PDF LTC2947 Data sheet ( Hoja de datos )

Número de pieza	LTC2947
Descripción	30A Power/Energy Monitor
Fabricantes	Linear Technology
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No Preview Available ! LTC2947 30A Power/Energy Monitor with Integrated Sense Resistor Features nn Measures Current, Voltage, Power, Charge, Energy nn ±30A Current Range with Low 9mA Offset nn Integrated 300µΩ Sense Resistor nn 0V to 15V Input Range Independent of Supply Voltage nn Instantaneous Multiplication of Voltage and Current nn 0.5% Voltage Accuracy nn 1% Current and Charge Accuracy nn 1.2% Power and Energy Accuracy nn Alerts When Thresholds Exceeded nn Stores Maximum and Minimum Values nn nn SI2hCu/StdPoIwCnomMpoadteibwleitIhntIeQr<fa1ce0μA nn Available in 32-Lead 4mm × 6mm QFN Package Applications nn Servers nn Telecom Infrastructure nn Industrial nn Electric Vehicles nn Photovoltaics Description The LTC®2947 is a high-precision power and energy monitor with an internal sense resistor supporting up to ±30A. Three internal No Latency Δ∑™ ADCs ensure accurate measurement of voltage and current, while high- bandwidth analog multiplication of voltage and current provides accurate power measurement in a wide range of applications. Internal or external clocking options enable precise charge and energy measurements. An internal 300µΩ, temperature-compensated sense resistor minimizes efficiency loss and external compo- nents, simplifying energy measurement applications while enabling high accuracy current measurement over the full temperature range. All measured quantities are stored in internal registers ac- cessible via the selectable I2C/SPI interface. The LTC2947 features programmable high and low thresholds for all measured quantities to reduce digital traffic with the host. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency ∆∑ and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 8907703, 8841962. Typical Application 0V TO 15V IP 300µΩ IM –30A TO 30A 5V AVCC 1µF AGND VP DVCC LTC2947 1µF DGND VM CFP 1µF CFM BYP 1µF AD1 AD0 CLKI OVDD SCL SDI SDO ALERT CLKO LOAD 5V SDI SDA I2C INTERFACE 2947 TA01a Energy Measurement Total Unadjusted Error vs Current, VP – VM = 12V 0.5 0.4 INTERNAL CLOCK EXTERNAL CLOCK 0.3 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 –0.5 0 10 20 ISENSE (A) 30 2947 TA01b For more information www.linear.com/LTC2947 2947f 1 1 page LTC2947 E lectrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Measurement Resolution (No Missing Codes) (Note 5) l 18 bit Full-Scale Power 450 W Power Quantization Step 50 mW Power Gain Error ±0.8 % of reading l ±1 % of reading Power Offset ±4 LSB l ±6 LSB INLP Power Integral Nonlinearity \|I\| ≥ 6A, VD ≥ 12V (Note 6) l ±0.3 % of reading ±0.5 % of reading TUEP Power Total Unadjusted Error \|I\| ≥ 6A, VD ≥ 12V (Note 6) l ±1.2 % of reading ±1.5 % of reading Sampling Rate 5.25 MHz Timing TUETB Time Base Total Unadjusted Error Internal Clock l ±0.5 % of reading ±1 % of reading Ideal External Clock or Ideal 4MHz Crystal (Note 5) l ±340 ppm tUPDATE Update Time of Result Registers Energy Measurement l 95 100 105 ms TUEE Energy Total Unadjusted Error \|I\| ≥ 6A, (Note 6) VD ≥ 12V, Ideal External Clock l ±1.2 % of reading ±1.5 % of reading \|I\| ≥ 6A, (Note 6) VD ≥ 12V, Internal Clock l ±1.5 % of reading ±2.5 % of reading Charge Measurement TUEC Charge Total Unadjusted Error \|I\| ≥ 6A, Ideal External Clock (Note 6) l ±1 % of reading ±1.5 % of reading \|I\| ≥ 6A, Internal Clock (Note 6) l ±1.5 % of reading ±2.5 % of reading Temperature Measurement ADC Resolution (No Missing Codes) (Note 5) l 13 bit Temperature Quantization Step 0.204 °C Temperature Error (Note 5) ±5 K Digital Inputs and Digital Outputs SCL, SDI, GPIO, ALERT, SDO, CS, CLKI, ADO VITH Logic Input Threshold SCL, SDI, GPIO, CS, ADO l 0.3 • VOVDD 0.7 • VOVDD IIN Input Current SCL, SDI, GPIO l ±1 CIN Input Capacitance (Note 5) l 10 VOL Low Level Output Voltage SDO, GPIO, VOVDD ≥ 3.3V, IPIN = 3mA l ALERT 1.8V ≤ VOVDD < 3.3V, IPIN = 1mA l 0.4 0.4 VOH High Level Output Voltage (SDO) ISDAO = –0.5mA l VOVDD – 0.5 CLKI Input Threshold l 0.4 0.7 2 V μA pF V V V V External Clock Frequency on Pin CLKI l 0.2 25 MHz For more information www.linear.com/LTC2947 2947f 5 5 Page Block Diagram LTC2947 CFP IP 50Ω RSENSE IM 300µΩ 50Ω CFM VP VM I ∑∆ 1ST ORDER MODULATOR P ∑∆ 1ST ORDER MODULATOR LPF LPF TEMP SENSOR AUX ∑∆ 1ST ORDER MODULATOR LPF AVCC LDO1 3.3V LDO2 3.3V DVCC BYP SHUTDOWN DOMAIN SUPPLY LDO3 2.5V LDO4 1.2V REFERENCE OSC AGND CLKI CLKO LTC2947 LOGIC & MEMORY STATUS CONTROL CURRENT THRESHOLDS CURRENT CURRENT TRACKING POWER THRESHOLDS POWER POWER TRACKING VOLTAGE THRESHOLDS VOLTAGE VOLTAGE TRACKING TEMP. THRESHOLDS TEMPERATURE TEMP. TRACKING CURRENT HISTORY CHARGE THRESHOLDS CHARGE 1 & 2 CHARGE TRACKING ENERGY THRESHOLDS ENERGY 1 & 2 ENERGY TRACKING TIME 1 & 2 ... SEE REGISTER MAP... OVDD I2C OR SPI I/O SCL SDO SDI AD1/CS AD0 GPO/ALERT CONTROL ALERT M1 NMOS DGND M2 NMOS GPIO 2947 BD For more information www.linear.com/LTC2947 2947f 11 11 Page

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