AS8510_10 datasheet(2/47 Pages) AMSCO

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AS8510

Data Acquisition Device for Battery Sensors

www.ams.com/AS8510

Revision 3.5

1 - 46

1 General Description

The AS8510 is a virtually offset free, low noise, two channel

measurement device. It is tailored to accurately measure battery

current from mA range up to kA range in conjunction with a 100 µ

shunt resistor in series with the battery rail. Through the second

measurement channel it enables capture of, either battery voltage

synchronous with the current measurement, or, measure the analog

output of an internal or external temperature sensor. Both channels

are matched and can either measure small signals up to ±160 mV

versus ground, through programmable gain amplifier or larger

signals in the 0 to 1V range without the amplifier.

After analog to digital conversion and digital filtering, the resulting

16-bit digital words are accessible through 4-wire standard serial

interface.The device includes a number of additional features

explained in the next section.

2 Key Features



3.3V supply voltage



Two High resolution 16 bit

Σ−Δ A/D converters



Programmable sampling to enable data throughputs from less

than 1Hz to 8kHz



Zero Offset for both channels



Independent control of data rate on both channels



Precision, low noise, programmable gain amplifiers for both

channels with gains 5, 25, 40, 100 to support wide dynamic

ranges.



Option for multiplexing either one differential

input, or two single ended inputs or the internal temperature

sensor on one channel



Programmable current source for external temperature sensor

connectable to any of the inputs



High precision and high stability 1.2V reference voltage source



Digital signal processing with filter options for both channels



Four operating modes providing

- Continuous data acquisition (or)

- Periodic single-shot acquisition, (or)

- Continuous acquisition on threshold crossing of programmed

current levels (or)

- A combination of the above



On chip high-precision 4MHz RC oscillator or option for external

clock



-40ºC to +125ºC ambient operation



AEC - Q100 automotive qualified



Internal chip ID for full traceability



SSOP-20 pin package

3 Applications

The AS8510 is ideal for shunt based batteries sensor. For high-side

current sensing, the input signal may be conditioned using ams

device AS8525 before applying to this device.

VBAT_IN

DVDD

SDO

SDI

SCLK CS

AVDD

INT

CLK

DVSS

RSHH

RSHL

ETR

VCM

ETS

CHOP_CLK

MEN

VBAT_GND

Internal Temperature Sensor

PGA

16-bit Sigma-Delta ADC

Serial Interface

Oscillators

FIR / MA

Analog Common Mode

Chopper

MUX and

Chopper

Bandgap Reference

AVSS

REF

AS8510

Prog-Cur

Source

Figure 1. AS8510 Block Diagram

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