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I2C chip monitors 0-80V power rails

Posted: 21 Nov 2012     Print Version  Bookmark and Share

Keywords:power  system  monitor  I<sup>2</sup>C  IC 

Linear Technology Corp. launches the LTC2945, a wide range I2C system monitor that monitors the current, voltage and power of any 0V to 80V rail. The single-chip solution uses an internal Delta Sigma ADC and multiplier to provide 12bit current and voltage measurements and 24bit power readings.

It derives power from a 4V to 80V monitored supply, a 2.7V to 80V secondary supply, or from the on-board shunt regulator. These supply options eliminate the need for a separate buck regulator, shunt regulator or inefficient resistive divider while monitoring any 0V to 80V rail. Previous power monitoring solutions are often limited to 3V to 5V supplies, monitoring voltages less than 36V and needing additional circuitry to monitor higher voltages.

The wide operating range suits the device for 48V telecom equipment, advanced mezzanine cards (AMC) and blade servers. An on-board shunt regulator provides support for supplies greater than 80V and negative supply monitoring.

The LTC2945 measures current and voltage both continuously or on-demand, calculates power, and stores all of this information along with minimum and maximum values in I2C accessible registers. Measurements are made with only ±0.75 per cent of total unadjusted error (TUE) over the entire temperature range. If any parameter exceeds the user-programmable limits, the LTC2945 flags an alert register and pin per the SMBus alert response protocol.

The 400kHz I2C interface features nine device addresses, a stuck bus reset timer and a split SDA pin that simplifies I2C opto-isolation. A LTC2945-1 version offers an inverted data output I2C pin for use with inverting opto-isolator configurations.

The LTC2945 and LTC2945-1 are offered in commercial and industrial versions, supporting operating temperature ranges from 0°C to 70°C and -40°C to 85°C, respectively. Both versions are available in 12-pin 3mm x 3mm QFN and 12-lead MSOP RoHS-compliant packages. Pricing starts at Rs.188.89 ($3.57) in 1,000 piece quantities.

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