24 October 2012
Freescale has ‘intelligent’ sensor for automotive battery monitoring
Freescale has introduced the MM9Z1J638 Xtrinsic battery sensor, a CAN based solution designed to accurately measure the voltage, current and temperature of lead acid and Li-ion batteries, as well as calculate the battery state.
The device integrates an S12Z microcontroller and a SMARTMOS analogue control integrated circuit in a single package solution, providing low power consumption in automotive and industrial environments. It is fully AEC-Q100 automotive qualified for operation from -40 to 125°C and comes in a small 7 x 7mm QFN package.
"Devices such as the intelligent battery sensor are becoming necessary as electronic content and start-stop systems in automobiles continue to increase in quantity and importance," said Gavin Woods, vice president and general manager of Freescale's analogue and mixed signal products division. "We are providing the industry's first CAN based, automotive qualified and cost effective solution that enables precise monitoring of critical battery parameters."
The MM9Z1J638 includes a two channel, 16 bit a/d converter for simultaneous measurement of battery voltage and current, and an independent 16bit a/d converter for temperature measurement.
The battery sensor is designed to provide accurate monitoring with high resolution even in worst case conditions. It supports precise current measurement via an external shunt resistor at the negative terminal and precise battery voltage measurement via a series resistor at the positive terminal.
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