CC3220 Datasheet, PDF (7/84 Pages) Texas Instruments – SimpleLink Wi-Fi Wireless and Internet-of-Things Solution, a Single-Chip Wireless MCU

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CC3220
SWAS035A – SEPTEMBER 2016 – REVISED FEBRUARY 2017
3.2 Pin Attributes and Pin Multiplexing
The device 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 device reset) and register control.
NOTE
TI highly recommends using Pin Mux Tool to obtain the desired pinout.
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 3-1 describes the general pin attributes and presents an overall view 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. The drive strength is individually configurable for
each pin.
• All I/Os support 10-µA pullups and pulldowns.
• The VIO and VBAT supply must be tied together at all times.
• All digital I/Os are nonfail-safe.
NOTE
If an external device drives a positive voltage to the signal pads and the CC3220x device is
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 CC3220x device can occur. To prevent
current draw, TI recommends any one of the following conditions:
• All devices interfaced to the CC3220x device 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 CC3220x device must be held low until the VBAT supply to the
device is driven and stable.
• All GPIO pins default to mode 0 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.
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Terminal Configuration and Functions
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