CSM32RV20

@@ -0,0 +1,73 @@+# CSM32RV20++**Nanjing Zhongke Microelectronics** · Microcontrollers (MCU/MPU/SOC) · QFN-32-EP(4x4)++CSM32RV20 from Nanjing Zhongke Microelectronics, in a QFN-32-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 | PB1 | bidirectional | General-purpose I/O port B bit 1. No dedicated alternate function listed. |+| 2 | PB0 | bidirectional | General-purpose I/O port B bit 0. No dedicated alternate function listed. |+| 3 | PA15 | bidirectional | GPIO PA15. Muxable to TIMER2_CH4N, UART4_TX or EXTI[15]; also provides the RF detection input. |+| 4 | PA14 | bidirectional | GPIO PA14. Muxable to ADC trigger (ADC_TRI), TIMER2_CH4, UART4_RX or EXTI[14]. |+| 5 | PA13 | bidirectional | GPIO PA13. Muxable to TIMER2_CH3N or EXTI[13]; additional function: ADC voltage reference output REFP. |+| 6 | PA12 | bidirectional | GPIO PA12. Muxable to TIMER2_CH3 or EXTI[12]; additional function: PGA input. |+| 7 | PA11 | bidirectional | GPIO PA11. Muxable to TIMER2_BKIN, TIMER2_CH2N, UART3_TX or EXTI[11]; additional function: ADC voltage reference output REFN. |+| 8 | PA10 | bidirectional | GPIO PA10. Muxable to TIMER1_BKIN, TIMER2_CH2, UART3_RX or EXTI[10]; additional function: ADC_IN9. |+| 9 | PA9 | bidirectional | GPIO PA9. Muxable to TIMER1_CH1, UART1_TX, TIMER2_CH1N or EXTI[9]; additional function: ADC_IN8. |+| 10 | PA8 | bidirectional | GPIO PA8. Muxable to I2C SDA, UART1_RX, TIMER2_CH1 or EXTI[8]; additional function: ADC_IN7. |+| 11 | NRST | input | External reset input, active-low. Drive low to reset the MCU. |+| 12 | PA7 | bidirectional | GPIO PA7. Muxable to I2C SCL, SPI MOSI, TIMER1_CH4N or EXTI[7]; additional function: ADC_IN6. |+| 13 | PA6 | bidirectional | GPIO PA6. Muxable to UART1_TX, SPI MISO, TIMER1_CH4 or EXTI[6]; additional function: ADC_IN5. |+| 14 | PA5 | bidirectional | GPIO PA5. Muxable to UART1_RX, SPI SCK, TIMER1_CH3N or EXTI[5]; additional function: ADC_IN4. |+| 15 | PA4 | bidirectional | GPIO PA4. Muxable to SPI MOSI, TIMER1_CH1IN, TIMER1_CH3, UART2_TX or EXTI[4]; additional function: ADC_IN3. |+| 16 | PA3 | bidirectional | GPIO PA3. Muxable to SPI MISO, TIMER1_CH1N, TIMER1_CH2N, UART2_RX or EXTI[3]; additional function: ADC_IN2. |+| 17 | PA2 | bidirectional | GPIO PA2. Muxable to SPI SCK, TIMER1_CH1, TIMER1_CH2 or EXTI[2]. |+| 18 | PA1 | bidirectional | GPIO PA1. Muxable to cJTAG TMSC, I2C SDA, TIMER1_CH1N or EXTI[1]. |+| 19 | PA0 | bidirectional | GPIO PA0. Muxable to cJTAG TCKC, I2C SCL, TIMER1_CH1 or EXTI[0]. |+| 20 | VDD | power_in | Main power supply, 1.8-5.5 V (VDD ≤ 4.8 V for ADC full-scale operation). |+| 21 | PB13 | bidirectional | GPIO PB13; additional function OSC_OUT (external crystal drive output). |+| 22 | PB12 | bidirectional | GPIO PB12; additional function OSC_IN (external crystal input). |+| 23 | PB11 | bidirectional | GPIO PB11; additional function COMP3 negative input (COMP3-). |+| 24 | PB10 | bidirectional | GPIO PB10; additional function COMP3 positive input (COMP3+). |+| 25 | PB9 | bidirectional | GPIO PB9; additional function COMP2 negative input (COMP2-). |+| 26 | PB8 | bidirectional | GPIO PB8; additional function COMP2 positive input (COMP2+). |+| 27 | PB7 | bidirectional | GPIO PB7; additional function COMP1 negative input (COMP1-). |+| 28 | PB6 | bidirectional | GPIO PB6; additional function COMP1 positive input (COMP1+). |+| 29 | PB5 | bidirectional | General-purpose I/O port B bit 5. No dedicated alternate function listed on this variant (E77Q6). On the E77N6 variant this pin is VCAP instead. |+| 30 | PB4 | bidirectional | GPIO PB4; alternate function SPI2_MISO. |+| 31 | PB3 | bidirectional | GPIO PB3; alternate function SPI2_MOSI. |+| 32 | PB2 | bidirectional | GPIO PB2; alternate function SPI2_SCK. |+| 33 | VSS | power_in | Ground. Exposed thermal/ground pad on the bottom of the QFN package; must be soldered to PCB ground. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nanjing Zhongke Microelectronics |+| Package | QFN-32-EP(4x4) |+| Category | MCU |+| Pins | 33 |++## Ordering variants++- `CSM32RV20E77Q6`+- `CSM32RV20E77N6`++## CAD (KiCad official)++- Symbol: `CSM32RV20`+- Footprint: `Package_DFN_QFN:QFN-32-1EP_4x4mm_P0.4mm_EP2.9x2.9mm`+- 3D model: QFN-32-EP(4x4) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Nanjing Zhongke Microelectronics datasheet](docs/csm32rv20-datasheet.pdf) (235 pp, sha256 `c175e7d3b3828530`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/csm32rv20-datasheet.pdf)

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