murata_ncu15xh103f6sxx.c

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 *
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/**
 * @file    murata_ncu15xh103f6sxx.c
 * @author  foxBMS Team
 * @date    2022-10-12 (date of creation)
 * @updated 2022-10-27 (date of last update)
 * @version v1.4.1
 * @ingroup TEMPERATURE_SENSORS
 * @prefix  TS
 *
 * @brief   Resistive divider used for measuring temperature
 *
 */
 
/*========== Includes =======================================================*/
#include "murata_ncu15xh103f6sxx.h"
 
#include "foxmath.h"
#include "temperature_sensor_defs.h"
 
/*========== Macros and Definitions =========================================*/
 
/*========== Static Constant and Variable Definitions =======================*/
 
/** LUT filled from higher resistance to lower resistance - datasheet: RO3E - Aug. 3, 2018 */
static const TS_TEMPERATURE_SENSOR_LUT_s ts_ncu15xh103f6sxxLut[] = {
    {-400, 195652.0f}, {-350, 148171.0f}, {-300, 113347.0f}, {-250, 87559.0f}, {-200, 68237.0f}, {-150, 53650.0f},
    {-100, 42506.0f},  {-50, 33892.0f},   {0, 27219.0f},     {50, 22021.0f},   {100, 17926.0f},  {150, 14674.0f},
    {200, 12081.0f},   {250, 10000.0f},   {300, 8315.0f},    {350, 6948.0f},   {400, 5834.0f},   {450, 4917.0f},
    {500, 4161.0f},    {550, 3535.0f},    {600, 3014.0f},    {650, 2586.0f},   {700, 2228.0f},   {750, 1925.0f},
    {800, 1669.0f},    {850, 1452.0f},    {900, 1268.0f},    {950, 1110.0f},   {1000, 974.0f},   {1050, 858.0f},
    {1100, 758.0f},    {1150, 672.0f},    {1200, 596.0f},    {1250, 531.0f},   {1300, 474.0f},   {1350, 424.0f},
    {1400, 381.0f},    {1450, 342.0f},    {1500, 309.0f},
};
 
/** size of the #ts_ntcle317e4103sbaLut LUT */
static const uint16_t ts_ncu15xh103f6sxxLutSize = sizeof(ts_ncu15xh103f6sxxLut) / sizeof(TS_TEMPERATURE_SENSOR_LUT_s);
 
/*========== Extern Constant and Variable Definitions =======================*/
/**
 * Defines for calculating the ADC voltage on the ends of the operating range.
 * The ADC voltage is calculated with the following formula:
 *
 * V_adc = ( ( V_supply * R_ntc ) / ( R + R_ntc ) )
 *
 * Depending on the position of the NTC in the voltage resistor (R_1/R_2),
 * different R_ntc values are used for the calculation.
 * @{
 */
#if TS_MURATA_NCU15XH103F6SXX_POSITION_IN_RESISTOR_DIVIDER_IS_R_1 == true
#define TS_MURATA_NCU15XH103F6SXX_ADC_VOLTAGE_V_MAX_V \
    ((float)((TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_SUPPLY_VOLTAGE_V * ts_ncu15xh103f6sxxLut[ts_ncu15xh103f6sxxLutSize-1u].resistance_Ohm) / (ts_ncu15xh103f6sxxLut[ts_ncu15xh103f6sxxLutSize-1u].resistance_Ohm+TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_RESISTANCE_R_1_R_2_Ohm)))
#define TS_MURATA_NCU15XH103F6SXX_ADC_VOLTAGE_V_MIN_V \
    ((float)((TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_SUPPLY_VOLTAGE_V * ts_ncu15xh103f6sxxLut[0u].resistance_Ohm) / (ts_ncu15xh103f6sxxLut[0u].resistance_Ohm+TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_RESISTANCE_R_1_R_2_Ohm)))
#else /* TS_MURATA_NCU15XH103F6SXX_POSITION_IN_RESISTOR_DIVIDER_IS_R_1 is false */
#define TS_MURATA_NCU15XH103F6SXX_ADC_VOLTAGE_V_MIN_V \
    ((float)((TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_SUPPLY_VOLTAGE_V * ts_ncu15xh103f6sxxLut[ts_ncu15xh103f6sxxLutSize-1u].resistance_Ohm) / (ts_ncu15xh103f6sxxLut[ts_ncu15xh103f6sxxLutSize-1u].resistance_Ohm+TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_RESISTANCE_R_1_R_2_Ohm)))
#define TS_MURATA_NCU15XH103F6SXX_ADC_VOLTAGE_V_MAX_V \
    ((float)((TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_SUPPLY_VOLTAGE_V * ts_ncu15xh103f6sxxLut[0u].resistance_Ohm) / (ts_ncu15xh103f6sxxLut[0u].resistance_Ohm+TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_RESISTANCE_R_1_R_2_Ohm)))
#endif
/**@}*/
 
/*========== Static Function Prototypes =====================================*/
 
/*========== Static Function Implementations ================================*/
 
/*========== Extern Function Implementations ================================*/
 
extern int16_t TS_Mur00GetTemperatureFromLut(uint16_t adcVoltage_mV) {
    int16_t temperature_ddegC = INT16_MIN;
    float adcVoltage_V        = (float)adcVoltage_mV / TS_SCALING_FACTOR_1V_IN_MV_FLOAT; /* Convert mV to V */
 
    /* Check for valid ADC measurements to prevent undefined behavior */
    if (adcVoltage_V > TS_MURATA_NCU15XH103F6SXX_ADC_VOLTAGE_V_MAX_V) {
        /* Invalid measured ADC voltage -> sensor out of operating range or disconnected/shorted */
        temperature_ddegC = INT16_MIN;
    } else if (adcVoltage_V < TS_MURATA_NCU15XH103F6SXX_ADC_VOLTAGE_V_MIN_V) {
        /* Invalid measured ADC voltage -> sensor out of operating range or shorted/disconnected */
        temperature_ddegC = INT16_MAX;
    } else {
        /* Calculate NTC resistance based on measured ADC voltage */
#if TS_MURATA_NCU15XH103F6SXX_POSITION_IN_RESISTOR_DIVIDER_IS_R_1 == true
        /* R_1 = R_2 * ( ( V_supply / V_adc ) - 1 ) */
        const float resistance_Ohm = TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_RESISTANCE_R_1_R_2_Ohm *
                                     ((TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_SUPPLY_VOLTAGE_V / adcVoltage_V) - 1);
#else  /* TS_MURATA_NCU15XH103F6SXX_POSITION_IN_RESISTOR_DIVIDER_IS_R_1 is false */
        /* formula: R_2 = R_1 * ( V_2 / ( V_supply - V_adc ) ) */
        const float resistance_Ohm =
            TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_RESISTANCE_R_1_R_2_Ohm *
            (adcVoltage_V / (TS_MURATA_NCU15XH103F6SXX_RESISTOR_DIVIDER_SUPPLY_VOLTAGE_V - adcVoltage_V));
#endif /* TS_MURATA_NCU15XH103F6SXX_POSITION_IN_RESISTOR_DIVIDER_IS_R_1 */
 
        /* Variables for interpolating LUT value */
        uint16_t between_high = 0;
        uint16_t between_low  = 0;
        for (uint16_t i = 0u; i < ts_ncu15xh103f6sxxLutSize; i++) {
            if (resistance_Ohm < ts_ncu15xh103f6sxxLut[i].resistance_Ohm) {
                between_low  = i + 1u;
                between_high = i;
            }
        }
 
        /* Interpolate between LUT values, but do not extrapolate LUT! */
        if (!(((between_high == 0u) && (between_low == 0u)) || /* measured resistance > maximum LUT resistance */
              (between_low >= ts_ncu15xh103f6sxxLutSize))) {   /* measured resistance < minimum LUT resistance */
            temperature_ddegC = (int16_t)MATH_LinearInterpolation(
                ts_ncu15xh103f6sxxLut[between_low].resistance_Ohm,
                (float)ts_ncu15xh103f6sxxLut[between_low].temperature_ddegC,
                ts_ncu15xh103f6sxxLut[between_high].resistance_Ohm,
                (float)ts_ncu15xh103f6sxxLut[between_high].temperature_ddegC,
                resistance_Ohm);
        }
    }
 
    /* Return temperature based on measured NTC resistance */
    return temperature_ddegC;
}
 
extern int16_t TS_Mur00GetTemperatureFromPolynomial(uint16_t adcVoltage_mV) {
    (void)adcVoltage_mV;
    FAS_ASSERT(FAS_TRAP);
    int16_t temperature_ddegC = 0;
    /* TODO this is not implemented */
    return temperature_ddegC;
}
 
/*========== Externalized Static Function Implementations (Unit Test) =======*/