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LTC2944.cpp
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1 /*!
2 LTC2944: Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement
3
4 @verbatim
5
6 The LTC®LTC2944 measures battery charge state, battery voltage,
7 battery current and its own temperature in portable
8 product applications. The wide input voltage range allows
9 use with multicell batteries up to 60V. A precision coulomb
10 counter integrates current through a sense resistor between
11 the battery’s positive terminal and the load or charger.
12 Voltage, current and temperature are measured with an
13 internal 16-bit No Latency ΔΣ™ ADC. The measurements
14 are stored in internal registers accessible via the onboard
15 I2C/SMBus Interface
16
17 @endverbatim
18
19 http://www.linear.com/product/LTC2944
20
21 http://www.linear.com/product/LTC2944#demoboards
22
23
24 Copyright 2018(c) Analog Devices, Inc.
25
26 All rights reserved.
27
28 Redistribution and use in source and binary forms, with or without
29 modification, are permitted provided that the following conditions are met:
30 - Redistributions of source code must retain the above copyright
31 notice, this list of conditions and the following disclaimer.
32 - Redistributions in binary form must reproduce the above copyright
33 notice, this list of conditions and the following disclaimer in
34 the documentation and/or other materials provided with the
35 distribution.
36 - Neither the name of Analog Devices, Inc. nor the names of its
37 contributors may be used to endorse or promote products derived
38 from this software without specific prior written permission.
39 - The use of this software may or may not infringe the patent rights
40 of one or more patent holders. This license does not release you
41 from the requirement that you obtain separate licenses from these
42 patent holders to use this software.
43 - Use of the software either in source or binary form, must be run
44 on or directly connected to an Analog Devices Inc. component.
45
46 THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
47 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
48 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
49 IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
50 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
51 LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
52 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
53 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
54 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
55 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
56 */
57
58 //! @ingroup Power_Monitors
59 //! @{
60 //! @defgroup LTC2944 LTC2944: Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement
61 //! @}
62
63 /*! @file
64 @ingroup LTC2944
65 Library for LTC2944 Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement
66 */
67
68
69 #include <Arduino.h>
70 #include <stdint.h>
71 #include "Linduino.h"
72 #include "LT_I2C.h"
73 #include "LTC2944.h"
74 #include <Wire.h>
75
76 // Write an 8-bit code to the LTC2944.
77 int8_t LTC2944_write(uint8_t i2c_address, uint8_t adc_command, uint8_t code)
78 // The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
79 {
80 int32_t ack;
81
82 ack = i2c_write_byte_data(i2c_address, adc_command, code);
83 return(ack);
84 }
85
86
87 // Write a 16-bit code to the LTC2944.
88 int8_t LTC2944_write_16_bits(uint8_t i2c_address, uint8_t adc_command, uint16_t code)
89 // The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
90 {
91 int8_t ack;
92
93 ack = i2c_write_word_data(i2c_address, adc_command, code);
94 return(ack);
95 }
96
97 // Reads an 8-bit adc_code from LTC2944
98 int8_t LTC2944_read(uint8_t i2c_address, uint8_t adc_command, uint8_t *adc_code)
99 // The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
100 {
101 int32_t ack;
102
103 ack = i2c_read_byte_data(i2c_address, adc_command, adc_code);
104
105 return(ack);
106 }
107
108 // Reads a 16-bit adc_code from LTC2944
109 int8_t LTC2944_read_16_bits(uint8_t i2c_address, uint8_t adc_command, uint16_t *adc_code)
110 // The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
111 {
112 int32_t ack;
113
114 ack = i2c_read_word_data(i2c_address, adc_command, adc_code);
115
116 return(ack);
117 }
118
119
120 float LTC2944_code_to_coulombs(uint16_t adc_code, float resistor, uint16_t prescalar)
121 // The function converts the 16-bit RAW adc_code to Coulombs
122 {
123 float coulomb_charge;
124 coulomb_charge = 1000*(float)(adc_code*LTC2944_CHARGE_lsb*prescalar*50E-3)/(resistor*4096);
125 coulomb_charge = coulomb_charge*3.6f;
126 return(coulomb_charge);
127 }
128
129 float LTC2944_code_to_mAh(uint16_t adc_code, float resistor, uint16_t prescalar )
130 // The function converts the 16-bit RAW adc_code to mAh
131 {
132 float mAh_charge;
133 mAh_charge = 1000*(float)(adc_code*LTC2944_CHARGE_lsb*prescalar*50E-3)/(resistor*4096);
134 return(mAh_charge);
135 }
136
137 float LTC2944_code_to_voltage(uint16_t adc_code)
138 // The function converts the 16-bit RAW adc_code to Volts
139 {
140 float voltage;
141 voltage = ((float)adc_code/(65535))*LTC2944_FULLSCALE_VOLTAGE;
142 return(voltage);
143 }
144
145 float LTC2944_code_to_current(uint16_t adc_code, float resistor)
146 // The function converts the 16-bit RAW adc_code to Amperes
147 {
148 float current;
149 current = (((float)adc_code-32767)/(32767))*((float)(LTC2944_FULLSCALE_CURRENT)/resistor);
150 return(current);
151 }
152
153 float LTC2944_code_to_kelvin_temperature(uint16_t adc_code)
154 // The function converts the 16-bit RAW adc_code to Kelvin
155 {
156 float temperature;
157 temperature = adc_code*((float)(LTC2944_FULLSCALE_TEMPERATURE)/65535);
158 return(temperature);
159 }
160
161 float LTC2944_code_to_celcius_temperature(uint16_t adc_code)
162 // The function converts the 16-bit RAW adc_code to Celcius
163 {
164 float temperature;
165 temperature = adc_code*((float)(LTC2944_FULLSCALE_TEMPERATURE)/65535) - 273.15;
166 return(temperature);
167 }
168
169 // Used to set and clear bits in a control register. bits_to_set will be bitwise OR'd with the register.
170 // 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.
171 int8_t LTC2944_register_set_clear_bits(uint8_t i2c_address, uint8_t register_address, uint8_t bits_to_set, uint8_t bits_to_clear)
172 {
173 uint8_t register_data;
174 int8_t ack = 0;
175
176 ack |= LTC2944_read(i2c_address, register_address, &register_data);
177 register_data = register_data & (~bits_to_clear);
178 register_data = register_data | bits_to_set;
179 ack |= LTC2944_write(i2c_address, register_address, register_data);
180 return(ack);
181 }
182
183
184
LTC2944_register_set_clear_bits
int8_t LTC2944_register_set_clear_bits(uint8_t i2c_address, uint8_t register_address, uint8_t bits_to_set, uint8_t bits_to_clear)
Definition: LTC2944.cpp:171
i2c_address
uint8_t i2c_address
adc_command
static uint8_t adc_command
Definition: DC2071AA.ino:111
i2c_read_byte_data
int8_t i2c_read_byte_data(uint8_t address, uint8_t command, uint8_t *value)
Read a byte of data at register specified by "command", store in "value".
Definition: LT_I2C.cpp:124
resistor
const float resistor
resistor value on demo board
Definition: DC1496BB.ino:116
LTC2944_FULLSCALE_CURRENT
const float LTC2944_FULLSCALE_CURRENT
Definition: LTC2944.h:207
Linduino.h
Header File for Linduino Libraries and Demo Code.
LTC2944_code_to_celcius_temperature
float LTC2944_code_to_celcius_temperature(uint16_t adc_code)
Calculate the LTC2944 temperature.
Definition: LTC2944.cpp:161
LTC2944_code_to_mAh
float LTC2944_code_to_mAh(uint16_t adc_code, float resistor, uint16_t prescalar)
Calculate the LTC2944 charge in mAh.
Definition: LTC2944.cpp:129
LTC2944_read
int8_t LTC2944_read(uint8_t i2c_address, uint8_t adc_command, uint8_t *adc_code)
Reads an 8-bit adc_code from LTC2944.
Definition: LTC2944.cpp:98
LTC2944_FULLSCALE_VOLTAGE
const float LTC2944_FULLSCALE_VOLTAGE
Definition: LTC2944.h:206
i2c_write_word_data
int8_t i2c_write_word_data(uint8_t address, uint8_t command, uint16_t value)
Write a 16-bit word of data to register specified by "command".
Definition: LT_I2C.cpp:216
i2c_write_byte_data
int8_t i2c_write_byte_data(uint8_t address, uint8_t command, uint8_t value)
Write a byte of data to register specified by "command".
Definition: LT_I2C.cpp:155
LTC2944_code_to_kelvin_temperature
float LTC2944_code_to_kelvin_temperature(uint16_t adc_code)
Calculate the LTC2944 temperature.
Definition: LTC2944.cpp:153
LTC2944_code_to_voltage
float LTC2944_code_to_voltage(uint16_t adc_code)
Calculate the LTC2944 SENSE+ voltage.
Definition: LTC2944.cpp:137
LTC2944_FULLSCALE_TEMPERATURE
const float LTC2944_FULLSCALE_TEMPERATURE
Definition: LTC2944.h:208
LTC2944_write_16_bits
int8_t LTC2944_write_16_bits(uint8_t i2c_address, uint8_t adc_command, uint16_t code)
Write a 16-bit code to the LTC2944.
Definition: LTC2944.cpp:88
i2c_read_word_data
int8_t i2c_read_word_data(uint8_t address, uint8_t command, uint16_t *value)
Read a 16-bit word of data from register specified by "command".
Definition: LT_I2C.cpp:172
LT_I2C.h
LT_I2C: Routines to communicate with ATmega328P&#39;s hardware I2C port.
LTC2944_read_16_bits
int8_t LTC2944_read_16_bits(uint8_t i2c_address, uint8_t adc_command, uint16_t *adc_code)
Reads a 16-bit adc_code from LTC2944.
Definition: LTC2944.cpp:109
LTC2944_CHARGE_lsb
const float LTC2944_CHARGE_lsb
Definition: LTC2944.h:202
LTC2944.h
LTC2944: Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement.
E
const int16_t E
Definition: LTC2492_Thermocouple_Meter.ino:101
voltage
static float voltage
Definition: DC2289AA.ino:71
current
static uint16_t current
the current measurement from the LTC3335&#39;s counter test mode.
Definition: DC2343A.ino:114
LTC2944_code_to_current
float LTC2944_code_to_current(uint16_t adc_code, float resistor)
Calculate the LTC2944 current with a sense resistor.
Definition: LTC2944.cpp:145
adc_code
static uint32_t adc_code
Definition: DC2071AA.ino:113
LTC2944_write
int8_t LTC2944_write(uint8_t i2c_address, uint8_t adc_command, uint8_t code)
Write an 8-bit code to the LTC2944.
Definition: LTC2944.cpp:77
LTC2944_code_to_coulombs
float LTC2944_code_to_coulombs(uint16_t adc_code, float resistor, uint16_t prescalar)
Calculate the LTC2944 charge in Coulombs.
Definition: LTC2944.cpp:120