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ltc2991_lib
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LTC2991.h
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00001 /*! 00002 LTC2991: 14-bit ADC octal I2C voltage, current, and temperature monitor. 00003 00004 @verbatim 00005 00006 The LTC2991 is used to monitor system temperatures, voltages and currents. 00007 Through the I2C serial interface, the eight monitors can individually measure 00008 supply voltages and can be paired for differential measurements of current sense 00009 resistors or temperature sensing transistors. Additional measurements include 00010 internal temperature and internal VCC. The internal 10ppm reference minimizes 00011 the number of supporting components and area required. Selectable address and 00012 configurable functionality give the LTC2991 flexibility to be incorporated in 00013 various systems needing temperature, voltage or current data. The LTC2991 fits 00014 well in systems needing submillivolt voltage resolution, 1% current measurement 00015 and 1 degree Celsius temperature accuracy or any combination of the three. 00016 00017 I2C DATA FORMAT (MSB FIRST); 00018 00019 Data Out: 00020 Byte #1 Byte #2 Byte #3 00021 00022 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK X X X X C3 C2 C1 C0 SACK D7 D6 D5 D4 D3 D2 D1 D0 SACK STOP 00023 00024 Data In: 00025 Byte #1 Byte #2 Byte #3 00026 00027 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK X X X X C3 C2 C1 C0 SACK REPEAT START SA6 SA5 SA4 SA3 SA2 SA1 SA0 R SACK 00028 00029 Byte #4 Byte #5 00030 MSB LSB 00031 D15 D14 D13 D12 D11 D10 D9 D8 MACK D7 D6 D5 D4 D3 D2 D1 D0 MNACK STOP 00032 00033 START : I2C Start 00034 REPEAT Start : I2C Repeat Start 00035 STOP : I2C Stop 00036 SACK : I2C Slave Generated Acknowledge (Active Low) 00037 MACK : I2C Master Generated Acknowledge (Active Low) 00038 MNACK : I2C Master Generated Not Acknowledge 00039 SAx : I2C Address 00040 W : I2C Write (0) 00041 R : I2C Read (1) 00042 Cx : Command Code 00043 Dx : Data Bits 00044 X : Don't care 00045 00046 00047 Example Code: 00048 00049 Read single-ended voltage from V1. 00050 00051 // Enable Single-Ended Mode 00052 ack |= LTC2991_register_set_clear_bits(LTC2991_I2C_ADDRESS, LTC2991_CONTROL_V1234_REG, 0x00, LTC2991_V1_V2_DIFFERENTIAL_ENABLE | LTC2991_V1_V2_TEMP_ENABLE); 00053 00054 // Flush one ADC reading in case it is stale. Then, take a new fresh reading. 00055 ack |= LTC2991_adc_read_new_data(LTC2991_I2C_ADDRESS, LTC2991_V1_MSB_REG, &code, &data_valid, LTC2991_TIMEOUT); 00056 00057 voltage = LTC2991_code_to_single_ended_voltage(code, LTC2991_SINGLE_ENDED_lsb); // Converts code to voltage from single-ended lsb 00058 00059 Read current from V3-V4. 00060 00061 resistor = 1; // R_sense across V3-V4 in ohms 00062 00063 // Enable Differential Mode 00064 ack |= LTC2991_register_set_clear_bits(LTC2991_I2C_ADDRESS, LTC2991_CONTROL_V1234_REG, LTC2991_V3_V4_DIFFERENTIAL_ENABLE, LTC2991_V3_V4_TEMP_ENABLE); 00065 00066 // Flush one ADC reading in case it is stale. Then, take a new fresh reading. 00067 ack |= LTC2991_adc_read_new_data(LTC2991_I2C_ADDRESS, LTC2991_V4_MSB_REG, &code, &data_valid, LTC2991_TIMEOUT); 00068 00069 voltage = LTC2991_code_to_differential_voltage(code, LTC2991_DIFFERENTIAL_lsb); // Converts code to voltage from differential lsb 00070 current = voltage / resistor; // Calculates current 00071 00072 Read temperature from diode connected to V7-V8. 00073 00074 // Enable temperature mode. 00075 ack |= LTC2991_register_set_clear_bits(LTC2991_I2C_ADDRESS, LTC2991_CONTROL_V5678_REG, LTC2991_V7_V8_TEMP_ENABLE, 0x00); 00076 00077 // Flush one ADC reading in case it is stale. Then, take a new fresh reading. 00078 ack |= LTC2991_adc_read_new_data(LTC2991_I2C_ADDRESS, LTC2991_V7_MSB_REG, &adc_code, &data_valid, LTC2991_TIMEOUT); 00079 00080 // Converts code to temperature from adc code and temperature lsb 00081 temperature = LTC2991_temperature(adc_code, LTC2991_TEMPERATURE_lsb); 00082 00083 @endverbatim 00084 00085 http://www.linear.com/product/LTC2991 00086 00087 http://www.linear.com/product/LTC2991#demoboards 00088 00089 REVISION HISTORY 00090 $Revision: 3659 $ 00091 $Date: 2015-07-01 10:19:20 -0700 (Wed, 01 Jul 2015) $ 00092 00093 Copyright (c) 2013, Linear Technology Corp.(LTC) 00094 All rights reserved. 00095 00096 Redistribution and use in source and binary forms, with or without 00097 modification, are permitted provided that the following conditions are met: 00098 00099 1. Redistributions of source code must retain the above copyright notice, this 00100 list of conditions and the following disclaimer. 00101 2. Redistributions in binary form must reproduce the above copyright notice, 00102 this list of conditions and the following disclaimer in the documentation 00103 and/or other materials provided with the distribution. 00104 00105 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 00106 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00107 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00108 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 00109 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00110 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00111 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00112 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00113 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00114 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00115 00116 The views and conclusions contained in the software and documentation are those 00117 of the authors and should not be interpreted as representing official policies, 00118 either expressed or implied, of Linear Technology Corp. 00119 00120 The Linear Technology Linduino is not affiliated with the official Arduino team. 00121 However, the Linduino is only possible because of the Arduino team's commitment 00122 to the open-source community. Please, visit http://www.arduino.cc and 00123 http://store.arduino.cc , and consider a purchase that will help fund their 00124 ongoing work. 00125 00126 */ 00127 /*! @file 00128 @ingroup LTC2991 00129 Library Header File for LTC2991: 14-bit Octal I2C Voltage, Current, and Temperature Monitor 00130 */ 00131 00132 #ifndef LTC2991_H 00133 #define LTC2991_H 00134 00135 typedef bool boolean; 00136 //#include <Wire.h> 00137 00138 // Calibration Variables 00139 //! Typical single-ended LSB weight in volts 00140 const float LTC2991_SINGLE_ENDED_lsb = 3.05176E-04; 00141 //! Typical differential LSB weight in volts 00142 const float LTC2991_DIFFERENTIAL_lsb = 1.90735E-05; 00143 //! Typical VCC LSB weight in volts 00144 const float LTC2991_VCC_lsb = 3.05176E-04; 00145 //! Typical temperature LSB weight in degrees Celsius (and Kelvin). 00146 //! Used for internal temperature as well as remote diode temperature measurements. 00147 const float LTC2991_TEMPERATURE_lsb = 0.0625; 00148 //! Typical remote diode LSB weight in volts. 00149 //! Used to readback diode voltage when in temperature measurement mode. 00150 const float LTC2991_DIODE_VOLTAGE_lsb = 3.815E-05; 00151 00152 /*! @name I2C_Addresses 00153 @{ */ 00154 00155 //! I2C address of the LTC2991. 00156 //! Configured by tying the ADR0, ADR1, and ADR2 pins high or low. See Table 1 of datasheet. 00157 //! Uncomment LTC2991_I2C_ADDRESS to match demo board configuration. 00158 // Address assignment 00159 // LTC2991 I2C Address // AD2 AD1 AD0 00160 #define LTC2991_I2C_ADDRESS 0x48 // Low Low Low 00161 // #define LTC2991_I2C_ADDRESS 0x49 // Low Low High 00162 // #define LTC2991_I2C_ADDRESS 0x4A // Low High Low 00163 // #define LTC2991_I2C_ADDRESS 0x4B // Low High High 00164 // #define LTC2991_I2C_ADDRESS 0x4C // High Low Low 00165 // #define LTC2991_I2C_ADDRESS 0x4D // High Low High 00166 // #define LTC2991_I2C_ADDRESS 0x4E // High High Low 00167 //#define LTC2991_I2C_ADDRESS 0x4F // High High High 00168 00169 //! LTC2991 Global I2C Address. 00170 #define LTC2991_I2C_GLOBAL_ADDRESS 0x77 // Global Address 00171 00172 /*! @} */ 00173 /*! @name REGISTERS 00174 @{ */ 00175 00176 #define LTC2991_STATUS_LOW_REG 0x00 //!< Data_Valid Bits(V1 Through V8) 00177 #define LTC2991_STATUS_HIGH_REG 0x01 //!< Data_valid bits 00178 #define LTC2991_CHANNEL_ENABLE_REG 0x01 //!< Channel Enable, Vcc, T_internal Conversion Status, Trigger 00179 #define LTC2991_CONTROL_V1234_REG 0x06 //!< V1, V2, V3, and V4 Control Register 00180 #define LTC2991_CONTROL_V5678_REG 0x07 //!< V5, V6, V7, AND V8 Control Register 00181 #define LTC2991_CONTROL_PWM_Tinternal_REG 0x08 //!< PWM Threshold and T_internal Control Register 00182 #define LTC2991_PWM_THRESHOLD_MSB_REG 0x09 //!< PWM Threshold 00183 #define LTC2991_V1_MSB_REG 0x0A //!< V1, or T_R1 T MSB 00184 #define LTC2991_V1_LSB_REG 0x0B //!< V1, or T_R1 T LSB 00185 #define LTC2991_V2_MSB_REG 0x0C //!< V2, V1-V2, or T_R2 Voltage MSB 00186 #define LTC2991_V2_LSB_REG 0x0D //!< V2, V1-V2, or T_R2 Voltage LSB 00187 #define LTC2991_V3_MSB_REG 0x0E //!< V3, or T_R2 T MSB 00188 #define LTC2991_V3_LSB_REG 0x0F //!< V3, or T_R2 T LSB 00189 #define LTC2991_V4_MSB_REG 0x10 //!< V4, V3-V4, or T_R2 Voltage MSB 00190 #define LTC2991_V4_LSB_REG 0x11 //!< V4, V3-V4, or T_R2 Voltage LSB 00191 #define LTC2991_V5_MSB_REG 0x12 //!< V5, or T_R3 T MSB 00192 #define LTC2991_V5_LSB_REG 0x13 //!< V5, or T_R3 T LSB 00193 #define LTC2991_V6_MSB_REG 0x14 //!< V6, V5-V6, or T_R3 Voltage MSB 00194 #define LTC2991_V6_LSB_REG 0x15 //!< V6, V5-V6, or T_R3 Voltage LSB 00195 #define LTC2991_V7_MSB_REG 0x16 //!< V7, or T_R4 T MSB 00196 #define LTC2991_V7_LSB_REG 0x17 //!< V7, or T_R4 T LSB 00197 #define LTC2991_V8_MSB_REG 0x18 //!< V8, V7-V8, or T_R4 Voltage MSB 00198 #define LTC2991_V8_LSB_REG 0x19 //!< V8, V7-V8, or T_R4 Voltage LSB 00199 #define LTC2991_T_Internal_MSB_REG 0x1A //!< T_Internal MSB 00200 #define LTC2991_T_Internal_LSB_REG 0x1B //!< T_Internal LSB 00201 #define LTC2991_Vcc_MSB_REG 0x1C //!< Vcc MSB 00202 #define LTC2991_Vcc_LSB_REG 0x1D //!< Vcc LSB 00203 00204 /*! @} */ 00205 /*! @name LTC2991_CHANNEL_ENABLE_REG SETTINGS 00206 Bitwise OR settings, and write to LTC2991_CHANNEL_ENABLE_REG to configure settings. 00207 Bitwise AND with value read from LTC2991_CHANNEL_ENABLE_REG to determine present setting. 00208 @{ */ 00209 00210 #define LTC2991_V7_V8_TR4_ENABLE 0x80 //!< Enable V7-V8 measurements, including TR4 temperature 00211 #define LTC2991_V5_V6_TR3_ENABLE 0x40 //!< Enable V5-V6 measurements, including TR3 temperature 00212 #define LTC2991_V3_V4_TR2_ENABLE 0x20 //!< Enable V3-V4 measurements, including TR2 temperature 00213 #define LTC2991_V1_V2_TR1_ENABLE 0x10 //!< Enable V1-V2 measurements, including TR1 temperature 00214 #define LTC2991_VCC_TINTERNAL_ENABLE 0x08 //!< Enable Vcc internal voltage measurement 00215 #define LTC2991_ENABLE_ALL_CHANNELS 0xF8 //!< Use to enable all LTC2991 channels. Equivalent to bitwise OR'ing all channel enables. 00216 #define LTC2991_BUSY 0x04 //!< LTC2991 Busy Bit 00217 00218 /*! @} */ 00219 /*! @name LTC2991_CONTROL_V1234_REG SETTINGS 00220 Bitwise OR settings, and write to LTC2991_CONTROL_V1234_REG to configure settings. 00221 Bitwise AND with value read from LTC2991_CONTROL_V1234_REG to determine present setting. 00222 @{ */ 00223 00224 #define LTC2991_V3_V4_FILTER_ENABLE 0x80 //!< Enable filters on V3-V4 00225 #define LTC2991_V3_V4_KELVIN_ENABLE 0x40 //!< Enable V3-V4 for Kelvin. Otherwise, Celsius. 00226 #define LTC2991_V3_V4_TEMP_ENABLE 0x20 //!< Enable V3-V4 temperature mode. 00227 #define LTC2991_V3_V4_DIFFERENTIAL_ENABLE 0x10 //!< Enable V3-V4 differential mode. Otherwise, single-ended. 00228 #define LTC2991_V1_V2_FILTER_ENABLE 0x08 //!< Enable filters on V1-V2 00229 #define LTC2991_V1_V2_KELVIN_ENABLE 0x04 //!< Enable V1-V2 for Kelvin. Otherwise, Celsius. 00230 #define LTC2991_V1_V2_TEMP_ENABLE 0x02 //!< Enable V1-V2 temperature mode. 00231 #define LTC2991_V1_V2_DIFFERENTIAL_ENABLE 0x01 //!< Enable V1-V2 differential mode. Otherwise, single-ended. 00232 00233 /*! @} */ 00234 /*! @name LTC2991_CONTROL_V5678_REG SETTINGS 00235 Bitwise OR settings, and write to LTC2991_CONTROL_V5678_REG to configure settings. 00236 Bitwise AND with value read from LTC2991_CONTROL_V5678_REG to determine present setting. 00237 @{ */ 00238 00239 #define LTC2991_V7_V8_FILTER_ENABLE 0x80 //!< Enable filters on V7-V8 00240 #define LTC2991_V7_V8_KELVIN_ENABLE 0x40 //!< Enable V7-V8 for Kelvin. Otherwise, Celsius. 00241 #define LTC2991_V7_V8_TEMP_ENABLE 0x20 //!< Enable V7-V8 temperature mode. 00242 #define LTC2991_V7_V8_DIFFERENTIAL_ENABLE 0x10 //!< Enable V7-V8 differential mode. Otherwise, single-ended. 00243 #define LTC2991_V5_V6_FILTER_ENABLE 0x08 //!< Enable filters on V5-V6 00244 #define LTC2991_V5_V6_KELVIN_ENABLE 0x04 //!< Enable V5-V6 for Kelvin. Otherwise, Celsius. 00245 #define LTC2991_V5_V6_TEMP_ENABLE 0x02 //!< Enable V5-V6 temperature mode. 00246 #define LTC2991_V5_V6_DIFFERENTIAL_ENABLE 0x01 //!< Enable V5-V6 differential mode. Otherwise, single-ended. 00247 00248 /*! @} */ 00249 /*! @name LTC2991_CONTROL_PWM_Tinternal_REG SETTINGS 00250 Bitwise OR settings, and write to LTC2991_CONTROL_PWM_Tinternal_REG to configure settings. 00251 Bitwise AND with value read from LTC2991_CONTROL_PWM_Tinternal_REG to determine present setting. 00252 @{ */ 00253 00254 #define LTC2991_PWM_0 0x80 //!< PWM threshold Least Significant Bit 00255 #define LTC2991_PWM_INVERT 0x40 //!< Invert PWM 00256 #define LTC2991_PWM_ENABLE 0x20 //!< Enable PWM 00257 #define LTC2991_REPEAT_MODE 0x10 //!< Enable Repeated Aquisition Mode 00258 #define LTC2991_INT_FILTER_ENABLE 0x08 //!< Enable Internal Temperature Filter 00259 #define LTC2991_INT_KELVIN_ENABLE 0x04 //!< Enable internal temperature for Kelvin. Otherwise, Celsius. 00260 /*!@} */ 00261 00262 #include "LT_I2C.h " 00263 00264 00265 class LTC2991 { 00266 00267 private: 00268 LT_I2C *lti2c; 00269 00270 00271 public: 00272 LTC2991(); 00273 LTC2991(PinName i2c_scl_, PinName i2c_sda_); 00274 00275 //! Reads a 14-bit adc_code from LTC2991. 00276 //! @return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge. 00277 int8_t LTC2991_adc_read(uint8_t i2c_address, //!< I2C address of the LTC2991. Configured by tying the ADR0, ADR1, and ADR2 pins high or low. See Table 1 of datasheet. 00278 uint8_t msb_register_address, /*!< Address of the LTC2991 MSB register to be read. This is also known as the "command byte". 00279 Two sequential 8-bit registers are read, starting with the msb_register_address.*/ 00280 int16_t *adc_code, //!< returns 14-bit value read from the adc 00281 int8_t *data_valid //!< returns the status of the DATA_VALID bit. *data_valid=0 indicates stale data 00282 ); 00283 00284 //! Reads a 14-bit adc_code from the LTC2991 but enforces a maximum timeout. 00285 //! Similar to LTC2991_adc_read except it repeats until the data_valid bit is set, it fails to receive an I2C acknowledge, or the timeout (in milliseconds) 00286 //! expires. It keeps trying to read from the LTC2991 every millisecond until the data_valid bit is set (indicating new data since the previous 00287 //! time this register was read) or until it fails to receive an I2C acknowledge (indicating an error on the I2C bus). 00288 //! @return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge. 00289 int8_t LTC2991_adc_read_timeout(uint8_t i2c_address, //!< I2C address of the LTC2991. Configured by tying the ADR0, ADR1, and ADR2 pins high or low. See Table 1 of datasheet. 00290 uint8_t msb_register_address, /*!< Address of the LTC2991 MSB register to be read. This is also known as the "command byte". 00291 Two sequential 8-bit registers will be read, starting with the msb_register_address.*/ 00292 int16_t *adc_code, //!< returns 14-bit value read from the adc 00293 int8_t *data_valid, //!< returns the status of the DATA_VALID bit. *data_valid=0 indicates stale data 00294 uint16_t timeout, //!< maximum timeout in millisceonds. If at any time a NACK is received the function aborts. 00295 uint8_t status_bit //!< If the timeout is reached without valid data (*data_valid=1) the function exits.*/ 00296 ); 00297 00298 //! Reads new data (even after a mode change) by flushing old data and waiting for the data_valid bit to be set. 00299 //! This function simplifies adc reads when modes are changing. For example, if V1-V2 changes from temperature mode 00300 //! to differential voltage mode, the data in the register may still correspond to the temperature reading immediately 00301 //! after the mode change. Flushing one reading and waiting for a new reading guarantees fresh data is received. 00302 //! If the timeout is reached without valid data (*data_valid=1) the function exits. 00303 //! @return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge. 00304 int8_t LTC2991_adc_read_new_data(uint8_t i2c_address, //!< I2C address of the LTC2991. Configured by tying the ADR0, ADR1, and ADR2 pins high or low. See Table 1 of datasheet. 00305 uint8_t msb_register_address, /*!< Address of the LTC2991 MSB register to be read. This is also known as the "command byte". 00306 Two sequential 8-bit registers will be read, starting with the msb_register_address.*/ 00307 int16_t *adc_code, //!< returns 14-bit value read from the adc 00308 int8_t *data_valid, //!< returns the status of the DATA_VALID bit. *data_valid=0 indicates stale data 00309 uint16_t timeout /*!< maximum timeout in millisceonds. If at any time a NACK is received the function aborts. 00310 If the timeout is reached without valid data (*data_valid=1) the function exits.*/ 00311 ); 00312 00313 //! Reads an 8-bit register from the LTC2991 using the standard repeated start format. 00314 //! @return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge. 00315 int8_t LTC2991_register_read(uint8_t i2c_address, //!< I2C address of the LTC2991. Configured by tying the ADR0, ADR1, and ADR2 pins high or low. See Table 1 of datasheet. 00316 uint8_t register_address, //!< Address of the LTC2991 register to be read. This is also known as the "command byte". 00317 uint8_t *register_data //!< returns 8-bit value read from the LTC2991 register. 00318 ); 00319 00320 //! Write one byte to an LTC2991 register. 00321 //! Writes to an 8-bit register inside the LTC2991 using the standard I2C repeated start format. 00322 //! @return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge. 00323 int8_t LTC2991_register_write(uint8_t i2c_address, //!< I2C address of the LTC2991. Configured by tying the ADR0, ADR1, and ADR2 pins high or low. See Table 1 of datasheet. 00324 uint8_t register_address, //!< Address of the LTC2991 register to be overwritten. This is also known as the "command byte". 00325 uint8_t register_data //!< Value that will be written to the register. 00326 ); 00327 00328 00329 //! Used to set and clear bits in a control register. bits_to_set will be bitwise OR'd with the register. 00330 //! bits_to_clear will be inverted and bitwise AND'd with the register so that every location with a 1 will result in a 0 in the register. 00331 //! @return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge. 00332 int8_t LTC2991_register_set_clear_bits(uint8_t i2c_address, //!< I2C address of the LTC2991. Configured by tying the ADR0, ADR1, and ADR2 pins high or low. See Table 1 of datasheet. 00333 uint8_t register_address, //!< Address of the LTC2991 register to be modified. 00334 uint8_t bits_to_set, //!< bits_to_set will be bitwise OR'd with the register. 00335 uint8_t bits_to_clear //!< bits_to_clear will be inverted and bitwise AND'd with the register 00336 ); 00337 00338 //! Calculates the LTC2991 single-ended input voltages 00339 //! @return the single-ended voCalculatesltage in volts 00340 float LTC2991_code_to_single_ended_voltage(int16_t adc_code, //!< code read from the adc (from a function such as LTC2991_adc_read) 00341 float LTC2991_single_ended_lsb //!< single-ended LSB weight. If not calibrated, use LTC2991_SINGLE_ENDED_LSB 00342 ); 00343 00344 //! Calculates the LTC2991 Vcc voltage 00345 //! @return the Vcc voltage in volts 00346 float LTC2991_code_to_vcc_voltage(int16_t adc_code, //!< code read from the adc (from a function such as LTC2991_adc_read) 00347 float LTC2991_single_ended_lsb //!< Vcc LSB weight. If not calibrated, use LTC2991_VCC_LSB 00348 ); 00349 00350 //! Calculates the LTC2991 differential input voltage. 00351 //! @return the differential voltage in volts 00352 float LTC2991_code_to_differential_voltage(int16_t adc_code, //!< code read from the adc (from a function such as LTC2991_adc_read) 00353 float LTC2991_differential_lsb //!< differential LSB weight. If not calibrated, use LTC2991_DIFFERENTIAL_LSB 00354 ); 00355 00356 //! Calculates the LTC2991 temperature 00357 //! @return the temperature in degrees Celsius or degrees Kevlin (dependent on mode setting). 00358 float LTC2991_temperature(int16_t adc_code, //!< code read from the adc (from a function such as LTC2991_adc_read). 00359 float LTC2991_temperature_lsb, //!< temperature LSB weight. If not calibrated, use LTC2991_TEMPERATURE_LSB 00360 boolean unit //!< The temperature unit, true for Kelvin, false for Celsius 00361 ); 00362 00363 //! Calcultates the LTC2991 diode voltage 00364 //! @return the diode voltage in volts. 00365 float LTC2991_code_to_diode_voltage(int16_t adc_code, //!< code read from the adc (from a function such as LTC2991_adc_read) 00366 float LTC2991_diode_voltage_lsb //!< diode voltage LSB weight. If not calibrated, use LTC2991_DIODE_VOLTAGE_LSB 00367 ); 00368 }; 00369 #endif // LTC2991_H
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