SI4455-C2A-GMR Datasheet, PDF (30/39 Pages) Silicon Laboratories – EASY-TO-USE, LOW-CURRENT OOK/(G)FSK SUB-GHZ TRANSCEIVER, TRANSMITTER, AND RECEIVER

Si4x55-C
5.4. GPIO
Four General Purpose IO (GPIO) pins are available for use in the application. The GPIOs are configured using the
GPIO_PIN_CFG command. GPIO pins 0 and 1 should be used for active signals such as data or clock. GPIO pins
2 and 3 have more susceptibility to generating spurious components in the synthesizer than pins 0 and 1. The drive
strength of the GPIO's can be adjusted with the GEN_CONFIG parameter in the GPIO_PIN_CFG command. By
default, the drive strength is set to the minimum. The default configuration and the state of the GPIO during
shutdown are shown in Table 14. For a complete list of the GPIO options, please refer to the EZRadio API
documentation zip file available from www.silabs.com.
Pin
GPIO0
GPIO1
GPIO2
GPIO3
nIRQ
SDO
SDI
SCLK
NSEL
Table 14. GPIOs
SDN State
0
0
0
0
Resistive V_DD pull-up
Resistive V_DD pull-up
High Z
High Z
High Z
POR Default
POR
CTS
POR
POR
nIRQ
SDO
SDI
SCLK
NSEL
30
Rev 1.0