Product category:
Power Supply ICs and Controllers
News Release from: Analog Devices | Subject: ADuC703x family
Edited by the Electronicstalk Editorial
Team on 17 October 2006
Battery monitor manages automotive power
Analog Devices is claiming a breakthrough in automotive battery monitoring with the introduction of the ADuC703x family of highly integrated, precision battery monitor.
Analog Devices is claiming a breakthrough in automotive battery monitoring with the introduction of the ADuC703x family of highly integrated, precision battery monitor With the increasing volume of electronic content in today's cars, coupled with the fact that 60% of all automotive electronics failures can be attributed to faulty or discharged batteries (according to the Allgemeiner Deutscher Automobil-Club), there is a growing need to continuously monitor battery capacity and intelligently manage power distribution in the automobile's electrical system
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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Based on the company's precision analogue microcontroller technology, the ADuC703x family precisely measures battery voltage, current and temperature, and uses these variables to determine the battery's state-of-charge (SOC) and state-of-health (SOH).
These metrics are subsequently used to control battery charging and discharging profiles in order to ensure improved battery dependability and prolong battery life, while providing priority to critical functions such as engine startup.
"Analog Devices' ability to design mixed-signal ICs that combine precision analogue functions with digital circuitry made them the obvious choice for an integrated solution for intelligent battery sensing", said Andreas Heim, BMW, Germany.
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"This new device family replaces more expensive and less accurate solutions using multiple discrete components".
"Automotive system designers now have an integrated solution that better enables a level of battery management to ensure critical tasks are always performed, eliminate breakdowns due to a flat battery and help prolong battery life".
Powered directly from the car battery, the single-chip ADuC703x devices integrate up to three 16bit analogue-to-digital convertors (ADCs), an ARM7 microcontroller, a local interconnect network (LIN) transceiver, embedded flash memory, an on-chip PGA (programmable gain amplifier) for a wide range of current measurements, on-chip attenuation resistors for direct battery voltage measurement and external or on-chip temperature sensing.
Therefore, the ADuC703x precision battery monitors offer a cost-efficient, space-saving and simpler design alternative to discrete implementations consisting of a stand-alone processor, LIN transceiver, low drop-out regulator (LDO) and analogue front end (AFE).
As a result, the component can be located directly on the negative battery pole to provide significant cost and space savings, while simplifying overall battery monitoring system design.
"The profusion of new safety, entertainment, navigation and power train systems in today's car relies on more sophisticated electronic subsystems", said Mike Britchfield, Product Line Director, Precision Signal Processing, Analog Devices.
"These exciting new features all improve automotive performance, but in every case demand exceptional battery management capabilities, leading to increased reliability and longer life".
"The level of integration provided by the ADuC703x family effectively meets these needs in a single-chip IC that is easier to use, higher performance and more cost effective than the existing patchwork solutions used today".
The ADuC703x family provides accurate, continuous measurement of battery state, even while the engine is off, consuming as little as 300A in low-power mode and less than 10mA at 10MHz in normal operating mode.
The devices' 16bit sigma-delta ADCs measure battery voltage (direct connection, no external attenuation required) in the range of 3.5 to 18V and battery current from less than 1mA to 1500A.
Combined with an on-chip PGA and a temperature sensor input, the ADuC703x allows the system integrator to determine the battery's SOC and SOH using a proprietary algorithm that resides in the monitor chip's Flash memory.
The information is then communicated via the on-chip LIN 2.0 (slave) compliant transceiver to the ECU (electronic control unit).
The new battery monitor family includes a dual-ADC version (ADuC7030/3) that monitors voltage and temperature in series and a version equipped with three ADCs (ADuC7032) that allows simultaneous voltage and temperature monitoring.
All the ADCs have an 8kHz maximum conversion rate.
The current-measuring ADC has a fully differential buffered input, the ability to independently monitor battery current in power-down mode and noise performance of 60nV RMS at low conversion rates.
An on-chip FIFO (ADuC7032 only) can store multiple voltage and current conversions when the core is busy.
The processing engine at the core of the ADuC703x series is an ARM7TDMI with a core clock rate that is programmable to a maximum of 20MHz.
The parts can be programmed (in-circuit) via a JTAG or LIN interface, with Flash storage retention of 20 years at 85C.
The new devices support a maximum power supply of 33V with all specifications applying over the range of 3.5 to 18V.
All devices in the ADuC703x family are sampling now with full production scheduled for November 2006.
The operating temperature range is -40 to +125C with all specifications applicable up to +115C.
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