The IC has an SPI interface and low threshold sensing capability. The sense input thresholds and hysteresis are programmable via the 20 MHz SPI port in 100-millivolt steps, from 0.4 to 5.2 volts and 32 sense output states may be read with one SPI command. In addition, the device has built-in lightning protection on the sense inputs.
The 32 sensing channels are divided into four banks of eight inputs, with each bank independently configurable over the SPI port. Users may implement a 32-channel solution using one device, or increase the number of sense channels on one SPI port by addressing several HI-8437 devices by their individual chip selects.
The device is available in an industrial operating temperature range of -40 to 85 degrees Celsius, and an extended-temperature operating range of -55 to 125 C. It also comes in several standard package options, including 44 pin PQFP and compact 7-by-7-millimeter 44-pin QFN. An Evaluation Kit, ADK-8437, also is available from Holt on request.
For more information contact Holt online at www.holtic.com.