CC256X_13 Datasheet, PDF (12/51 Pages) Texas Instruments – Bluetooth and Dual-Mode Controller

CC256x
SWRS121C – JULY 2012 – REVISED OCTOBER 2013
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3.3.3 Power Supplies and Shutdown—Static States
The nSHUTD signal puts the device in ultra-low power mode and also performs an internal reset to the
device. The rise time for nSHUTD must not exceed 20 μs, and nSHUTD must be low for a minimum of
5 ms.
To prevent conflicts with external signals, all I/O pins are set to the high-impedance state during shutdown
and power up of the device. The internal pull resistors are enabled on each I/O pin, as described in .
Table 3-2 describes the static operation states.
Table 3-2. Power Modes
VDD_IN ⁽¹⁾
VDD_IO ⁽¹⁾
nSHUTD⁽¹⁾ PM_MODE
Comments
1
None
None
Asserted Shut down
I/O state is undefined. No I/O voltages are allowed on nonfail-
safe pins.
2
None
None
Deasserted Not allowed
I/O state is undefined. No I/O voltages are allowed on nonfail-
safe pins.
3
None
Present
Asserted Shut down
I/Os are defined as 3-state with internal pullup or pulldown
enabled.
4
None
Present
Deasserted Not allowed
I/O state is undefined. No I/O voltages are allowed on nonfail-
safe pins.
5
Present
None
Asserted Shut down
I/O state is undefined. No I/O voltages are allowed on nonfail-
safe pins.
6
Present
None
Deasserted Not allowed
I/O state is undefined. No I/O voltages are allowed on nonfail-
safe pins.
7
Present
Present
Asserted Shut down
I/OS are defined as 3-state with internal pullup or pulldown
enabled.
8
Present
Present
Deasserted Active
See Section 3.3.4, I/O States In Various Power Modes.
(1) The terms None or Asserted can imply any of the following conditions: directly pulled to ground or driven low, pulled to ground through a
pulldown resistor, or left NC or floating (high-impedance output stage).
12
Detailed Description
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