Analog Devices announced the ADuC703x family of battery monitor. Based on the analog 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 start-up.
Powered directly from the car battery, the single-chip ADuC703x devices integrate up to three 16-bit analog-to-digital converters (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. The family provides accurate, continuous measurement of battery state, even while the engine is off, while consuming as little as 300 μA in low-power mode and less than 10 mA at 10 MHz in normal operating mode. The devices’ 16-bit sigma-delta ADCs 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 A to 1500 A.
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 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 of the ADCs have an 8-kHz 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 60 nV 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 20 MHz. The parts can be programmed (in-circuit) via a JTAG (Joint Test Action Group) or LIN interface, with flash storage retention of 20 years at 85 degrees C. The new devices support a maximum power supply of 33 V with all specifications applying over the range of 3.5 V to 18 V.
Availability and Pricing
All devices in the ADuC703x family are sampling now with full production scheduled for November 2006. The operating temperature range is –40 degrees C to +125 degrees C with all specifications applicable up to +115 degrees C. Prices: between $6,73 and $7,55.
