CC3200MOD_15 Datasheet, PDF (10/66 Pages) Texas Instruments – CC3200MOD SimpleLink™ Wi-Fi® and Internet-of-Things Module Solution, a Single-Chip Wireless MCU

CC3200MOD
SWRS166 – DECEMBER 2014
www.ti.com
3.3 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 3-2 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 configurable individually for each
pin.
• All I/Os support 10-μA pullups and pulldowns.
• These pulls are not active and all of the I/Os remain floating while the device is in Hibernate state.
• 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 CC3200MOD is not
powered, DC current is drawn from the other device. If the drive strength of the external
device is adequate, an unintentional wakeup and boot of the CC3200MOD can occur. To
prevent current draw, TI recommends any one of the following:
• All devices interfaced to the CC3200MOD must be powered from the same power rail as
the chip.
• Use level-shifters between the module and any external devices fed from other
independent rails.
• The nRESET pin of the CC3200MOD must be held low until the VBAT supply to the
module is driven and stable
10
Terminal Configuration and Functions
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