Linear Technology Corporation introduces the LTC2946, a high or low side charge, power and energy monitor for dc supply rails in the 0V to 100V range. An integrated ±0.4% accurate, 12-bit ADC and external precision time base (crystal or clock) enables measurement accuracy better than ±0.6% for current and charge, and ±1% for power and energy. A ±5% accurate internal time base substitutes in the absence of an external one. All digital readings, including minimums and maximums of voltage, current and power, are stored in registers accessible by an I2C/SMBus interface. An alert output signals when measurements exceed configurable warning thresholds, relieving the host of burdensome polling for data.
The LTC2946 provides access to all the necessary parameters to accurately assess and manage board level energy consumption. In addition its wide operating range makes it suited for monitoring board energy consumption in blade servers, telecom, solar and industrial equipment, and advanced mezzanine cards (AMC).
The LTC2946 can be powered from 2.7V to 5V directly, from 4V to 100V through an internal linear regulator, or beyond 100V through an internal shunt regulator. Two of the three general purpose input/output (GPIO) pins are configurable as an accumulator enable and alert output. The internal ADC operates in either a continuous scan mode or a snapshot mode. In shutdown mode, the device current consumption drops from 900µA to 15µA.
The LTC2946 is available in two options: the LTC2946 I2C interface has separate SDA input and output pins for standard or opto-isolated I2C, whereas the LTC2946-1 has an inverted SDA output for inverting opto-isolator configurations. Specified over the commercial, industrial, automotive and military temperature ranges, the LTC2946 is offered in 16-pin MSOP and 4mm x 3mm DFN packages. 1,000-piece pricing starts at $3.95 each.
