Table 7-2. CC3220MODAx Connections for Unused Pins
PIN
DEFAULT
FUNCTION
STATE AT RESET AND
HIBERNATE
I/O TYPE
DESCRIPTION
20
NC
WLAN analog
–
Reserved. Do not connect.
29
NC
WLAN analog
–
Reserved. Do not connect.
31
NC
WLAN analog
–
Reserved. Do not connect.
33
NC
WLAN analog
–
Reserved. Do not connect.
39
NC
WLAN analog
–
Reserved. Do not connect.
41
NC
WLAN analog
–
Reserved. Do not connect.
45
NC
WLAN analog
–
Reserved. Do not connect.
7.4 Pin Attributes and Pin Multiplexing
The module makes extensive use of pin multiplexing to accommodate the large number of peripheral functions in
the smallest possible package. To achieve this configuration, pin multiplexing is controlled using a combination of
hardware configuration (at module reset) and register control.
The board and software designers are responsible for the proper pin multiplexing configuration. Hardware does
not ensure that the proper pin multiplexing options are selected for the peripherals or interface mode used.
describes the general pin attributes and presents an overview of pin multiplexing. All pin multiplexing options
are configurable using the pin MUX registers. The following special considerations apply:
• All I/Os support drive strengths of 2, 4, and 6 mA. Drive strength is individually configurable for each pin.
• All I/Os support 10-μA pullup and pulldown resistors.
• By default, all I/Os float in the Hibernate state. However, the default state can be changed by SW.
• All digital I/Os are non fail-safe.
Note
If an external device drives a positive voltage to the signal pads and the CC3220MODx or
CC3220MODAx modules are not powered, DC is drawn from the other device. If the drive strength
of the external device is adequate, an unintentional wakeup and boot of the CC3220MODx or
CC3220MODAx modules can occur. To prevent current draw, TI recommends any one of the following
conditions:
• All devices interfaced to CC3220MODx and CC3220MODAx modules must be powered from the
same power rail as the chip.
• Use level shifters between the device and any external devices fed from other independent rails.
• The nRESET pin of the CC3220MODx and CC3220MODAx modules must be held low until the
VBAT supply to the module is driven and stable.
• All GPIO pins default to high impedance unless programmed by the MCU. The bootloader sets the
TDI, TDO, TCK, TMS, and Flash_SPI pins to mode 1. All the other pins are left in the Hi-Z state.
Table 7-3. Pin Attributes and Pin Multiplexing
GENERAL PIN ATTRIBUTES
FUNCTION
PAD STATES
Pkg.
Pin
Pin
Alias
Use
Select
as
Wakeu
p
Source
Confi
g.
Addl.
Analo
g Mux
Muxed
With
JTAG
Dig. Pin
Mux
Config.
Reg.
Dig.
Pin
Mux
Confi
g.
Mode
Value
Signal Name
Signal
Description
Signa
l
Direct
ion
LPD
S
Hib
nRESET =
0
1
GND
GND
N/A
N/A
N/A
N/A
N/A
GND
GND
N/A
N/A
N/A
N/A
2
GND
GND
N/A
N/A
N/A
N/A
N/A
GND
GND
N/A
N/A
N/A
N/A
SWRS206E – MARCH 2017 – REVISED MAY 2021
Copyright © 2021 Texas Instruments Incorporated
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