Electronic Design

Auto Battery Monitors Improve Electrical System Performance

To meet the growing need to continuously monitor battery capacity and intelligently manage power distribution in automotive electrical systems, Analog Devices has introduced the ADuC703x family of highly integrated precision battery monitors. Operating even while the engine is off, the devices' 16-bit sigma-delta analog-to-digital converters measure battery voltage (direct connection, no external attenuation required) in the range of 3.5 to 18 V, and battery current from less than 1 mA to 1500 A. They consume less than 300 µA in low-power mode and less than 10 mA at 10 MHz in normal operating mode.

The chips integrate up to three 16-bit ADCs, an ARM7 microcontroller, a local interconnect network (LIN) transceiver, embedded flash memory, an on-chip programmable gain amplifier, on-chip attenuation resistors, and external or on-chip temperature sensing. A proprietary algorithm that resides in the flash memory determines the battery's state-of-charge (SOC) and state-of-health (SOH). These are used to control battery charging and discharging profiles to ensure improved battery dependability and prolong life, while providing priority to critical functions, such as engine start-up. The parts can be programmed in-circuit via a JTAG or LIN interface, with flash storage retention of 20 years at 85°C. Operating temperature range is \[minus sign\]40 to +125°C, with all specifications applicable up to +115°C.


The ADuC703x family is sampling now with full production scheduled for November.


The ADuC7030/2 (32k flash, 4k RAM, five timers) costs $6.73. The ADuC7032/3 (96k/6k/four timers) is $7.55. The ADuC7033/2 (96k/6k/five timers) is $7.10. All prices are for 1000-piece quantities.


Visit www.analog.com/pr/ADuC7030.

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