# STM32L4S5QII6

**STMicroelectronics** · Microcontroller Units (MCUs/MPUs/SOCs) · UFBGA-132

STM32L4S5QII6 from STMicroelectronics, in a UFBGA-132. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model, then checked against ST open pin data); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| A1 | PE3 | bidirectional | 5 V-tolerant I/O (FT_l); alternate functions include TRACED0, TIM3_CH1, OCTOSPIM_P1_DQS, TSC_G7_IO2, SAI1_SD_B and EVENTOUT. |
| A2 | PE1 | bidirectional | 5 V-tolerant I/O; alternate functions include DCMI_D3, FMC_NBL1, TIM17_CH1 and EVENTOUT. |
| A3 | PB8 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include TIM4_CH3, SAI1_CK1, I2C1_SCL, CAN1_RX, SDMMC1_CKIN and TIM16_CH1. |
| A4 | PH3-BOOT0 | bidirectional | Dedicated BOOT0 pin (5 V-tolerant I/O, also PH3 with EVENTOUT); the BOOT0 input voltage range is 0 to 9 V. |
| A5 | PD7 | bidirectional | 5 V-tolerant I/O; alternate functions include DFSDM1_CKIN1, USART2_CK, OCTOSPIM_P1_IO7 and FMC_NCE/FMC_NE1. |
| A6 | PD5 | bidirectional | 5 V-tolerant I/O; alternate functions include USART2_TX, OCTOSPIM_P1_IO5 and FMC_NWE. |
| A7 | PB4 | bidirectional | 5 V-tolerant Fm+-capable I/O with analog switch supplied by VDDA (FT_fa); after reset it is the NJTRST debug pin with internal pull-up enabled, and COMP2_INP is an additional function. |
| A8 | PB3 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_la); alternate functions include JTDO/TRACESWO, TIM2_CH2, SPI1_SCK and SAI1_SCK_B, and COMP2_INM is an additional function. |
| A9 | PA15 | bidirectional | 5 V-tolerant I/O; after reset it is the JTDI debug pin with internal pull-up enabled, and alternate functions include TIM2_CH1, USART2_RX and SPI1_NSS. |
| A10 | PA14 | bidirectional | 5 V-tolerant I/O; after reset it is the JTCK/SWCLK debug pin with internal pull-down enabled, and alternate functions include LPTIM1_OUT and I2C1_SMBA. |
| A11 | PA13 | bidirectional | 5 V-tolerant I/O; after reset it is the JTMS/SWDIO debug pin with internal pull-up enabled, and alternate functions include IR_OUT and SAI1_SD_B. |
| A12 | PA12 | bidirectional | 5 V-tolerant I/O with USB function supplied by VDDUSB (FT_u); alternate functions include TIM1_ETR, SPI1_MOSI, USART1_RTS_DE, CAN1_TX and OTG_FS_DP. |
| B1 | PE4 | bidirectional | 5 V-tolerant I/O; alternate functions include TRACED1, TIM3_CH2, SAI1_D2, DFSDM1_DATIN3, DCMI_D4 and SAI1_FS_A. |
| B2 | PE2 | bidirectional | 5 V-tolerant I/O (FT_l); alternate functions include TRACECK, TIM3_ETR, SAI1_CK1, TSC_G7_IO1 and SAI1_MCLK_A. |
| B3 | PB9 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include IR_OUT, TIM4_CH4, SAI1_D2, I2C1_SDA, SPI2_NSS, CAN1_TX and TIM17_CH1. |
| B4 | PB7 | bidirectional | 5 V-tolerant Fm+-capable I/O with analog switch supplied by VDDA (FT_fla); alternate functions include LPTIM1_IN2, TIM4_CH2, I2C1_SDA, USART1_RX and TIM17_CH1N, and COMP2_INM and PVD_IN are additional functions. |
| B5 | PB6 | bidirectional | 5 V-tolerant Fm+-capable I/O with analog switch supplied by VDDA (FT_fa); alternate functions include LPTIM1_ETR, TIM4_CH1, I2C1_SCL, USART1_TX and TIM16_CH1N, and COMP2_INP is an additional function. |
| B6 | PD6 | bidirectional | 5 V-tolerant I/O; alternate functions include SAI1_D1, DCMI_D10, SPI3_MOSI, DFSDM1_DATIN1, USART2_RX and FMC_NWAIT. |
| B7 | PD4 | bidirectional | 5 V-tolerant I/O; alternate functions include SPI2_MOSI, DFSDM1_CKIN0, USART2_RTS_DE, OCTOSPIM_P1_IO4 and FMC_NOE. |
| B8 | PD3 | bidirectional | 5 V-tolerant I/O; alternate functions include SPI2_SCK, DCMI_D5, SPI2_MISO, DFSDM1_DATIN0, USART2_CTS_NSS and OCTOSPIM_P2_NCS. |
| B9 | PD1 | bidirectional | 5 V-tolerant I/O; alternate functions include SPI2_SCK, DFSDM1_CKIN7, CAN1_TX and FMC_D3. |
| B10 | PC12 | bidirectional | 5 V-tolerant I/O; alternate functions include TRACED3, SPI3_MOSI, USART3_CK, UART5_TX, DCMI_D9, SDMMC1_CK and SAI2_SD_B. |
| B11 | PC10 | bidirectional | 5 V-tolerant I/O; alternate functions include TRACED1, SPI3_SCK, USART3_TX, UART4_TX, DCMI_D8, SDMMC1_D2 and SAI2_SCK_B. |
| B12 | PA11 | bidirectional | 5 V-tolerant I/O with USB function supplied by VDDUSB (FT_u); alternate functions include TIM1_CH4, TIM1_BKIN2, SPI1_MISO, USART1_CTS_NSS, CAN1_RX and OTG_FS_DM. |
| C1 | PC13 | bidirectional | I/O supplied through the power switch, which sinks only 3 mA, so in output mode the speed must not exceed 2 MHz with a 30 pF maximum load and the pin must not be used as a current source. |
| C2 | PE5 | bidirectional | 5 V-tolerant I/O; alternate functions include TRACED2, TIM3_CH3, SAI1_CK2, DFSDM1_CKIN3, DCMI_D6 and SAI1_SCK_A. |
| C3 | PE0 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM4_ETR, DCMI_D2, FMC_NBL0, TIM16_CH1 and EVENTOUT. |
| C4 | VDD | power_in | Main supply for the I/Os, the internal regulator and system analog circuits, 1.71 V to 3.6 V. |
| C5 | PB5 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_la); alternate functions include LPTIM1_IN1, TIM3_CH2, I2C1_SMBA, SPI1_MOSI and USART1_CK, and COMP2_OUT is an additional function. |
| C6 | PG14 | bidirectional | 5 V-tolerant Fm+-capable I/O supplied only by VDDIO2 (FT_fs, 1.08 V to 3.6 V); alternate functions include I2C1_SCL and FMC_A25. |
| C7 | PG13 | bidirectional | 5 V-tolerant Fm+-capable I/O supplied only by VDDIO2 (FT_fs, 1.08 V to 3.6 V); alternate functions include I2C1_SDA, USART1_CK and FMC_A24. |
| C8 | PD2 | bidirectional | 5 V-tolerant I/O; alternate functions include TRACED2, TIM3_ETR, USART3_RTS_DE, UART5_RX, TSC_SYNC, DCMI_D11 and SDMMC1_CMD. |
| C9 | PD0 | bidirectional | 5 V-tolerant I/O; alternate functions include SPI2_NSS, DFSDM1_DATIN7, CAN1_RX and FMC_D2. |
| C10 | PC11 | bidirectional | 5 V-tolerant I/O; alternate functions include DCMI_D2, OCTOSPIM_P1_NCS, SPI3_MISO, USART3_RX, UART4_RX, SDMMC1_D3 and SAI2_MCLK_B. |
| C11 | VDDUSB | power_in | Independent USB transceiver supply, 3.0 V to 3.6 V when USB is used (0 to 3.6 V allowed when USB is not used). |
| C12 | PA10 | bidirectional | 5 V-tolerant Fm+-capable I/O with USB function supplied by VDDUSB (FT_flu); alternate functions include TIM1_CH3, SAI1_D1, USART1_RX, OTG_FS_ID and TIM17_BKIN. |
| D1 | PC14-OSC32_IN | bidirectional | I/O supplied through the power switch with the same 3 mA sink limit and 2 MHz / 30 pF output restriction as PC13; it is also the OSC32_IN LSE oscillator input. |
| D2 | PE6 | bidirectional | 5 V-tolerant I/O; alternate functions include TRACED3, TIM3_CH4, SAI1_D1, DCMI_D7 and SAI1_SD_A. |
| D3 | VSS | power_in | Ground reference for the digital supply and I/Os. |
| D4 | PF2 | bidirectional | 5 V-tolerant I/O; alternate functions include I2C2_SMBA, OCTOSPIM_P2_IO2, FMC_A2 and EVENTOUT. |
| D5 | PF1 | bidirectional | 5 V-tolerant Fm+-capable I/O; alternate functions include I2C2_SCL, OCTOSPIM_P2_IO1 and FMC_A1. |
| D6 | PF0 | bidirectional | 5 V-tolerant Fm+-capable I/O; alternate functions include I2C2_SDA, OCTOSPIM_P2_IO0 and FMC_A0. |
| D7 | PG12 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include LPTIM1_ETR, SPI3_NSS, USART1_RTS_DE and FMC_NE4. |
| D8 | PG10 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include LPTIM1_IN1, SPI3_MISO, USART1_RX, FMC_NE3 and TIM15_CH1. |
| D9 | PG9 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include SPI3_SCK, USART1_TX, FMC_NCE/FMC_NE2 and TIM15_CH1N. |
| D10 | PA9 | bidirectional | 5 V-tolerant Fm+-capable I/O with USB function supplied by VDDUSB (FT_flu); alternate functions include TIM1_CH2, SPI2_SCK, USART1_TX, SAI1_FS_A and TIM15_BKIN, and OTG_FS_VBUS is an additional function. |
| D11 | PA8 | bidirectional | 5 V-tolerant Fm+-capable I/O; alternate functions include MCO, TIM1_CH1, SAI1_CK2, USART1_CK and OTG_FS_SOF. |
| D12 | PC9 | bidirectional | 5 V-tolerant Fm+-capable I/O; alternate functions include TRACED0, TIM8_BKIN2, TIM3_CH4, DCMI_D3, I2C3_SDA, OTG_FS_NOE and SDMMC1_D1. |
| E1 | PC15-OSC32_OUT | bidirectional | I/O supplied through the power switch with the same 3 mA sink limit and 2 MHz / 30 pF output restriction as PC13; it is also the OSC32_OUT LSE oscillator output. |
| E2 | VBAT | power_in | Backup-domain supply, 1.55 V to 3.6 V, for the RTC, 32 kHz oscillator and backup registers when VDD is not present; RTC_TAMP3 and WKUP3 are additional functions on this ball. |
| E3 | VSS | power_in | Ground reference for the digital supply and I/Os. |
| E4 | PF3 | bidirectional | 5 V-tolerant I/O; alternate functions include OCTOSPIM_P2_IO3, FMC_A3 and EVENTOUT. |
| E9 | PG5 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include SPI1_NSS, LPUART1_CTS, FMC_A15 and SAI2_SD_B. |
| E10 | PC8 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM3_CH3, TIM8_CH3, TSC_G4_IO3, DCMI_D2 and SDMMC1_D0. |
| E11 | PC7 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM3_CH2, TIM8_CH2, DFSDM1_DATIN3, DCMI_D1, SDMMC1_D7 and SAI2_MCLK_B. |
| E12 | PC6 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM3_CH1, TIM8_CH1, DFSDM1_CKIN3, DCMI_D0, SDMMC1_D6 and SAI2_MCLK_A. |
| F1 | PH0-OSC_IN | bidirectional | 5 V-tolerant I/O; this ball is the OSC_IN high-speed crystal oscillator input. |
| F2 | VSS | power_in | Ground reference for the digital supply and I/Os. |
| F3 | PF4 | bidirectional | 5 V-tolerant I/O; alternate functions include OCTOSPIM_P2_CLK, FMC_A4 and EVENTOUT. |
| F4 | PF5 | bidirectional | 5 V-tolerant I/O; alternate functions include FMC_A5 and EVENTOUT. |
| F6 | VSS | power_in | Ground reference for the digital supply and I/Os. |
| F7 | VSS | power_in | Ground reference for the digital supply and I/Os. |
| F9 | PG3 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include SPI1_MISO, FMC_A13 and SAI2_FS_B. |
| F10 | PG4 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include SPI1_MOSI, FMC_A14 and SAI2_MCLK_B. |
| F11 | VSS | power_in | Ground reference for the digital supply and I/Os. |
| F12 | VSS | power_in | Ground reference for the digital supply and I/Os. |
| G1 | PH1-OSC_OUT | bidirectional | 5 V-tolerant I/O; this ball is the OSC_OUT high-speed crystal oscillator output. |
| G2 | VDD | power_in | Main supply for the I/Os, the internal regulator and system analog circuits, 1.71 V to 3.6 V. |
| G3 | PG11 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include LPTIM1_IN2, OCTOSPIM_P1_IO5, SPI3_MOSI, USART1_CTS_NSS and TIM15_CH2. |
| G4 | PG6 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include OCTOSPIM_P1_DQS, I2C3_SMBA and LPUART1_RTS_DE. |
| G6 | VDD | power_in | Main supply for the I/Os, the internal regulator and system analog circuits, 1.71 V to 3.6 V. |
| G7 | VDDIO2 | power_in | Supply for the PG[15:2] I/Os, 1.08 V to 3.6 V when at least one of these I/Os is used (0 V allowed when PG[15:2] are not used). |
| G9 | PG1 | bidirectional | 5 V-tolerant I/O; alternate functions include OCTOSPIM_P2_IO5, TSC_G8_IO4 and FMC_A11. |
| G10 | PG2 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include SPI1_SCK, FMC_A12 and SAI2_SCK_B. |
| G11 | VDD | power_in | Main supply for the I/Os, the internal regulator and system analog circuits, 1.71 V to 3.6 V. |
| G12 | VDD | power_in | Main supply for the I/Os, the internal regulator and system analog circuits, 1.71 V to 3.6 V. |
| H1 | PC0 | bidirectional | 5 V-tolerant Fm+-capable I/O with analog switch supplied by VDDA (FT_fla); alternate functions include LPTIM1_IN1, I2C3_SCL, LPUART1_RX and LPTIM2_IN1, and ADC1_IN1 is an additional function. |
| H2 | NRST | bidirectional | Bidirectional reset pin with embedded weak pull-up resistor. |
| H3 | VDD | power_in | Main supply for the I/Os, the internal regulator and system analog circuits, 1.71 V to 3.6 V. |
| H4 | PG7 | bidirectional | 5 V-tolerant Fm+-capable I/O supplied only by VDDIO2 (FT_fs, 1.08 V to 3.6 V); alternate functions include SAI1_CK1, I2C3_SCL, LPUART1_TX, FMC_INT and SAI1_MCLK_A. |
| H9 | PG0 | bidirectional | 5 V-tolerant I/O; alternate functions include OCTOSPIM_P2_IO4, TSC_G8_IO3 and FMC_A10. |
| H10 | PD15 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM4_CH4, LCD_B3 and FMC_D1. |
| H11 | PD14 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM4_CH3, LCD_B2 and FMC_D0. |
| H12 | PD13 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include TIM4_CH2, I2C4_SDA, TSC_G6_IO4, FMC_A18 and LPTIM2_OUT. |
| J1 | VSSA/VREF- | power_in | Analog ground; VREF- must always be equal to VSSA. |
| J2 | PC1 | bidirectional | 5 V-tolerant Fm+-capable I/O with analog switch supplied by VDDA (FT_fla); alternate functions include TRACED0, LPTIM1_OUT, SPI2_MOSI, I2C3_SDA and LPUART1_TX, and ADC1_IN2 is an additional function. |
| J3 | PC2 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_la); alternate functions include LPTIM1_IN2, SPI2_MISO, DFSDM1_CKOUT and OCTOSPIM_P1_IO5, and ADC1_IN3 is an additional function. |
| J4 | PA4 | bidirectional | 3.6 V-tolerant I/O with analog switch supplied by VDDA (TT_a); alternate functions include OCTOSPIM_P1_NCS, SPI1_NSS, SPI3_NSS and USART2_CK, and ADC1_IN9 and DAC1_OUT1 are additional functions. |
| J5 | PA7 | bidirectional | 5 V-tolerant Fm+-capable I/O with analog switch supplied by VDDA (FT_fla); alternate functions include TIM1_CH1N, TIM3_CH2, I2C3_SCL, SPI1_MOSI and OCTOSPIM_P1_IO2, and OPAMP2_VINM and ADC1_IN12 are additional functions. |
| J6 | PG8 | bidirectional | 5 V-tolerant Fm+-capable I/O supplied only by VDDIO2 (FT_fs, 1.08 V to 3.6 V); alternate functions include I2C3_SDA and LPUART1_RX. |
| J7 | PF12 | bidirectional | 5 V-tolerant I/O; alternate functions include OCTOSPIM_P2_DQS, LCD_B0 and FMC_A6. |
| J8 | PF14 | bidirectional | 5 V-tolerant Fm+-capable I/O; alternate functions include I2C4_SCL, DFSDM1_CKIN6, TSC_G8_IO1, LCD_G0 and FMC_A8. |
| J9 | PF15 | bidirectional | 5 V-tolerant Fm+-capable I/O; alternate functions include I2C4_SDA, TSC_G8_IO2, LCD_G1 and FMC_A9. |
| J10 | PD12 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include TIM4_CH1, I2C4_SCL, USART3_RTS_DE, FMC_A17, SAI2_FS_A and LPTIM2_IN1. |
| J11 | PD11 | bidirectional | 5 V-tolerant I/O; alternate functions include I2C4_SMBA, USART3_CTS_NSS, FMC_A16, SAI2_SD_A and LPTIM2_ETR. |
| J12 | PD10 | bidirectional | 5 V-tolerant I/O; alternate functions include USART3_CK, TSC_G6_IO1, FMC_D15 and SAI2_SCK_A. |
| K1 | PG15 | bidirectional | 5 V-tolerant I/O supplied only by VDDIO2 (FT_s, 1.08 V to 3.6 V); alternate functions include LPTIM1_OUT, I2C1_SMBA, OCTOSPIM_P2_DQS and DCMI_D13. |
| K2 | PC3 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_a); alternate functions include LPTIM1_ETR, SAI1_D1, SPI2_MOSI, OCTOSPIM_P1_IO6 and LPTIM2_ETR, and ADC1_IN4 is an additional function. |
| K3 | PA2 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_la); alternate functions include TIM2_CH3, USART2_TX, LPUART1_TX, OCTOSPIM_P1_NCS and TIM15_CH1, and ADC1_IN7 and WKUP4/LSCO are additional functions. |
| K4 | PA5 | bidirectional | 3.6 V-tolerant I/O with analog switch supplied by VDDA (TT_a); alternate functions include TIM2_CH1, TIM2_ETR, TIM8_CH1N, SPI1_SCK and LPTIM2_ETR, and ADC1_IN10 and DAC1_OUT2 are additional functions. |
| K5 | PC4 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_a); alternate functions include USART3_TX and OCTOSPIM_P1_IO7, and COMP1_INM and ADC1_IN13 are additional functions. |
| K6 | PF11 | bidirectional | 5 V-tolerant I/O; alternate functions include LCD_DE, DCMI_D12, DSI_TE and EVENTOUT. |
| K7 | PF13 | bidirectional | 5 V-tolerant I/O; alternate functions include I2C4_SMBA, DFSDM1_DATIN6, LCD_B1 and FMC_A7. |
| K8 | PD9 | bidirectional | 5 V-tolerant I/O; alternate functions include USART3_RX, DCMI_PIXCLK, LCD_R4, FMC_D14 and SAI2_MCLK_A. |
| K9 | PD8 | bidirectional | 5 V-tolerant I/O; alternate functions include USART3_TX, DCMI_HSYNC, LCD_R3, FMC_D13 and EVENTOUT. |
| K10 | PB15 | bidirectional | 5 V-tolerant I/O; alternate functions include RTC_REFIN, TIM1_CH3N, TIM8_CH3N, SPI2_MOSI, TSC_G1_IO4, SAI2_SD_A and TIM15_CH2. |
| K11 | PB14 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include TIM1_CH2N, I2C2_SDA, SPI2_MISO, DFSDM1_DATIN2, USART3_RTS_DE and TIM15_CH1. |
| K12 | PB13 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include TIM1_CH1N, I2C2_SCL, SPI2_SCK, USART3_CTS_NSS, LPUART1_CTS and TIM15_CH1N. |
| L1 | VREF+ | power_in | Positive reference voltage for ADC and DAC: 2 V to VDDA when VDDA is 2 V or higher, and equal to VDDA when VDDA is below 2 V; it is also the VREFBUF_OUT output when the internal buffer is enabled. |
| L2 | PA0 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_a); alternate functions include TIM2_CH1, TIM5_CH1, TIM8_ETR, USART2_CTS_NSS and UART4_TX, and OPAMP1_VINP, ADC1_IN5, RTC_TAMP2 and WKUP1 are additional functions. |
| L3 | PA3 | bidirectional | 3.6 V-tolerant I/O with analog switch supplied by VDDA (TT_a); alternate functions include TIM2_CH4, TIM5_CH4, SAI1_CK1, USART2_RX and LPUART1_RX, and OPAMP1_VOUT and ADC1_IN8 are additional functions. |
| L4 | PA6 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_a); alternate functions include TIM1_BKIN, TIM3_CH1, TIM8_BKIN, DCMI_PIXCLK, SPI1_MISO, USART3_CTS_NSS and LPUART1_CTS, and OPAMP2_VINP and ADC1_IN11 are additional functions. |
| L5 | PC5 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_a); alternate functions include SAI1_D3 and USART3_RX, and COMP1_INP, ADC1_IN14 and WKUP5 are additional functions. |
| L6 | PB2 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_a); alternate functions include RTC_OUT, LPTIM1_OUT, I2C3_SMBA, DFSDM1_CKIN0 and OCTOSPIM_P1_DQS, and COMP1_INP is an additional function. |
| L7 | PE8 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_CH1N, DFSDM1_CKIN2, LCD_B7, FMC_D5 and SAI1_SCK_B. |
| L8 | PE10 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_CH2N, DFSDM1_DATIN4, TSC_G5_IO1, OCTOSPIM_P1_CLK, FMC_D7 and SAI1_MCLK_B. |
| L9 | PE12 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_CH3N, SPI1_NSS, DFSDM1_DATIN5, TSC_G5_IO3, OCTOSPIM_1_IO0 and FMC_D9. |
| L10 | PB10 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include TIM2_CH3, I2C4_SCL, I2C2_SCL, SPI2_SCK, USART3_TX, LPUART1_RX, OCTOSPIM_P1_CLK and COMP1_OUT. |
| L11 | PB11 | bidirectional | 5 V-tolerant Fm+-capable I/O (FT_fl); alternate functions include TIM2_CH4, I2C4_SDA, I2C2_SDA, DFSDM1_CKIN7, USART3_RX, LPUART1_TX and COMP2_OUT. |
| L12 | PB12 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_BKIN, I2C2_SMBA, SPI2_NSS, DFSDM1_DATIN1, USART3_CK, LPUART1_RTS_DE and SAI2_FS_A. |
| M1 | VDDA | power_in | Analog supply, 1.62 V (ADC/COMP) or 1.8 V (DAC/OPAMP) to 3.6 V, with 2.4 V required when the voltage reference buffer is used. |
| M2 | PA1 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_la); alternate functions include TIM2_CH2, TIM5_CH2, I2C1_SMBA, SPI1_SCK, USART2_RTS_DE, UART4_RX and TIM15_CH1N, and OPAMP1_VINM and ADC1_IN6 are additional functions. |
| M3 | OPAMP1_VINM | input | Inverting input of OPAMP1; input-only pin with a 3.6 V-tolerant structure (TT). |
| M4 | OPAMP2_VINM | input | Inverting input of OPAMP2; input-only pin with a 3.6 V-tolerant structure (TT). |
| M5 | PB0 | bidirectional | 3.6 V-tolerant I/O with LCD and analog switch functions (TT_la); alternate functions include TIM1_CH2N, TIM3_CH3, TIM8_CH2N, SPI1_NSS, USART3_CK and COMP1_OUT, and OPAMP2_VOUT and ADC1_IN15 are additional functions. |
| M6 | PB1 | bidirectional | 5 V-tolerant I/O with analog switch supplied by VDDA (FT_a); alternate functions include TIM1_CH3N, TIM3_CH4, TIM8_CH3N, DFSDM1_DATIN0, USART3_RTS_DE and LPUART1_RTS_DE, and COMP1_INM and ADC1_IN16 are additional functions. |
| M7 | PE7 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_ETR, DFSDM1_DATIN2, LCD_B6, FMC_D4 and SAI1_SD_B. |
| M8 | PE9 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_CH1, DFSDM1_CKOUT, LCD_G2, FMC_D6 and SAI1_FS_B. |
| M9 | PE11 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_CH2, DFSDM1_CKIN4, TSC_G5_IO2, OCTOSPIM_P1_NCS and FMC_D8. |
| M10 | PE13 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_CH3, SPI1_SCK, DFSDM1_CKIN5, TSC_G5_IO4, OCTOSPIM_P1_IO1 and FMC_D10. |
| M11 | PE14 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_CH4, TIM1_BKIN2, SPI1_MISO, OCTOSPIM_P1_IO2 and FMC_D11. |
| M12 | PE15 | bidirectional | 5 V-tolerant I/O; alternate functions include TIM1_BKIN, SPI1_MOSI, OCTOSPIM_P1_IO3 and FMC_D12. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | UFBGA-132 |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 132 |

## CAD (KiCad official)

- Symbol: `STM32L4S5QII6`
- Footprint: `Package_BGA:UFBGA-132_7x7mm_P0.5mm`
- 3D model: UFBGA-132 (KiCad packages3D, STEP)
- 3D model files: `stm32l4s5qii6-etched.step` / `stm32l4s5qii6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32l4s5qii6.step` / `stm32l4s5qii6.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588951815719702528) (273 pp, sha256 `09c1f7f04962417f`, retrieved 2026-10-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (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](docs/stm32l4s5qii6-datasheet.pdf)