David Manners wrote an article for Electronics Weekly talking about how Linear Tech has a new power and energy monitor. This Monitor accessory is for 0V to 15C DC supply rails.
The LTC2947 has a sense resistor that integrates a 300µO temperature. By doing this, the LTC2947 provides users with a 24mm2 which can allow for a 1.2% accurate energy reading. Here is what else Manners says about the monitors.
“When measuring a full-scale current of 30A, the voltage drop over the LTC2947’s integrated voltage regulator module is only about 9mV, causing power dissipation of approximately a quarter watt or about 10mW when measuring a 6A rail.
In addition to low power dissipation, the LTC2947 offers high dynamic range due to its low offset of only 6mA (or 1.8µV).
Three integrated ?? ADCs and an internal or external precision time base (crystal or clock) enable accurate measurement of multiple parameters, including current, voltage, power, charge, energy, temperature and time.”
There is an I2C or SPI interface where minimum and maximum values are able to be read through the digital reading. Whenever the measurements exceed the warning threshold, there is an alert that goes off. This alert lets eliminating burdensome polling.
The LTC2947 is offered in a 32 lead 4mm x 6mm QFN package. These start at 1,000 piece at $5.95 each.
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