SI4313 datasheet(39/52 Pages) SILABS

39 / 52 page

Si4313-B1

Rev. 0.5

8.6. GPIO Configuration

Three general purpose IOs (GPIOs) are available. Numerous functions such as specific interrupts, TRSW

controlAntenna Diversity Switch control, Microcontroller Output, etc. can be routed to the GPIO pins as shown in

the tables below. When in Shutdown mode all the GPIO pads are pulled low.

Note: The ADC should not be selected as an input to the GPIO in standby or sleep modes and will cause excess current con-

sumption.

The GPIO settings for GPIO1 and GPIO2 are the same as for GPIO0 with the exception of the 00000 default

setting. The default settings for each GPIO are listed below:

For a complete list of the available GPIOs see “AN440: EZRadioPRO Detailed Register Descriptions”.

The GPIO drive strength may be adjusted with the gpioXdrv[1:0] bits. Setting a higher value will increase the drive

strength and current capability of the GPIO by changing the driver size. Special care should be taken in setting the

drive strength and loading on GPIO2 when the microcontroller clock is used. Excess loading or inadequate drive

may contribute to increased spurious emissions.

Add R/W Function/Des

cription

POR Def.

R/W

GPIO0

Configuration

gpio0drv[1] gpio0drv[0]

pup0

gpio0[4]

gpio0[3] gpio0[2] gpio0[1] gpio0[0]

00h

R/W

GPIO1

Configuration

gpio1drv[1] gpio1drv[0]

pup1

gpio1[4]

gpio1[3] gpio1[2] gpio1[1] gpio1[0]

00h

R/W

GPIO2

Configuration

gpio2drv[1] gpio2drv[0]

pup2

gpio2[4]

gpio2[3] gpio2[2] gpio2[1] gpio2[0]

00h

R/W

I/O Port

Configuration

extitst[2]

extitst[1] extitst[0]

itsdo

dio2

dio1

dio0

00h

GPIO

00000—Default Setting

GPIO0

POR

GPIO1

POR Inverted

GPIO2

Microcontroller Clock

SI4313 Datasheet(PDF) 39 Page - Silicon Laboratories

SI4313 Datasheet(HTML) 39 Page - Silicon Laboratories

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Datasheet Download

Link URL