CC1021-RTR1 datasheet(61/92 Pages) TI

61 / 92 page

CC1021

SWRS045

Page 61 of 91

LNA_EN and PA_EN are used to control

the external T/R switch.

22.2. General Purpose Output Control Pins

The two digital output pins, PA_EN and

LNA_EN, can be used as two general

control signals by setting EXT_PA = 0 and

EXT_LNA = 0. The output value is then

set directly by the value written to

EXT_PA_POL and EXT_LNA_POL.

The LOCK pin can also be used as a

general-purpose output pin. The LOCK pin

is controlled by LOCK_SELECT[3:0] in the

LOCK register. The LOCK pin is low when

LOCK_SELECT[3:0] = 0000, and high

when LOCK_SELECT[3:0] = 0001.

These features can be used to save I/O

pins on the microcontroller when the other

functions associated with these pins are

not used.

22.3. PA_EN and LNA_EN Pin Drive

Figure 35 shows the PA_EN and LNA_EN

pin drive currents. The sink and source

currents have opposite signs but absolute

values are used in Figure 35.

200

400

600

800

1000

1200

1400

Voltage on PA_EN/LNA_EN pin [V]

source current, 3 V

sink current, 3V

source current, 2.3 V

sink current, 2.3 V

source current, 3.6 V

sink current, 3.6 V

Figure 35. PA_EN and LNA_EN pin drive

23.

System Considerations and Guidelines

SRD regulations

International regulations and national laws

regulate the use of radio receivers and

transmitters. SRDs (Short Range Devices)

for license free operation are allowed to

operate in the 433 and 868 - 870 MHz

bands in most European countries. In the

United States, such devices operate in the

260 ñ 470 and 902 - 928 MHz bands. A

summary of the most important aspects of

these regulations can be found in

Application Note AN001 SRD regulations

for license free transceiver operation,

available from the Chipcon web site.

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