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SPIRIT1QTR

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STMicroelectronics RF Transceiver ICs, QFN-20-EP(4x4). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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Datasheet

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Contents

README

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SPIRIT1QTR

STMicroelectronics · RF Transceiver ICs · QFN-20-EP(4x4)

SPIRIT1QTR from STMicroelectronics, in a QFN-20-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 GPIO_0 bidirectional Configurable general purpose I/O programmable for MCU clock output, FIFO status flags, wake-up input, battery level detector, TX-RX external switch control, antenna diversity control, or temperature sensor output; 0-VDD V operating range.
2 MISO output SPI data output pin for serial peripheral interface slave read operations; 0-3.9 V operating range.
3 MOSI input SPI data input pin for serial peripheral interface slave write operations; 0-3.9 V operating range.
4 SCLK input SPI clock input pin from master; 0-3.9 V operating range.
5 CSn input SPI chip select input pin, active low for slave selection; 0-3.9 V operating range.
6 XOUT output Crystal oscillator output connected to external 26 MHz crystal or left floating when using external clock on XIN; 0-1.4 V operating range.
7 XIN input Crystal oscillator input connected to external 26 MHz crystal or external clock source with DC coupling at 0.2 VDC nominal and minimum 400 mVpp AC amplitude; 0-1.4 V instantaneous maximum.
8 VBAT power_in Power supply input voltage with +1.8 V to +3.6 V operating range.
9 RXp input Differential RF input signal positive terminal for low-noise amplifier; 0-1.4 V operating range.
10 RXn input Differential RF input signal negative terminal for low-noise amplifier; 0-1.4 V operating range.
11 GND_PA power_in Ground pin for power amplifier that must be carefully decoupled from other ground pins; -0.3 to 3.9 V absolute maximum.
12 TX output RF output signal from transmitter to antenna via external matching network; 0-3.9 V operating range.
13 SMPS Ext2 power_in Regulated DC-DC voltage input to external switching mode power supply; 0-1.8 V operating range.
14 SMPS Ext1 power_out DC-DC output pin from internal switching mode power supply connected to external LC filter; 0-3.9 V operating range.
15 SDN input Shutdown input pin that must be 0 in all modes except shutdown; when SDN=1 the SPIRIT1 is shut down and register contents are lost, GPIO and SPI in HiZ; 0-VDD V operating range.
16 VBAT power_in Power supply input voltage with +1.8 V to +3.6 V operating range.
17 VREG power_out Regulated output voltage of 1.8 V for SPIRIT1 internal use only, requires 100 nF decoupling capacitor and cannot supply other devices; -0.3 to 1.4 V absolute maximum.
18 GPIO3 bidirectional Configurable general purpose I/O programmable for MCU clock output, FIFO status flags, wake-up input, battery level detector, TX-RX external switch control, antenna diversity control, or temperature sensor output; 0-VDD V operating range.
19 GPIO2 bidirectional Configurable general purpose I/O programmable for MCU clock output, FIFO status flags, wake-up input, battery level detector, TX-RX external switch control, antenna diversity control, or temperature sensor output; 0-VDD V operating range.
20 GPIO1 bidirectional Configurable general purpose I/O programmable for MCU clock output, FIFO status flags, wake-up input, battery level detector, TX-RX external switch control, antenna diversity control, or temperature sensor output; 0-VDD V operating range.
21 GND power_in Ground connection and exposed pad for heat dissipation and ground reference; -0.3 to 3.9 V absolute maximum.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package QFN-20-EP(4x4)
Category RF And Wireless
Pins 21

CAD (KiCad official)

  • Symbol: SPIRIT1QTR
  • Footprint: Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm
  • 3D model: QFN-20-EP(4x4) (KiCad packages3D, STEP)
  • 3D model files: spirit1qtr-etched.step / spirit1qtr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); spirit1qtr.step / spirit1qtr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (104 pp, sha256 2ed30e6860d67a45, retrieved 2026-09-23, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF