AS8500-ASOT

AS8500-ASOT Datasheet

AS8500

Part	Datasheet
AS8500-ASOT	AS8500-ASOT (pdf)

Related Parts	Information
AS8500-ASOU	AS8500-ASOU

PDF Datasheet Preview
AS8500 2 Universal multi pupose data aquisition system Data Sheet DATA SHEET 1 Features 16 bits resolution differential inputs Single + 5V supply Low power 15 mW SOIC16 package 16 kHz maximum sampling frequency internal temperature measurement internal reference programmable current sources digital comparator active wake-up PGA gains 6, 24, 50, 100 Zero offset Zero offset TC Extremely low noise Internal oscillator with comparator for active wake up 3-wire serial interface, !P compatible temperature range 40 to + 125 °C ETR ETS VBAT RSHH RSHL AGND VDDA VSSA INTERNAL TEMPERATURE V REFERENCE INPUT MUX CHOPPER PROTECTION BUF 16 BIT - CONVERTER PGA and LEVEL SHIFT CALIBRATION DATA DSP CONTROLLER FILTER INT. CLOCK TIMER COMPARATOR CURRENT SOURCES SERIAL INTERFACE / CONTROL REGISTERS VDDD VSSD CLK EZPRG SCLK SDAT INTN Figure 1 Functional Block Diagram 2 Applications battery management for automotive systems power management mV/µ V-meter thermocouple temperature measurement RTD precision temperature measurement high-precision voltage and current measurement 3 General description The AS8500 is a complete, low power data acquisition system for very small signals i.e. voltages from shunt resistors, thermocouples that operates on a single 5 V power supply. The chip powers up with a set of default conditions at which time it can be operated as a read-only-converter. Reprogramming is at any time possible by just writing into two internal registers via the serial interface. The AS8500 has four ground refering inputs which can be switched separately to the internal PGA. Two input channels can also be operated as a fully differential ground free input. The system can measure both positive and negative input signals. The PGA amplification ranges from 6 to 100 which enables the system to measure signals from 7mV to 120 mV full scale range with high accuracy, linearity and speed. The chip contains a high precision bandgap reference and an active offset compensation that makes the system offset free better than 0,5 !V and the offset-TC value negligible. The builtin programmable digital filter allows an effective noise suppression if the high speed is not necessary in the application. The input noise density is only 35 nV / Hz and due to the high internal chopping frequency the system is free of 1/f-noise down to DC.The 0-10 Hz noise is typical below 1 µ V i.e. as good or better than any other available chopper amplifier. For high speed synchronous measurements the chip can run in an automatic switching mode between two input channels with preprogrammed parameter sets. The circuit has been optimised for the application in battery management systems in automotive systems. As a front end data acquisition system it allows an high quality measurement of current, voltage and temperature of the battery. With a high quality 100 !" resistor the system can handle the starter current of up to 1500 A, a continuous current of # 300 A as well as the very low idle current of a few mA in the standby mode. For external temperature measurement the chip can use a wide variety of different temperature sensors such as RTD, PTC, NTC, thermocouples or even diodes or transistors. A built-in programmable current source can be switched to any input and activate these sensors without the need of other external components. The measurement of the chip temperature with the integrated internal temperature sensor allows in addition the temperature compensation of sensitive parameters which increases the total accuracy considerably. The flexibility of the system is further increased by a digital comparator that can be assigned to any measured property current, voltage, temperature and an active wake-up in the sleep-mode. All analog input-terminals can be checked for wire break via the SDIinterface. Page 1 of 41 AS8500 - Data Sheet austriamicrosystems CONTENTS 1 FEATURES 1 13 ORDERING 39 14 40 HEADQUARTERS 40 SALES OFFICES 40 Page 2 of 41 AS8500 - Data Sheet austriamicrosystems 4 PIN function description for SOIC 16 package PIN Name RSHL anlalog input from shunt resistor low side Comment analog common for VBAT, ETS and ETR return for internal current source RSHH anlalog input from shunt resistor high side ETS analog input with reference to RSHL analog input for differential input ETS-VBAT analog output for current-source VBAT analog input with reference to RSHL analog input for differential input ETS-VBAT analog output for current-source VSS 0V-power supply for analog part EZPRG digital power input for programming Zener fuses. This input must be open or connected to VDDD. It is not intended, that OTP content is modified by the user. VSSD 0V-power supply and ground reference point for digital part external clock typical MHz during MWU-mode see external connection must be high impedance or connected to CLK digital input for external clock, master clock input VDDD to reduce current consumption SCLK serial port clock input for SDI-port the user must provide a serial clock on this input 10 SDAT serial data in- and output 11 INTN Digital I/O for interrupt from comparator signal wake-up to external µ C conversion ready flag for external interupt and synchronisation in normal mode 12 VDDD + 5V digital power supply 13 VDDA + 5V analog power supply 14 REF reference input/output 15 AGND analog ground, ground reference for ADC must be connected to VSS with a 30 nF capacitor this PIN must be connected with a 50-100nF-capacitor to VSS no direct connection to VSSD/VSS allowed 16 ETR analog input with reference to RSHL analog output for current-source Table 1 Pin Description Figure 2 Schematic Package outline SOIC 16 Page 3 of 41 12 Ordering Information Delivery Tape and Reel 1 reel = 1500 devices = MOQ Order AS8500 Page 39 of AS8500 - Data Sheet 13 Contact Headquarters austriamicrosystems AG A 8141 Schloss Premstätten, Austria Phone +43 3136 500 0 Fax +43 3136 525 01 Sales Offices austriamicrosystems Germany GmbH Tegernseer Landstrasse 85 D-81539 München, Germany Phone +49 89 69 36 43 0 Fax: +49 89 69 36 43 66 austriamicrosystems Italy S.r.l. Via A. Volta, 18 I-20094 Corsico MI , Italy Phone +39 02 4586 4364 Fax: +39 02 4585 773 austriamicrosystems France S.A.R.L. 124, Avenue de Paris F-94300 Vincennes, France Phone +33 1 43 74 00 90 Fax: +33 1 43 74 20 98 austriamicrosystems Switzerland AG Rietstrasse 4 CH 8640 Rapperswil, Switzerland Phone +41 55 220 9008 Fax: +41 55 220 9001 austriamicrosystems UK, Ltd. 88, Barkham Ride, Finchampstead, Wokingham Berkshire RG40 4ET, United Kingdom Phone +44 118 973 1797 Fax: +44 118 973 5117 austriamicrosystems AG Klaavuntie 9 G 55 FI 00910 Helsinki, Finland Phone +358 9 72688 170

PDF Datasheet Preview

AS8500
2 Universal multi pupose data aquisition system

Data Sheet

DATA SHEET
1 Features
16 bits resolution differential inputs Single + 5V supply Low power 15 mW SOIC16 package 16 kHz maximum sampling frequency internal temperature measurement internal reference programmable current sources digital comparator active wake-up PGA gains 6, 24, 50, 100 Zero offset Zero offset TC Extremely low noise Internal oscillator with comparator for active wake up 3-wire serial interface, !P compatible temperature range 40 to + 125 °C

ETR ETS VBAT RSHH

RSHL

AGND VDDA VSSA

INTERNAL TEMPERATURE

V REFERENCE

INPUT MUX CHOPPER PROTECTION

BUF 16 BIT - CONVERTER

PGA and LEVEL SHIFT

CALIBRATION DATA

DSP CONTROLLER

FILTER INT. CLOCK

TIMER

COMPARATOR

CURRENT SOURCES

SERIAL INTERFACE / CONTROL REGISTERS

VDDD VSSD

CLK EZPRG

SCLK

SDAT

INTN

Figure 1 Functional Block Diagram
2 Applications
battery management for automotive systems power management mV/µ V-meter thermocouple temperature measurement RTD precision temperature measurement high-precision voltage and current measurement
3 General description

The AS8500 is a complete, low power data acquisition system for very small signals i.e. voltages from shunt resistors, thermocouples that operates on a single 5 V power supply. The chip powers up with a set of default conditions at which time it can be operated as a read-only-converter. Reprogramming is at any time possible by just writing into two internal registers via the serial interface.

The AS8500 has four ground refering inputs which can be switched separately to the internal PGA. Two input channels can also be operated as a fully differential ground free input. The system can measure both positive and negative input signals.

The PGA amplification ranges from 6 to 100 which enables the system to measure signals from 7mV to 120 mV full scale range with high accuracy, linearity and speed. The chip contains a high precision bandgap reference and an active offset compensation that makes the system offset free better than 0,5 !V and the offset-TC value negligible. The builtin programmable digital filter allows an effective noise suppression if the high speed is not necessary in the application. The input noise density is only 35 nV / Hz and due to
the high internal chopping frequency the system is free of 1/f-noise down to DC.The 0-10 Hz noise is typical below 1 µ V i.e. as good or better than any other available chopper amplifier. For high speed synchronous measurements the chip can run in an automatic switching mode between two input channels with preprogrammed parameter sets. The circuit has been optimised for the application in battery management systems in automotive systems. As a front end data acquisition system it allows an high quality measurement of current, voltage and temperature of the battery.

With a high quality 100 !" resistor the system can handle the starter current of up to 1500 A, a continuous current of # 300 A as well as the very low idle current of a few mA in the standby mode. For external temperature measurement the chip can use a wide variety of different temperature sensors such as RTD, PTC, NTC, thermocouples or even diodes or transistors. A built-in programmable current source can be switched to any input and activate these sensors without the need of other external components. The measurement of the chip temperature with the integrated internal temperature sensor allows in addition the temperature compensation of sensitive parameters which increases the total accuracy considerably.

The flexibility of the system is further increased by a digital comparator that can be assigned to any measured property current, voltage, temperature and an active wake-up in the sleep-mode. All analog input-terminals can be checked for wire break via the SDIinterface.

Page 1 of 41

AS8500 - Data Sheet
austriamicrosystems

CONTENTS
1 FEATURES 1
13 ORDERING 39
14 40

HEADQUARTERS 40 SALES OFFICES 40

Page 2 of 41

AS8500 - Data Sheet
austriamicrosystems
4 PIN function description for SOIC 16 package

PIN Name

RSHL anlalog input from shunt resistor low side

Comment
analog common for VBAT, ETS and ETR return for internal current source

RSHH anlalog input from shunt resistor high side

ETS analog input with reference to RSHL
analog input for differential input ETS-VBAT
analog output for current-source

VBAT analog input with reference to RSHL
analog input for differential input ETS-VBAT
analog output for current-source

VSS 0V-power supply for analog part

EZPRG digital power input for programming Zener fuses.

This input must be open or connected to VDDD. It is not intended, that OTP content is modified by the user.

VSSD 0V-power supply and ground reference point for digital part
external clock typical MHz during MWU-mode see
external connection must be high impedance or connected to

CLK digital input for external clock, master clock input

VDDD to reduce current consumption

SCLK serial port clock input for SDI-port
the user must provide a serial clock on this input
10 SDAT serial data in- and output
11 INTN Digital I/O for interrupt from comparator
signal wake-up to external µ C
conversion ready flag for external interupt and synchronisation in normal mode
12 VDDD + 5V digital power supply
13 VDDA + 5V analog power supply
14 REF reference input/output 15 AGND analog ground, ground reference for ADC
must be connected to VSS with a 30 nF capacitor this PIN must be connected with a 50-100nF-capacitor to VSS no direct connection to VSSD/VSS allowed
16 ETR analog input with reference to RSHL
analog output for current-source

Table 1 Pin Description

Figure 2 Schematic Package outline SOIC 16

Page 3 of 41
12 Ordering Information Delivery Tape and Reel 1 reel = 1500 devices = MOQ Order AS8500

Page 39 of

AS8500 - Data Sheet
13 Contact

Headquarters austriamicrosystems AG A 8141 Schloss Premstätten, Austria Phone +43 3136 500 0 Fax +43 3136 525 01

Sales Offices
austriamicrosystems Germany GmbH

Tegernseer Landstrasse 85

D-81539 München, Germany

Phone +49 89 69 36 43 0

Fax:
+49 89 69 36 43 66
austriamicrosystems Italy S.r.l.

Via A. Volta, 18

I-20094 Corsico MI , Italy

Phone +39 02 4586 4364

Fax:
+39 02 4585 773
austriamicrosystems France S.A.R.L.
124, Avenue de Paris

F-94300 Vincennes, France

Phone +33 1 43 74 00 90

Fax:
+33 1 43 74 20 98
austriamicrosystems Switzerland AG

Rietstrasse 4

CH 8640 Rapperswil, Switzerland

Phone +41 55 220 9008

Fax:
+41 55 220 9001
austriamicrosystems UK, Ltd.
88, Barkham Ride,

Finchampstead, Wokingham

Berkshire RG40 4ET, United Kingdom

Phone +44 118 973 1797

Fax:
+44 118 973 5117
austriamicrosystems AG

Klaavuntie 9 G 55

FI 00910 Helsinki, Finland

Phone +358 9 72688 170

More datasheets: 74ABT16245CSSC | 74ABT16245CSSCX | 74ABT16245CMTDX | 74ABT16245CMTD | MSM0705 | MSM0712 | MSM0715 | MSM0724 | MSM0728 | 363VRD

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AS8500-ASOT Datasheet file may be downloaded here without warranties.

Datasheet ID: AS8500-ASOT 519775