An integrated 12-bit A/D converter with ±0.4% accuracy and an external precision time base (crystal or clock) enable measurements with an accuracy better than ±0.6% for current and load, and ±1% for power and energy. An internal time base with ±5% accuracy is used when an external time base is unavailable. All digital readings, including minimum and maximum voltage, current, and power values, are stored in registers accessible via an I2C/SMBus interface. An alert signal is triggered at the output when measured values ​​exceed configurable warning thresholds, thus relieving the host of the burden of probing the data. The LTC2946 provides access to all the parameters necessary to accurately evaluate and manage the board's power consumption. Furthermore, its wide operating range makes it ideal for monitoring power consumption on blade servers, telecommunications, solar, and industrial equipment, as well as on advanced mezzanine cards (AMCs).
The LTC2946 can be powered directly from 2.7V to 5V, from 4V to 100V via an internal linear regulator, or above 100V with an internal shunt regulator. Two of the three GPIO (general purpose input/output) pins are configurable as battery activation and alert output signals. The internal A/D converter operates in continuous sweep or instantaneous mode. In power-off mode, the device's current consumption drops from 900µA to 15µA.
The LTC2946 is available in two versions: the LTC2946 I2C interface has separate SDA input and output pins for standard or optically isolated I2C, while the LTC2946-1 has an inverted SDA output for inverting opto-isolator configurations. Specified for commercial, industrial, automotive, and military temperature ranges, the LTC2946 is supplied in 16-pin MSOP and 4mm x 3mm DFN packages. Its starting price is $4.19 per unit for orders of 1,000 units.

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