|[December 12, 2012]
New AS8515 from ams Provides Integrated Solution for Automotive Battery Sensing
UNTERPREMSTAETTEN, Austria --(Business Wire)--
The AS8515 system-in-package (SiP) introduced today by ams AG (SIX:
AMS), a manufacturer of high-performance analog ICs and sensors for
consumer, industrial and automotive applications, enables the
implementation of a complete automotive battery measurement system when
interfaced via SPI to any microcontroller.
The device is a stacked-die package consisting of a signal-processing
die with two high-precision ADC (News - Alert) channels for current, voltage and
temperature measurements, and a high-voltage CMOS die providing voltage
regulation, a LIN transceiver and watchdog functions. Supporting
manufacturers' ISO26262 safety standard compliance processes, the device
is well suited for battery management systems (BMS) for lithium-ion
batteries in electric vehicles, hybrid electric vehicles and vehicles
with an internal combustion engine.
Providing precise and linear 16-bit digital outputs, the AS8515 is ideal
for implementing State of Charge (SoC) monitoring in automotive
batteries through measurement of open-circuit voltage and coulomb
counting. The device also provides extremely accurate and linear
conversion of small signals from other devices such as the pressure
sensors used in a vehicle's hydraulic, pneumatic or barometric systems.
By integrating voltage regulation and a LIN2.1 transeiver with
signal-processing circuitry in a single package, the AS8515 provides a
complete current and voltage measurement system that only requires the
addition of a simple microcontroller and, for current measurement, a
precision shunt resistor.
The bottom (signal processing) die in the AS8515 is the same die used in
the AS8510 sensor interface chip, which ams introduced in January 2011.
This is the automotive industry's best-performing current, voltage and
temperature sensor interface.
Offering two independent, high-resolution 16-bit ADC channels, it can
measure signals from sub- micro volt up to 200 mV and measure current
across a range from 1 mA to 2000A through a 100 micro Ohm shunt. All
measurements are offset-free and highly linear across the device's
specified ambient temperature range (-40°C to +115°C). The two channels
can be configured to measure the same input synchronously to provide a
redundant design supporting functional safety.
The top die in the SiP is a system basis chip (SBC) providing voltage
regulation via an LDO, a fully automotive- certified LIN 2.1
transceiver, and various system monitoring and protection features such
as power-on reset and a window watchdog function.
The AS8515, together with external micro and its I/O ports, offers full
flexibility to support use in lithium-ion BMS applications which require
multiple interfaces to support functions such as cell balancing.
Bernd Gessner, vice-president and general manager of the automotive
business unit at ams, said: "The AS8515 offers the right level of
integration for automotive battery system designers, combining power
management and LIN communications functions with precise and accurate
current and voltage measurements. Offering an ordinary SPI interface,
the AS8515 gives designers the freedom and flexibility to choose the MCU
they need for their application."
Price & Availability
The AS8515 integrated sensor interface is available for sampling now. It
is priced at $7.50 for 1,000 pieces.
A demonstration board for the AS8515 is available. For further
information on the AS8515 or to request samples, please visit www.ams.com/integrated-sensor-interface/AS8515.
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