Very Wide Range I2C Energy Monitor To Load 0V to 100V DC >2.7V VBIAS LTC2946 I2C/SMBus Precision Time Base Rail-to-Rail 100V Energy Monitor Measures Current and Charge with ±0.6% Accuracy The LTC®2946 is a very wide range I2C system monitor that monitors the energy, charge, current, voltage and power of any 0V to 100V rail. The LTC2946 has flexible power supply options, deriving power from a 4V to 100V monitored supply, a 2.7V to 100V secondary supply or from the onboard shunt regulator. These supply options eliminate the need for a separate buck regulator, shunt regulator or inefficient resistive divider while monitoring high voltages. An internal shunt regulator allows monitoring of supplies >100V and negative voltages. The LTC2946 is a simple, single-IC solution that uses an internal ∆∑ ADC, multiplier and internal or external time base to provide 12-bit current and voltage measurements, 24-bit power readings and 32-bit charge and energy readings. Features nn nn nn nn nn nn nn nn LTC2946 GUI Screenshot Monitors DC Supply Voltage, Current, Charge, Power and Energy Use 0V to 100V Monitoring Range, >100V with Internal Shunt Regulator 12-Bit ADC with Scan/Snapshot Modes Guaranteed Accuracy: ±1% for Power and Energy Internal ±5% or External Time Bases Bias Supply Range: 4V to 100V or 2.7V to 5.9V Split SDA Pin Eases Opto-Isolation 16-Pin MSOP and 4mm × 3mm DFN Packages L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Flexible Power Supply Options RSNS VIN 4V TO 100V SENSE+ RSNS VIN >100V VOUT SENSE– SENSE+ VDD VOUT SENSE– INTVCC VDD LTC2946 LTC2946 INTVCC GND GND RSHUNT LTC2946 Derives Power from the Supply Being Monitored RSNS VIN 0V TO 100V SENSE+ 4V TO 100V LTC2946 Derives Power Through High Side Shunt Regulator SENSE– >100V VDD RSNS VIN 0V TO 100V VOUT RSHUNT SENSE+ SENSE– INTVCC VDD LTC2946 VOUT LTC2946 INTVCC GND GND LTC2946 Derives Power from a Wide Range Secondary Supply RSNS VIN 0V TO 100V SENSE+ 2.7V TO 5.9V LTC2946 Derives Power Through Low Side Shunt Regulator in High Side Current Sense Topology GND RSHUNT VOUT SENSE– INTVCC INTVCC VDD VDD LTC2946 GND SENSE– GND VNEG >–100V LTC2946 Derives Power from a Low Voltage Secondary Supply LTC2946 SENSE+ RSNS VOUT LTC2946 Derives Power Through Low Side Shunt Regulator in Low Side Current Sense Topology www.linear.com/2946 n 1-800-4-LINEAR 0614