S2-LPS datasheet(4/73 Pages) STMICROELECTRONICS

4 / 73 page

The data to be transmitted can be provided by an external MCU either through the 128-byte TX FIFO writable via

SPI, or directly using a programmable GPIO pin. The S2-LPS supports frequency hopping, TX/RX and antenna

diversity switch control, extending the link range and improving performance.

The S2-LPS has a very efficient power management (PM) system. An integrated switched mode power supply

(SMPS) regulator allows operation from a battery voltage ranging from +1.8 V to +3.6 V, and with power

conversion efficiency of 90%.

A crystal must be connected between XIN and XOUT. It is digitally configurable to operate with different crystals.

As an alternative, an external clock signal can be used to feed XIN for proper operation. The S2-LPS also has an

integrated low-power RC oscillator, generating the 34.7 kHz signal used as a clock for the slowest timeouts.

A standard 4-pin SPI bus is used to communicate with the external MCU. Four configurable general purpose I/Os

are available.

S2-LPS

Detailed functional description

DS13831 - Rev 1

page 4/73

S2-LPS 数据表(PDF) 4 Page - STMicroelectronics