LLCC68 datasheet(76/106 Pages) SEMTECH

76 / 106 page

LLCC68

Data Sheet

Rev. 1.0

DS.LLCC68.W.APP

July 2019

76 of 106

Semtech

www.semtech.com

13.3.5 SetDIO2AsRfSwitchCtrl

This command is used to configure DIO2 so that it can be used to control an external RF switch.

When controlling the external RX switch, the pin DIO2 will toggle accordingly to the internal state machine. DIO2 will be

asserted high a few microseconds before the ramp-up of the PA and will be set to zero after the ramp-down of the PA.

The enable byte definition is given as follows:

13.3.6 SetDIO3AsTCXOCtrl

This command is used to configure the chip for an external TCXO reference voltage controlled by DIO3.

When this command is used, the device now controls the TCXO itself through DIO3. When needed (in mode STDBY_XOSC,

FS, TX and RX), the internal state machine will set DIO3 to a predefined output voltage (control through the parameter

tcxoVoltage). Internally, the clock controller will wait for the 32 MHz to appear before releasing the internal state machine.

The time needed for the 32 MHz to appear and stabilize can be controlled through the parameter delay(23:0). If the 32 MHz

from the TCXO is not detected internally at the end the delay period, the error XOSC_START_ERR will be flagged in the error

controller.

The XOSC_START_ERR flag will be raised at POR or at wake-up from Sleep mode in a cold-start condition, when a TCXO is

used. It is an expected behaviour since the chip is not yet aware of being clocked by a TCXO. The user should simply clear

this flag with the ClearDeviceErrors command.

Table 13-32: SetDIO2AsRfSwitchCtrl SPI Transaction

Byte

Data from host

Opcode = 0x9D

enable

Table 13-33: Enable Configuration Definition

Enable

Description

DIO2 is free to be used as an IRQ

DIO2 is selected to be used to control an RF switch. In this case:

DIO2 = 0 in SLEEP, STDBY_RX, STDBY_XOSC, FS and RX modes, DIO2 = 1 in TX mode

Table 13-34: SetDIO3asTCXOCtrl SPI Transaction

Byte

2-4

Data from host

Opcode = 0x97

tcxoVoltage

delay(23:0)

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