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SWRS225B – FEBRUARY 2019 – REVISED MARCH 2020
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Terminal Configuration and Functions
Copyright © 2019–2020, Texas Instruments Incorporated
4.2
Pin Attributes
describes the CC3135MOD pins.
NOTE
Digital IOs on the CC3135MOD refer to hostless mode, BLE/2.4 GHz coexistence, and
antenna select IOs, not general-purpose IOs.
If an external device drives a positive voltage to signal pads when the CC3135MOD 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 CC3135MOD device can occur.
To prevent current draw, TI recommends one of the following:
•
All devices interfaced to the CC3135MOD must be powered from the same power rail as
the CC3135MOD device.
•
Use level shifters between the CC3135MOD and any external devices fed from other
independent rails.
•
The nRESET pin of the CC3135MOD device must be held low until the V
BAT
supply to
the device is driven and stable.