User's Manual

RN4020
DSXXXXXXXXA-page 4  2014 Microchip Technology Inc.
TABLE 1-1: PIN DESCRIPTION
Pin Symbol Description Function
1 GND Ground Ground
2 AIO2 Bi-directional with programmable analog IO 1.65V input, 1.35V out, and 30mA max out
3 AIO1 Bi-directional with programmable analog IO 1.65V input, 1.35V out, and 30mA max out
4 AIO0 Bi-directional with programmable analog IO 1.65V input, 1.35V out, and 30mA max out
5 UART TX UART TX Output from RN4020
6 UART RX UART RX Input to RN4020
7 WAKE-SW Deep Sleep Wake; active high to wake
module from deep sleep
Input; weak pull down
8 CMD/DATA Command or Data – In Command , UART
traffic is sent to command interpreter, other
maybe routed to Microchip Serial Data ser-
vice.
Input; Active High to enter Command
9 GND Ground Ground
10 SPI-CLK
GPIO[1]
SPI-CLK for diagnostics and factory calibra-
tion if pin 17 asserted. Default state is out-
put: Active Low indicates module is
connected to remote device. High level indi-
cates disconnected state. Configurable as
GPIO[1] via software command.
• SPI-CLK
• Connected Status (Green LED)
• GPIO[1]
11 SPI-CS#
GPIO[2]
SPI-CS# for diagnostics and factory calibra-
tion if pin 17 asserted. Default state is out-
put. Active High indicates module has a
pending event. Low level indicates no
events. Event only triggered in DATA , pin 8
is high. Configurable as GPIO[2] via soft-
ware command.
• SPI-CS#
• Event Pending (Red LED)
• GPIO[2]
12 SPI-MOSI
GPIO[3]
SPI-MOSI for diagnostics and factory cali-
bration if pin 17 asserted. Default state is
output. Active High indicates module is
awake and active. Low level indicates a
sleep state. Configurable as GPIO[3] via
software command.
• SPI-CLK
• Wake Status (Blue LED)
• GPIO[3]
13 SPI-MISO
GPIO[4]
SPI-MISO for diagnostics and factory cali-
bration if pin 17 asserted. Configurable as
GPIO[4] via software command.
• SPI-CLK
• GPIO[4]
14 CTS
GPIO[6]
Reserved for CTS if hardware flow control is
on UART. Configurable as GPIO[6] if hard-
ware flow control is disabled.
• CTS (input)
• GPIO[6]
15 WAKE-HW Hardware wake from Hibernate or Dormant
state
Active High; internal pull down
16 GND Ground Ground
17 SPI/PIO
SPI/PIO for pins 10-13, Active High Input with internal pull down; selects SPI on 10-
13
18 RTS
GPIO[5]
Reserved for RTS if hardware flow control
on UART. Configurable as GPIO[5] if hard-
ware flow control disable
• RTS (output)
• GPIO[5]
19 ADVCONN
GPIO[7]
Active Low; In Peripheral the input put
module in advertising state (discoverable
and open for connection). In Central , initi-
ates connect to stored address.
Initiate Advertising state or connect to stored
address
20 RSVD Do not connect. Factory diagnostics NC
DRAFT