Library to support temperature sensor conversions and lookups
ntc_10k_44031.cpp
- Committer:
- mahphalke
- Date:
- 2021-03-19
- Revision:
- 2:bcfa5a2f21c9
- Parent:
- 1:f65f6fadda5d
- Child:
- 4:d8246c20aed2
File content as of revision 2:bcfa5a2f21c9:
/*! ***************************************************************************** @file: ntc_10k_44031.cpp @brief: This file contains functionality for 10K NTC 44021 model @details: ----------------------------------------------------------------------------- Copyright (c) 2021 Analog Devices, Inc. All rights reserved. This software is proprietary to Analog Devices, Inc. and its licensors. By using this software you agree to the terms of the associated Analog Devices Software License Agreement. *****************************************************************************/ #include <math.h> #include "thermistor.h" #include "ntc_10k_44031.h" #ifdef DEFINE_LOOKUP_TABLES /* 10K NTC look-up table. Values are resistance in ohm for temperature * range from -10 to 80C with +/-1C tolerance. * @note This function uses Steinhart-Hart equation for deriving look-up table. **/ const uint32_t ntc_10k_44031rc::lut[] = { 47561, 45285, 43131, 41091, 39158, 37327, 35591, 33946, 32385, 30905, 29500, 28166, 26900, 25697, 24555, 23470, 22438, 21457, 20524, 19637, 18792, 17989, 17224, 16495, 15801, 15140, 14510, 13910, 13337, 12791, 12271, 11774, 11299, 10847, 10414, 10002, 9607, 9231, 8870, 8526, 8197, 7882, 7581, 7293, 7018, 6754, 6501, 6259, 6028, 5806, 5593, 5389, 5194, 5006, 4827, 4654, 4489, 4331, 4178, 4032, 3892, 3757, 3628, 3503, 3384, 3269, 3159, 3053, 2951, 2852, 2758, 2667, 2580, 2496, 2415, 2337, 2262, 2189, 2120, 2053, 1988, 1926, 1866, 1808, 1752, 1698, 1646, 1596, 1548, 1501, 1456 }; #endif /*! * @brief This is a constructor for ntc_10k_44031rc class * @return none */ ntc_10k_44031rc::ntc_10k_44031rc() { /* Coefficients of Steinhart-Hart equation for 10K NTC to convert * NTC resistance into equivalent temperature */ ntc_10k_44031rc::coeff_A = 1.032*pow(10, -3); ntc_10k_44031rc::coeff_B = 2.387*pow(10, -4); ntc_10k_44031rc::coeff_C = 1.580*pow(10, -7); #ifdef DEFINE_LOOKUP_TABLES ntc_10k_44031rc::lut_offset = -10; /* Min temperature obtained through LUT */ ntc_10k_44031rc::lut_size = 90; /* Temperature range defined in LUT [lut_offset : lut_size - lut_offset] */ #endif } /*! * @brief Convert the thermistor resistance into equivalent temperature using * Steinhart-Hart equation for 10K 44031 NTC * @param resistance[in] - thermistor resistance * @return Thermistor temperature value */ float ntc_10k_44031rc::convert(const float resistance) { return thermistor::convert(resistance, coeff_A, coeff_B, coeff_C); } #ifdef DEFINE_LOOKUP_TABLES /*! * @brief Convert the thermistor resistance into equivalent temperature using * lookup table for 10K 44031 NTC * @param resistance[in] - thermistor resistance * @return Thermistor temperature value */ float ntc_10k_44031rc::lookup(const float resistance) { return thermistor::lookup(lut, resistance, lut_size, lut_offset); } #endif