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| 型号： | EVAL-AD7280AEDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/48页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7280 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池监控器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | * |
| 主要属性： | * |
| 次要属性： | SPI 接口 |
| 已供物品： | 板 |
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Lithium Ion Battery Monitoring System
AD7280A
FEATURES
12-bit ADC, 1 μs per channel conversion time
6 analog input channels, common-mode
range 0.5 V to 27.5 V
FUNCTIONAL BLOCK DIAGRAM
V DD
6 auxiliary ADC inputs
±1.6 mV cell voltage accuracy
On-chip voltage regulator
Cell balancing interface
Daisy-chain interface
Internal reference: ±3 ppm/ o C
1.8 μA power-down current
High input impedance
Serial interface with alert function
1 SPI interface for up to 48 channels
VIN6
VIN5
VIN4
VIN3
VIN2
VIN1
VIN0
AUX6
AUX5
AUX4
AUX3
AUX2
AUX1
HV
MUX
LV
MUX
DAISY-CHAIN
INTERFACE
AD7280A
CLOCK
CELL
BALANCING
INTERFACE
REGULATOR
12-BIT ADC
CONTROL LOGIC
AND SELF-TEST
V REG
DGND
DV CC
AV CC
V DRIVE
CRC protection on read and write commands
SCLK
On-chip registers for channel sequencing
V DD operating range: 8 V to 30 V
Temperature range: ?40°C to +105°C
48-lead LQFP
AUX TERM
V REF
C REF
REFGND
2.5V
REF
LIMIT REG
SQN LOGIC
DATA MEMORY
SPI INTERFACE
SDI
SDO
ALERT
CS
PD
CNVST
Qualified for automotive applications
MASTER
APPLICATIONS
Lithium ion battery monitoring
V SS
AGND
Figure 1.
SDOlo ALERTlo
Electric and hybrid electric vehicles
Power supply backup
Power tools
GENERAL DESCRIPTION
The AD7280A 1 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 V DD 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
V DD 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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
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.
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