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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC2992: Dual Wide Range Power Monitor. More...
Files | |
file | LTC2992.cpp |
Header for LTC2992: Dual Wide Range Power Monitor. | |
file | LTC2992.h |
LTC2992: Dual Wide Range Power Monitor. | |
file | DC2561.ino |
LTC2992: Dual Wide Range Power Monitor. | |
LTC2992: Dual Wide Range Power Monitor.
The LTC®2992 is a rail-to-rail system monitor that measures current, voltage, power, charge and energy. It features an operating range of 2.7V to 100V and includes a shunt regulator for supplies above 100V. The current measurement common mode range of 0V to 100V is independent of the input supply. A 12-bit ADC measures load current, input voltage and an auxiliary external voltage. Load current and internally calculated power are integrated over an external clock or crystal or internal oscillator time base for charge and energy. An accurate time base allows the LTC2992 to provide measurement accuracy of better than ±0.6% for charge and ±1% for power and energy. Minimum and maximum values are stored and an overrange alert with programmable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface. Shutdown mode reduces power consumption to 15uA. I2C DATA FORMAT (MSB FIRST): Data Out: Byte #1 Byte #2 Byte #3 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK X X C5 C4 C3 C2 C1 C0 SACK D7 D6 D5 D4 D3 D2 D1 D0 SACK STOP Data In: Byte #1 Byte #2 Byte #3 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK X X C5 C4 C3 C2 C1 C0 SACK Repeat Start SA6 SA5 SA4 SA3 SA2 SA1 SA0 R SACK Byte #4 Byte #5 MSB LSB D15 D14 D13 D12 D11 D10 D9 D8 MACK D7 D6 D5 D4 D3 D2 D1 D0 MNACK STOP START : I2C Start Repeat Start: I2c Repeat Start STOP : I2C Stop SAx : I2C Address SACK : I2C Slave Generated Acknowledge (Active Low) MACK : I2C Master Generated Acknowledge (Active Low) MNACK : I2c Master Generated Not Acknowledge W : I2C Write (0) R : I2C Read (1) Cx : Command Code Dx : Data Bits X : Don't care Example Code: Read power, current and voltage CTRLA = LTC2992_CHANNEL_CONFIG_V_C_3|LTC2992_SENSE_PLUS|LTC2992_OFFSET_CAL_EVERY|LTC2992_ADIN_GND; //! Set Control A register to default value in continuous mode ack |= LTC2992_write(LTC2992_I2C_ADDRESS, LTC2992_CTRLA_REG, CTRLA); //! Sets the LTC2992 to continuous mode resistor = .02; // Resistor Value On Demo Board ack |= LTC2992_read_24_bits(LTC2992_I2C_ADDRESS, LTC2992_POWER_MSB2_REG, &power_code); // Reads the ADC registers that contains V^2 power = LTC2992_code_to_power(power_code, resistor, LTC2992_Power_lsb); // Calculates power from power code, resistor value and power lsb ack |= LTC2992_read_12_bits(LTC2992_I2C_ADDRESS, LTC2992_DELTA_SENSE_MSB_REG, ¤t_code); // Reads the voltage code across sense resistor current = LTC2992_code_to_current(current_code, resistor, LTC2992_DELTA_SENSE_lsb); // Calculates current from current code, resistor value and current lsb ack |= LTC2992_read_12_bits(LTC2992_I2C_ADDRESS, LTC2992_SENSE_MSB_REG, &SENSE_code); // Reads SENSE voltage code SENSE = LTC2992_SENSE_code_to_voltage(SENSE_code, LTC2992_SENSE_lsb); // Calculates SENSE voltage from SENSE code and lsb ack |= LTC2992_read_32_bits(LTC2992_I2C_ADDRESS, LTC2992_ENERGY_MSB3_REG, &energy_code); // Reads energy code energy = LTC2992_code_to_energy(energy_code,resistor,LTC2992_Power_lsb, LTC2992_INTERNAL_TIME_lsb); //Calculates Energy in Joules from energy_code, resistor, power lsb and time lsb ack |= LTC2992_read_32_bits(LTC2992_I2C_ADDRESS, LTC2992_CHARGE_MSB3_REG, &charge_code); // Reads charge code charge = LTC2992_code_to_coulombs(charge_code,resistor,LTC2992_DELTA_SENSE_lsb, LTC2992_INTERNAL_TIME_lsb); //Calculates charge in coulombs from charge_code, resistor, current lsb and time lsb
http://www.linear.com/product/LTC2992
http://www.linear.com/product/LTC2992#demoboards
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