Part: CH32V303/305/307/317 Series — WCH (WCH-IC.com)

Type: 32-bit RISC-V Microcontroller

Description: Industrial-grade general-purpose microcontroller based on QingKe RISC-V4F core, operating at up to 144 MHz with single-precision FPU, up to 480 KB CodeFlash, up to 128 KB SRAM, and rich peripherals including USB2.0 HS PHY, Gigabit Ethernet MAC, and dual ADCs/DACs.

Operating Conditions:

• Supply voltage: 3.3V
• Operating temperature: -40 to 85 °C
• CPU main frequency: Max 144 MHz

Absolute Maximum Ratings:

Key Specs:

• Core: QingKe 32-bit RISC-V4F with FPU
• System main frequency: 144 MHz (zero wait)
• CodeFlash: Up to 480 KB (zero-wait application area + non-zero-wait data area)
• SRAM: Up to 128 KB
• ADC: 2 units, 12-bit, 16 external channels + 2 internal signals
• DAC: 2 units, 12-bit
• USB: USB2.0 full-speed host/device, USB2.0 high-speed host/device (built-in 480Mbps PHY)
• Ethernet: Gigabit Ethernet MAC controller, 10M PHY transceiver (CH32V307), 10/100M PHY transceiver (CH32V317)
• GPIO: Up to 80 I/O ports

Features:

• Fast programmable interrupt controller + hardware interrupt stack
• Single cycle multiplication, hardware division, hardware FPU
• Built-in factory-trimmed 8MHz RC oscillator and 40 kHz RC oscillator
• Multiple timers: 4 advanced, 4 general-purpose, 2 basic, 2 watchdog, 64-bit SysTick
• 8 USART interfaces (including 5 UARTs)
• 2 I2C interfaces (support SMBus/PMBus)
• 3 SPI interfaces (SPI2, SPI3 for I2S2, I2S3)
• 2 CAN interfaces (2.0B active)
• SDIO host interface (MMC, SD/SDIO, CE-ATA)
• Digital video port (DVP)
• CRC unit, 96-bit unique ID
• 2-wire serial debug interface (SDI)

Applications:

• Industrial-grade general-purpose applications

Package:

• LQFP
• QFN
• TSSOP

CH32V307 Pinout

Package: LQFP100 (CH32V307VCT6) / BGA100 (CH32V307WCU6)

LQFP100 (CH32V307VCT6)

BGA100 (CH32V307WCU6)

Notes

• The LQFP100 pinout (CH32V307VCT6) is extracted from the left diagram in the source image.
• The BGA100 pinout (CH32V307WCU6) is extracted from the right diagram; many BGA positions (18–34, 52–73) could not be clearly read from the provided image and are marked as "?".
• Power pins are color-coded in the diagram: red = VDD, black = VIO, blue = VDD & VBAT.
• Pins with alternate functions (e.g., PA12/USBHDP) support multiple peripheral modes; the primary GPIO designation is listed first.
• VBAT (Pin 6, LQFP) and VIBAT (Pin 1, BGA) are battery backup power supplies.
• NRST is active-low; external pull-up and filtering capacitor recommended.

Table 4-41 ADC characteristics

Table 4-41 ADC characteristics

V3.5 79

Note: Above parameters are guaranteed by design.

Formula: Maximum RAIN

The above formula is used to determine the maximum external impedance so that the error can be less than 1/4 LSB. Where N=12 (representing 12-bit resolution).

Table 4-42 Maximum RAIN when fADC = 14MHz

• T S (cycle) t S (us) Maximum R AIN (kΩ)
• 1.5 0.11 0.4
• 7.5 0.54 5.9
• 13.5 0.96 11.4
• 28.5 2.04 25.2
• 41.5 2.96 37.2
• 55.5 3.96 50
• 71.5 5.11 Invalid
• 239.5 17.1 Invalid

Table 4-43 ADC error

Cp represents the parasitic capacitance on the PCB and the pad (about 5pF), which may be related to the quality of the pad and PCB layout. A larger Cp value will reduce the conversion accuracy, the solution is to reduce the f ADC value.

V3.5 80

Figure 4-29 ADC typical connection diagram

Figure 4-30 Analog power supply and decoupling circuit reference

Stresses at or above the absolute maximum ratings listed in the table below may cause permanent damage to the device.

Table 4-1 Absolute maximum ratings

Table 4-1 Absolute maximum ratings

V3.5 52

No ordering information (MPN, package, temperature range, packing) was found in the provided datasheet section. Only a package type (TSSOP20) was mentioned.