S2-LPSQTR datasheet(45/73 Pages) STMICROELECTRONICS

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I/O selection

Output signal

Device in a state other than SLEEP or STANDBY: ‘0’ when in SLEEP/STANDBY

Device in STANDBY state

Antenna switch signal used for antenna diversity

Valid preamble detected flag

Sync word detected flag

RSSI above threshold (same indication of CS register)

Reserved

TX or RX mode indicator (to enable an external range extender)

VDD (to emulate an additional GPIO of the MCU, programmable by SPI)

GND (to emulate an additional GPIO of the MCU, programmable by SPI)

External SMPS enable signal (active high)

Device in SLEEP state

Device in READY state

Device in LOCK state

Device waiting for a high level of the lock-detector output signal

TX_DATA_OOK signal (internal control signal generated in the OOK analog smooth mode)

Device waiting for a high level of the READY2 signal from XO

Device waiting for timer expiration to allow PM block settling

Device waiting for end of VCO calibration

Device enables the full circuitry of the SYNTH block

Reserved

Table 49. GPIO digital input functions

I/O selection

Input signal

1 >> TX command

1 >> RX command

TX data input for direct modulation

Wake-up from external input (sensor output)

External clock @ 34.7 kHz (used for LDC modes timing)

From 5 to 31

Not used

S2-LPS

GPIOs

DS13831 - Rev 1

page 45/73

S2-LPSQTR Datasheet(PDF) 45 Page - STMicroelectronics