CC2500-RTY1 datasheet(52/96 Pages) TI

52 / 96 page

CC2500

SWRS040C

Page 52 of 89

29 General Purpose / Test Output Control Pins

The three digital output pins GDO0, GDO1 and

GDO2

are general control pins configured with

IOCFG0.GDO0_CFG,

IOCFG1.GDO1_CFG

and IOCFG2.GDO2_CFG respectively. Table

33 shows the different signals that can be

monitored on the GDO pins. These signals can

be used as inputs to the MCU. GDO1 is the

same pin as the SO pin on the SPI interface,

thus the output programmed on this pin will

only be valid when CSn is high. The default

value for GDO1 is 3-stated, which is useful

when the SPI interface is shared with other

devices.

The default value for GDO0 is a 135-141 kHz

clock output (XOSC frequency divided by 192).

Since the XOSC is turned on at power-on-

reset, this can be used to clock the MCU in

systems with only one crystal. When the MCU

is up and running, it can change the clock

frequency by writing to IOCFG0.GDO0_CFG.

An on-chip analog temperature sensor is

enabled by writing the value 128 (0x80) to the

IOCFG0.GDO0_CFG

the

GDO0

then

proportional

temperature. See Section 4.7 on page 14 for

temperature sensor specifications.

If the IOCFGx.GDO0_CFG setting is less than

0x20 and IOCFGx_GDOx_INV is 0 (1), the

GDO0

and GDO2 pins will be hardwired to 0 (1)

and the GDO1 pin will be hardwired to 1 (0) in

the SLEEP state. These signals will be

hardwired until the CHIP_RDYn signal goes

low.

If the IOCFGx.GDO0_CFG setting is 0x20 or

higher the GDO pins will work as programmed

also in SLEEP state. As an example, GDO1 is

high

impedance

all

states

IOCFG1.GDO0_CFG

=0x2E.

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