CC2480 datasheet(24/48 Pages) TI

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CC2480

9.2.1

Unused I/O pins

Unused I/O pins should have a defined level

and not be left floating. One way to do this is to

leave the pin unconnected and configured with

pull-up resistor. This is also the state of all pins

after reset.

9.2.2

Low I/O Supply Voltage

In applications where the digital I/O power

supply voltage pin DVDD is below 2.6 V, the

SC bit should be set to 1 in order to obtain

output DC characteristics specified in section

5.14. See the

CC2480 user guide [2] for a

description of how to do this.

9.2.3

General Purpose I/O

See the

CC2480 user guide [2] for a description

of how to configure and use the GPIO pins.

The output drive strength is 4 mA on all

outputs, except for the two high-drive outputs,

GPIO0 and GPIO1, which each have ~20 mA

output drive strength.

When used as an input, the general purpose

I/O port pins can be configured to have a pull-

up, pull-down or tri-state mode of operation. By

default, after a reset, inputs are configured as

inputs with pull-up. Please note that GPIO0

and GPIO1 do not have pull-up or pull-down

capabilities.

In power modes PM2 and PM3 the I/O pins

retain the I/O mode and output value (if

applicable) that was set when PM2/3 was

entered

CC2480 Data Sheet SWRS074

Page 24 of 43

CC2480 Datasheet(PDF) 24 Page - Texas Instruments