S2-LPS datasheet(44/73 Pages) STMICROELECTRONICS

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Bit

Events group

Interrupt event

Packet oriented

TX FIFO almost full

TX FIFO almost empty

RX FIFO almost full

RX FIFO almost empty

Max. number of back-off during CCA

Signal quality related

Valid preamble detected

Sync word detected

RSSI above threshold (CS)

Device status related

Wake-up timeout in LDCR mode (1)

READY (2)

STANDBY state switching in progress

Low battery level

Power-on reset

Timer related

RX timer timeout

Sniff timer timeout

1. The interrupt flag n.15 is set (and consequently the interrupt request) only when the XO clock is available for the state

machine. This time may be delayed compared to the actual timer expiration. However, the real time event can be sensed

putting the end-of-counting signal on a GPIO output.

2. The interrupt flag n.16 is set each time the S2-LPS goes to READY state and the XO has completed its setting transient (XO

ready condition detected).

All interrupts are reported on a set of interrupt status registers and are individually maskable. The interrupt status

The status of all the interrupts are reported in the IRQ_STATUS register: bits are high for the events that have

generated any interrupts. The interrupts are individually maskable using the IRQ_MASK registers: if the mask bit

related to a particular event is programmed at 0, that event does not generate any interrupt request.

7.3

GPIOs

The four GPIOs can be configured as follows:

Table 48. 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 outputs a command information coming from the RADIO_TX block

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-LPS is transiting in the RX state

S2-LPS

GPIOs

DS13831 - Rev 1

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