CH32V303
32-bit RISC-V MicrocontrollerThe CH32V303 is a 32-bit risc-v microcontroller from WCH. View the full CH32V303 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
CH32V303 shares its datasheet with CH32V307, whose page lists every part number it covers.
Official CH32V303 datasheet (PDF) — the source this page was extracted from.
Manufacturer
WCHCategory
Microcontrollers (MCU)CH32V303 Key Specifications
| Parameter | Value |
|---|---|
| ADC | 2x 12-bit, 16 external + 2 internal channels, dual conversion mode |
| DAC | 2x 12-bit |
| DMA | 2 controllers, 18 channels |
| GPIO | Up to 80 I/O pins |
| Timers | 4 advanced timers, 4 general-purpose timers, 2 basic timers, 2 watchdogs |
| CPU Core | QingKe V4F 32-bit RISC-V (IMAFC, single-precision FPU) |
| Touch Keys | 16 channels |
| Low-Power Modes | Sleep, Stop, Standby |
| OPA/Comparators | 4 groups |
| GPIO Supply VI/O | 3.3V |
| Max System Clock | 144MHz, zero wait |
| Supply Voltage VDD | 3.3V |
| Internal Oscillators | 8MHz HSI, ~40kHz LSI |
| SRAM (V303 Variants) | 32KB or 64KB |
| Operating Temperature | -40°C to 85°C |
| Communication Interfaces | Up to 8 USART/UART, 3 SPI (2 I2S), 2 I2C, CAN, USB 2.0 full-speed, SDIO, FSMC |
| CodeFlash (V303 Variants) | 128KB or 256KB |
CH32V303 Overview
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
CH32V303 Electrical Characteristics
Table 4-41 ADC characteristics
| Symbol | Parameter | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| V DDA | Supply voltage | 2.4 | 3.6 | V | ||
| V REF+ | Positive reference voltage | V REF+ cannot be more thanV DDA | 2.4 | V DDA | V | |
| I VREF | Reference current | 160 | 220 | μA | ||
| I DDA | Supply current | 480 | 530 | μA | ||
| f ADC | ADC clock frequency | 14 | MHz | |||
| f S | Sampling rate | 0.05 | 1 | MHz | ||
| f TRIG | External trigger frequency | 16 | 1/f ADC | |||
| V AIN | Conversion voltage range | 0 | V REF+ | V | ||
| R AIN | External input impedance | 50 | kΩ | |||
| R ADC | Sampling switch resistance | 0.6 | 1 | kΩ | ||
| C ADC | Internal sample and hold capacitor | 8 | pF |
Table 4-41 ADC characteristics
V3.5 79
| t CAL | Calibration time | 1/f ADC | ||
|---|---|---|---|---|
| t Iat | Injected trigger conversion latency | 2 | 1/f ADC | |
| t Iatr | Regular trigger conversion latency | 2 | 1/f ADC | |
| t s | Sampling time | 1.5 | 239.5 | 1/f ADC |
| t STAB | Power-on time | 1 | us | |
| t CONV | Total conversion time (including sampling time) | 14 | 252 | 1/f ADC |
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
| Symbol | Parameter | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| EO | Offset error | f PCLK2 = 56MHz, | ±4 | LSB | ||
| ED | Differential nonlinearity error | f ADC = 14MHz, | ±0.5 | ±3 | LSB | |
| EL | Integral nonlinearity error | R AIN < 10kΩ,V DDA = 3.3V | ±1 | ±4 | LSB |
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
CH32V303 Absolute Maximum Ratings
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
| Symbol | Description | Description | Min. | Max. | Unit |
|---|---|---|---|---|---|
| T A | Ambient temperature during operation | Ambient temperature during operation | -40 | 85 | °C |
| T S | Ambient temperature during storage | Ambient temperature during storage | -40 | 125 | °C |
| V DD -V SS | External main supply voltage (includingV DDA and V DD ) | External main supply voltage (includingV DDA and V DD ) | -0.3 | 4.0 | V |
| V I/O -V SS | I/O supply voltage | I/O supply voltage | -0.3 | 4.0 | V |
| V DD_ETH -V SS | Internal 10/100M Ethernet PHY supply voltage | CH32V317 | -0.3 | 4.0 | V |
| V DDK | Voltage at decoupling end of internal power supply LDO | CH32V317 | -0.2 | 1.5 | V |
| V IN | Input voltage on the FT (5V tolerance) pin | Input voltage on the FT (5V tolerance) pin | V SS -0.3 | 5.5 | V |
| V IN | 10/100M Ethernet PHY differential pin | V SS -0.3 | V DD_ETH +0.3 | V | V |
| V IN | Input voltage onPHY pin of USB and 10M Ethernet | Input voltage onPHY pin of USB and 10M Ethernet | V SS -0.3 | V DD +0.3 | V |
| V IN | Input voltage on other pins | Input voltage on other pins | V SS -0.3 | V IO +0.3 | V |
| \ | △ V DD_x \ | Variations between different main power supply pins | Variations between different main power supply pins | ||
| \ | △ V I/O_x \ | Variations between different I/O power supply pins | Variations between different I/O power supply pins | ||
| \ | △ V SS_x \ | Variations between different ground pins | Variations between different ground pins | ||
| V ESD(HBM) | Electrostatic discharge voltage (HBM, non-contact) | Electrostatic discharge voltage (HBM, non-contact) | 4K | 4K | V |
| V ESD(HBM) | USB pins (PA11, PA12) | USB pins (PA11, PA12) | 3K | 3K | V |
Table 4-1 Absolute maximum ratings
V3.5 52
| I VDD | Total current intoV DD /V DDA /V IO power lines (source) | 150 | mA |
|---|---|---|---|
| I Vss | Total current out ofV SS ground lines (sink) | 150 | mA |
| I I/O | Sink current on any I/O and control pin | 25 | mA |
| I I/O | Source current on any I/O and control pin | -25 | mA |
| I INJ(PIN) | Injected current on NRST pin | +/-5 | mA |
| I INJ(PIN) | Injected current on HSE's OSC_IN pin and LSE's OSC_IN pin | +/-5 | mA |
| I INJ(PIN) | Injected current on other pins | +/-5 | mA |
| ∑I INJ(PIN) | Total injected current on all I/Os and control pins | +/-25 | mA |
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
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All Microcontrollers (MCU) datasheetsAll WCH datasheets (94)
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