Measures up High voltage I2C current and voltage monitor




Description

The LTC4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V. In default operation mode, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage. Data is reported through the I2C interface when polled by a host. The LTC4151 can also perform on-demand measurement in a snapshot mode. The LTC4151 features a dedicated shutdown pin to reduce power consumption. The LTC4151-1/LTC4151-2 feature split I2C data pins to drive opto-isolators. The data out on the LTC4151-1 is inverted while that on the LTC4151-2 is not.

Features

  • Wide Operating Voltage Range: 7V to 80V
  • 12-Bit Resolution for Both Current and Voltages
  • I2C Interface
  • Additional ADC Input Monitors an External Voltage Continuous Scan and Snapshot Modes
  • Shutdown Mode (LTC4151) Reduces Quiescent Current to 120μA
  • Split SDA for Opto-isolation (LTC4151-1/LTC4151-2)
  • Available in 10-Lead MSOP, 10-Lead 3mm × 3mm DFN and 16-Lead SO Packages

Applications

  • Telecom Infrastructure
  • Automotive
  • Industrial
  • Consumer

Measures up High voltage I2C current and voltage monitor




Because of the wide operating range, the LTC4151 is useful in systems ranging from telecom to automotive.  By integrating all of the necessary functional blocks in a single-chip solution, power monitoring is made practical in applications where a discrete solution is out of the question due to space or cost.

Simple, Sophisticated
The LTC4151 finds its way into many complex, space-constrained, low voltage applications including RAID systems, telecoms and industrial control systems.  Fortunately, only a few simple connections need to be made to this device, available in a small MS10 or tiny 3mm x 3mm DFN package.  Depending on the system, the monitoring IC could be located on the backplane or on a removable card; Figure 2 is an example of the latter, which shows the LTC4151 monitoring the input current and voltage to a 12V DC/DC converter.  Here, the low voltage input, ADIN, is used to measure the 5V output of the converter, while a direct I2C connection is made to the microprocessor.  The only required external components are a sense resistor, two bus pull-up resistors and a resistive divider for 5V measurement on ADIN.

 

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