Recently released by austriamicrosystems is the AS8510, a high-precision data acquisition front-end IC for automotive battery current, voltage, temperature sense applications and in general for sensor interface applications where precise measurement of small signals close to ground is required.
The IC features a 16-bit dual-channel ADC + PGA architecture with less than one LSB of offset and noise. Highly configurable, it allows systems tailored to individual needs, making it well suited for a wide range of battery management applications. The AS8510, in combination with austriamicrosystems ‘System Basis Chip’ and a microcontroller, provides an entire battery sensor semiconductor solution for both high-side and low-side.
The AS8510 boasts two independent analog input channels with 16-bit ADCs, each with individually programmable sampling rates. Each channel has a low-drift programmable gain amplifier for handling ±160 mV signals or 0 V to 1 V when bypassing the PGA; thus battery currents from the mA range to the kA range can be measured from a 100 μΩ shunt. A highly linear sigma delta architecture and wide range of sampling rates allows the AS8510 to provide flexible support for EV (electric vehicle) applications. The offset auto-zero feature (both channels) allows high accuracy measurements with low value shunt resistance with negligible insertion loss. Also, various operating modes include low-power standby with current monitoring for active wake-up.
The chip operates with the current shunt sensor in a 12 V system either at a battery’s ground terminal or at the plus terminal in conjunction with a dedicated level shift companion IC, or it can be used as a general-purpose sensor interface for precise measurement of signals close to ground. Fully differential inputs allow it to capture differential signals with 300 mV of common-mode above ground and 160 mV below ground. The two-channel architecture enables digital error correction techniques like ‘delta by sigma’ division or capture of bridge current/voltages with subsequent error correction in an external microcontroller.
The AS8510 can be configured for differential simultaneous two-channel operation, or for multiplexing two single-ended channels in addition to one of the differential channels for sequential measurements. In addition to measuring voltage and current, it also allows accurate temperature measurement from either the internal sensor or from an external temperature sensor, which may be powered by an on-chip current source. The IC includes an internal precision reference, integrated digital low-pass filters, on-chip precision oscillators and a four-wire SPI interface. It is available in a SSOP20 package, operates from 3,3 V, and has an ambient operating temperature range of -40°C to +125°C.
For more information contact ASIC Design Services, +27 (0)11 315 8316, [email protected], www.asic.co.za, NuVision Electronics, +27 (0)11 894 8214, [email protected], www.nuvisionelec.co.za
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