CC3220MOD_017 Datasheet, PDF (18/100 Pages) Texas Instruments – SimpleLink Wi-Fi CERTIFIED Wireless MCU Modules

CC3220MOD, CC3220MODA
SWRS206B – MARCH 2017 – REVISED AUGUST 2017
www.ti.com
4.4 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. Table 4-4 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.
18
Terminal Configuration and Functions
Copyright © 2017, Texas Instruments Incorporated
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