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AD7280AWBSTZ 数据表(PDF) 1 Page - Analog Devices |
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AD7280AWBSTZ 数据表(HTML) 1 Page - Analog Devices |
1 / 48 page Lithium Ion Battery Monitoring System AD7280A Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved. FEATURES 12-bit ADC, 1 μs per channel conversion time 6 analog input channels, common-mode range 0.5 V to 27.5 V 6 auxiliary ADC inputs ±1.6 mV cell voltage accuracy On-chip voltage regulator Cell balancing interface Daisy-chain interface Internal reference: ±3 ppm/oC 1.8 μA power-down current High input impedance Serial interface with alert function 1 SPI interface for up to 48 channels CRC protection on read and write commands On-chip registers for channel sequencing VDD operating range: 8 V to 30 V Temperature range: −40°C to +105°C 48-lead LQFP Qualified for automotive applications APPLICATIONS Lithium ion battery monitoring Electric and hybrid electric vehicles Power supply backup Power tools FUNCTIONAL BLOCK DIAGRAM CLOCK 2.5V REF REGULATOR CELL BALANCING INTERFACE DAISY-CHAIN INTERFACE AD7280A 12-BIT ADC VDD VREG DGND DVCC VSS AGND SDOlo ALERTlo AVCC VDRIVE SCLK SDI SDO ALERT CS PD CNVST MASTER REFGND CREF VREF AUXTERM LV MUX AUX6 AUX5 AUX4 AUX3 AUX2 AUX1 HV MUX VIN6 VIN5 VIN4 VIN3 VIN2 VIN1 VIN0 LIMIT REG SQN LOGIC DATA MEMORY SPI INTERFACE CONTROL LOGIC AND SELF-TEST Figure 1. GENERAL DESCRIPTION The AD7280A1 contains all the functions required for general- purpose monitoring of stacked lithium ion batteries as used in hybrid electric vehicles, battery backup applications, and power tools. The part has multiplexed cell voltage and auxiliary ADC measurement channels for up to six cells of battery management. An internal ±3 ppm/°C reference is provided that allows a cell voltage accuracy of ±1.6 mV. The ADC resolution is 12 bits and allows conversion of up to 48 cells within 7 μs. The AD7280A operates from a single VDD supply that has a range of 8 V to 30 V (with an absolute maximum rating of 33 V). The part provides six differential analog input channels to accommodate large common-mode signals across the full VDD range. Each channel allows an input signal range, VIN(+) − VIN(−), of 1 V to 5 V. The input pins assume a series stack of six cells. In addition, the part includes six auxiliary ADC input channels that can be used for temperature measurement or system diagnostics. The AD7280A includes on-chip registers that allow a sequence of channel measurements to be programmed to suit the application requirements. The AD7280A also includes a dynamic alert function that can detect whether the cell voltages or auxiliary ADC inputs exceed an upper or lower limit defined by the user. The AD7280A has cell balancing interface outputs designed to control external FET transistors to allow discharging of individual cells. The AD7280A includes a built-in self-test feature that internally applies a known voltage to the ADC inputs. A daisy-chain interface allows up to eight parts to be stacked without the need for individual device isolation. The AD7280A requires only one supply pin that accepts 6.9 mA under normal operation while converting at 1 MSPS. All this functionality is provided in a 48-lead LQFP package operating over a temperature range of −40°C to +105°C. 1 Patents pending. |
类似零件编号 - AD7280AWBSTZ |
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类似说明 - AD7280AWBSTZ |
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