, please refer to Emmoco wiki page at
http://wiki.emmoco.com.
Pin Number
Pin Name Pin Type Description
TPS62730
PIN
CC2541 PIN
1, 3,12, 14,
22, 34
GND
Common
Ground
Connect to GND
2 DNC
Do Not Connect. Connecting this pin to anything will
significantly affect the performance of the module and may
void the end users right, under FCC, to operate the module
4 VDD_OUT Power (Analog)
DC-DC Converter Vout. 2.1V when converter is ON, VDD_IN
when in BYPASS mode. Up to 75mA drive capability
6
5 CONV_STAT Digital Output
DC-DC Converter Status pin. Open-drain with a 3.3kΩ series
resistor
1
6 NC Pin is not internally connected
7 (P2_2) Digital I/O Not used. Internal pullup is enabled 34
8 (P2_1) Digital I/O Not used. Internal pullup is enabled 35
9, 23, 25 STATUS Digital I/O
Status outputs that can be used to drive LEDs or MCU
GPIOs
36, 11, 13
10 RXD Digital I/O
Admin UART RXD pin. Requires external pullup if not always
driven by an external UART device.
37
11 TXD Digital I/O Admin UART TXD pin 38
13 SCL
I
2
C clock
Can be used as I
2
C clock or digital I/O. Leave floating if not
used. If grounded disable pull up
2
15 SDA
I
2
C data
Can be used as I2C data or digital I/O. Leave floating if not
used. If grounded disable pull up
3
16
CONV_ON/
BYP_CNTRL
Digital Input
DC-DC Converter ON or Bypass control input. Logic 0 for
bypass, logic 1 for converter ON
There is a 1 MΩ resistor between pin 16 and pin 20
5
17 RTS# Digital I/O Admin UART RTS pin 5
18 CTS# Digital I/O
Admin UART CTS pin. Requires external pullup if not always
driven by an external UART device.
6
19 (P1_3) Digital I/O Not used. Internal pullup is enabled 7
20
CONV_ON/
BYP_READ
Digital Output
CC2541 Port 1.2 status read.
There is a 1 MΩ resistor between pin 16 and pin 20
8
21 DNC Digital I/O Do Not Connect. This pin is driven low by the firmware. 9
24 (P0_7) Digital I/O Not used. Internal pullup is enabled 12
26 RTS# Digital I/O Communication UART RTS pin 14
27 CTS# Digital I/O Communication UART CTS pin 15
28 TXD Digital I/O Communication UART TXD pin 16
29 RXD Digital I/O Communication UART RXD pin 17
30 (P0_1) Digital I/O Not used. Internal pullup is enabled 18
31 CONTROL Digital I/O Control Input. Internal pullup is enabled 19
32 RESET_N Digital input Reset, active-low, see datasheet for implementation 20
33 VDD_IN
Power
(Analog)
Analog power supply connection for the Radio (2.0V to 3.6V)
through DC-DC converter
3