SimpleMethod/STM32-MCP9803

MCP9800/1/2/3 I2C High-Accuracy Temperature Sensor on STM32

MCP9800 1/2/3

STM32 library for high-accuracy temperature sensor using HAL and I2C.

Example:

/* USER CODE BEGIN 2 */
mcp9803 = mcp9803_Init(&hi2c2, MCP9803_DEFAULT_ADDRESS, MCP9803_COMPARATOR_MODE,
                       MCP9803_ALERT_POLARITY_DISABLED, MCP9803_FAULT_QUEUE_1,
                       ADC_RESOLUTION_12_BIT, MCP9803_ONE_SHOT_DISABLED);
mcp9803_LoadConfig(&mcp9803);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1) {
  printf("Temperature: %d \r\n", (int)mcp9803_GetTemperature(&mcp9803));
  HAL_Delay(2000);
  /* USER CODE END WHILE */
  /* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */

Successfully tested on:

• H723ZG
• H743ZI
• F767ZI
• F411RE
• G431KB

Address register:

MCP9803_DEFAULT_ADDRESS 0x48<<1
MCP9803_CONFIG_REGISTER 0x01 //00000001U
MCP9803_AMBIENT_TEMPERATURE_REGISTER 0x00 //00000000U
MCP9803_HYSTERESIS_REGISTER 0x02 //00000010U
MCP9803_LIMIT_SET_REGISTER 0x03 //00000010U

Config register:

MCP9803_ONE_SHOT_ENABLED 0x80
MCP9803_ONE_SHOT_DISABLED 0x00

MCP9803_FAULT_QUEUE_1 0x00
MCP9803_FAULT_QUEUE_2 0x08
MCP9803_FAULT_QUEUE_4 0x10
MCP9803_FAULT_QUEUE_6 0x18

MCP9803_ADC_RESOLUTION_9_BIT 0x00
MCP9803_ADC_RESOLUTION_10_BIT 0x20
MCP9803_ADC_RESOLUTION_11_BIT 0x40
MCP9803_ADC_RESOLUTION_12_BIT 0x60

MCP9803_ALERT_POLARITY_ENABLED 0x04
MCP9803_ALERT_POLARITY_DISABLED 0x00

MCP9803_COMPARATOR_MODE 0x00
MCP9803_INTERPUT_MODE 0x02

MCP9803_SHUTDOWN_ENABLE 0x01
MCP9803_SHUTDOWN_DISABLE 0x00

typedef enum
{
	ADC_RESOLUTION_9_BIT    = 0x00,//!< ADC_RESOLUTION_9_BIT
	ADC_RESOLUTION_10_BIT   = 0x20,//!< ADC_RESOLUTION_10_BIT
	ADC_RESOLUTION_11_BIT   = 0x40,//!< ADC_RESOLUTION_11_BIT
	ADC_RESOLUTION_12_BIT  	 = 0x60//!< ADC_RESOLUTION_12_BIT
} ADCResolution_t;

Pins configuration:

PERIPHERALS	MODES	FUNCTIONS	PINS
I2C1	I2C	I2C1_SCL	PB8
I2C1	I2C	I2C1_SDA	PB9
SYS	Trace Asynchronous Sw	SYS_JTMS-SWDIO	PA13
SYS	Trace Asynchronous Sw	SYS_JTCK-SWCLK	PA14
SYS	Trace Asynchronous Sw	SYS_JTDO-SWO	PB3
SYS	SysTick	SYS_VS_Systick	VP_SYS_VS_Systick

For using printf with float should be add flag -u _printf_float in C compiler