S2-LP datasheet(74/90 Pages) STMICROELECTRONICS

74 / 90 page

MCU interface

S2-LP

74/90

DocID029944 Rev 1

9.3

GPIOs

The four GPIOs can be configured as follows:

Table 57: GPIO digital output functions

I/O

selection

Output signal

nIRQ (interrupt request, active low)

POR inverted (active low)

Wake-

up timer expiration: ‘1’ when WUT has expired

Low battery detection: ‘1’ when battery is below threshold setting

TX data internal clock output (TX data are sampled on the rising edge of it)

TX state indication: ‘1’ when the S2-LP is transiting in the TX state

TX/RX FIFO almost empty flag

TX/RX FIFO almost full flag

RX data output

RX clock output (recovered from received data)

RX state indication: ‘1’ when the S2-LP is transiting in the RX state

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

enable an external TCXO)

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

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