The MAX31725, MAX31726 temperature sensors provides temperature measurements with an accuracy of up to +-0.5°C. Extended format allows for high temperature readings up to 150°C. The MAX31725 can operate in a low powered mode by utilizing the shutdown and one-shot mode. Supports two-wire serial, I2C bus communications. 8-pin TQDFN 3x3 mm package. Accuracy is +-0.5°C from -40°C to +105°C (-40°F to +221°). The operating temperature range is -55°C to +150°C (-67°F to +302°). VDD is 2.5V to 3.7V.
Dependents: MAX31725_High_Temperature_Accurate_IC
Diff: max31725_cpp.h
- Revision:
- 20:c9805b01e814
- Child:
- 21:bb7ba5566a62
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/max31725_cpp.h Tue Apr 09 07:00:32 2019 +0000 @@ -0,0 +1,183 @@ +/******************************************************************************* +* Copyright (C) 2019 Maxim Integrated Products, Inc., All Rights Reserved. +* +* Permission is hereby granted, free of charge, to any person obtaining a +* copy of this software and associated documentation files (the "Software"), +* to deal in the Software without restriction, including without limitation +* the rights to use, copy, modify, merge, publish, distribute, sublicense, +* and/or sell copies of the Software, and to permit persons to whom the +* Software is furnished to do so, subject to the following conditions: +* +* The above copyright notice and this permission notice shall be included +* in all copies or substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES +* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, +* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +* OTHER DEALINGS IN THE SOFTWARE. +* +* Except as contained in this notice, the name of Maxim Integrated +* Products, Inc. shall not be used except as stated in the Maxim Integrated +* Products, Inc. Branding Policy. +* +* The mere transfer of this software does not imply any licenses +* of trade secrets, proprietary technology, copyrights, patents, +* trademarks, maskwork rights, or any other form of intellectual +* property whatsoever. Maxim Integrated Products, Inc. retains all +* ownership rights. +******************************************************************************* +* @file max31725_cpp.h +******************************************************************************* +*/ +#ifndef MAX31725_CPP_H +#define MAX31725_CPP_H +#include "mbed.h" + + +/** + * @brief Digital thermometer, thermostat, temperature sensor. + * @version 1.0000.0002 + * + * @details The MAX31725, MAX31726 temperature sensors + * provides accurate temperature measurements. + * Extended format allows for high temperature readings up to 150 °C. + * The MAX31725 can operate in a low powered mode by utilizing + * the shutdown and one-shot mode. + * 8-pin TQDFN 3x3 mm package + * Accuracy is +-0.5°C from -40°C to +105°C (-40°F to +221°), + * + * @code + * #include "mbed.h" + * #include "max32630fthr.h" + * #include "max31725.h" + * #include "USBSerial.h" + * MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); + * I2C i2cBus(P3_4, P3_5); + * int main() + * { + * float temperature; + * DigitalOut rLED(LED1, LED_OFF); + * DigitalOut gLED(LED2, LED_OFF); + * DigitalOut bLED(LED3, LED_OFF); + * gLED = LED_ON; + * MAX31725 temp_sensor(i2cBus, MAX31725_I2C_SLAVE_ADR_R0); + * i2cBus.frequency(400000); + * temperature = + * temp_sensor.read_reg_as_temperature(MAX31725_REG_TEMPERATURE); + * printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", + * temperature, temp_sensor.celsius_to_fahrenheit(temperature)); + * } + * @endcode + */ + +class MAX31725 +{ + public: + + /**********************************************************//** + * @brief Constructor for MAX31725 Class. + * + * @details Allows user to use existing I2C object + * + * On Entry: + * @param[in] i2c_bus - pointer to existing I2C object + * @param[in] i2c_adrs - 7-bit slave address of MAX31725 + * + * On Exit: + * + * @return None + **************************************************************/ + MAX31725(I2C &i2c_bus, uint8_t slave_address); + + /**********************************************************//** + * @brief Default destructor for MAX31725 Class. + * + * @details Destroys I2C object if owner + * + * On Entry: + * + * On Exit: + * + * @return None + **************************************************************/ + ~MAX31725(); + + /** + * @brief Read register of device at slave address + * @param[out] value - Read data on success + * @return 0 on success, negative number on failure + */ + int read_cfg_reg(uint8_t *value); + + /** + * @brief Read register of device at slave address + * @param[out] value - Read data on success + * @param reg - Register address + * @return 0 on success, negative number on failure + */ + int read_reg16(int16_t *value, char reg); + + /** + * @brief Reads the temperature registers + * @param reg - the address of the temperature register + * @return temperature in degrees Celsius + */ + float read_reg_as_temperature(uint8_t reg); + + /** + * @brief Writes to the configuration register + * @param cfg - configurate word + * @return 0 on success, negative number on failure + */ + int write_cfg_reg(uint8_t cfg); + + /** + * @brief Writes to the THYST register + * @param temperature - the temperature in Celsius degrees + * @return 0 on success, negative number on failure + */ + int write_trip_low_thyst(float temperature); + + /** + * @brief Writes to the TOS register + * @param temperature - the temperature in Celsius degrees + * @return 0 on success, negative number on failure + */ + int write_trip_high_tos(float temperature); + + /** + * @brief Converts Celsius degrees to Fahrenheit + * @param temp_c - the temperature in Celsius degrees + * @return temperature in Celsius degrees + */ + float celsius_to_fahrenheit(float temp_c); + +protected: + /** + * @brief Write a value to a register + * @param value - value to write to the register + * @param reg - register address + * @return 0 on success, negative number on failure + */ + int write_reg16(int16_t value, char reg); + +private: + /** @var m_i2c + * @brief I2C object + */ + I2C &m_i2c; + /** @var m_write_address, m_read_address + * @brief I2C address + */ + uint8_t m_write_address, m_read_address; + /** @var m_extended_format + * @brief Extended format, add 64°C to the temperature reading + */ + uint32_t max31725_extended_format; + +}; + +#endif/* DS1775_CPP_H */ \ No newline at end of file