参数资料
| 型号： | AD7280AWBSTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/48页 |
| 文件大小： | 0K |
| 描述： | IC BATT MON LI-ION AUTO 48LQFP |
| 标准包装： | 1 |
| 功能： | 电池监控器，过压/欠压保护 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 8 V ~ 30 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
AD7280A
REFERENCE
The internal reference is temperature compensated to 2.5 V. The
reference is trimmed to provide a typical drift of ±3 ppm/°C. As
shown in Figure 30, the internal reference circuitry consists of a
1.2 V band gap reference and a reference buffer. The 2.5 V refer-
ence is available at the V REF pin. The V REF pin should be decoupled
to REFGND using a 1 μF or greater ceramic capacitor. The C REF
pin should be decoupled to REFGND using a 0.1 μF or greater
ceramic capacitor. The 2.5 V reference is capable of driving an
external load of up to 10 kΩ.
The conversion sequence—that is, the order in which the cell
voltages and auxiliary ADC inputs are converted—is shown in
reverse order, that is, Cell 6 is followed by Cell 5, and so on.
However, the auxiliary ADC inputs are converted in increasing
numerical order, that is, AUX1 is followed by AUX2, and so on.
For example, when all 12 inputs are selected for conversion, the
conversion of Cell 1, that is, VIN1 to VIN0, is followed by the
conversion of the AUX1 input.
When all selected conversions are completed, the VIN6 and VIN5
voltage inputs are again selected through the multiplexer, and
REFGND
C REF
AV CC
BAND GAP
1.2V
V REF
ADC SELF-TEST
VOLTAGE
the voltage across Cell 6 is acquired in preparation for the next
conversion request. This is the default state for the multiplexer.
Bits[D15:D14] of the control register select the cell voltage and
auxiliary ADC inputs to be converted. There are four options
Figure 30. AD7280A Internal Reference
CONVERTING CELL VOLTAGES AND AUXILIARY
available (see Table 8).
Table 8. Cell Voltage and Auxiliary ADC Input Selection
ADC INPUTS
A conversion can be initiated on the AD7280A using either the
CNVST input or the serial interface (see the Conversion Start
Format section). A single conversion command initiates conver-
sions on all selected channels of the AD7280A. As described in
Bits[D15:D14]
00
01
10
11
Voltage Inputs
6 to 1
6 to 1
6 to 1
ADC self-test
Auxiliary ADC Inputs
1 to 6
1, 3, and 5
None
None
the Converter Operation section, the voltage of each individual
battery cell is measured by converting the difference between
adjacent analog inputs. The first cell to be converted following a
convert start command is Cell 6, which is the difference between
VIN6 and VIN5. At the end of the first conversion, the AD7280A
generates an internal end-of-conversion (EOC) signal. This internal
EOC selects the next cell voltage inputs for measurement through
the multiplexer, that is, the difference between VIN5 and VIN4.
The new input is acquired, and a second internal convert start
signal is generated, which initiates the conversion. This process
is repeated until all the selected voltage and auxiliary ADC inputs
have been converted.
t 1
CNVST
t CONV
t ACQ
Each voltage and auxiliary ADC input conversion requires a
minimum of 1 μs to acquire and convert the cell voltage or
auxiliary ADC input voltage. For example, when Bits[D15:D14]
are set to 00, the falling edge of CNVST triggers a series of 12
conversions. This requires a minimum of 12 μs to convert all
selected measurements on a single AD7280A. If no auxiliary
ADC input conversions are required, Bits[D15:D14] are set to
10. In this case, the conversion request triggers a series of six
conversions, requiring a minimum of 6 μs.
t CONV
INTERNAL ADC
CONVERSIONS
VOLT 6
VOLT 5
VOLT 4
AUX6
Figure 31. ADC Conversions on the AD7280A
CONVERSION WINDOW
t 1
CNVST
t WAIT
t QUIET
INTERNAL ADC
CONVERSIONS
SERIAL READ
OPERATION
VOLT VOLT VOLT
6 5 4
AUX6
DATA READBACK — ALL DEVICES
VOLT VOLT
6 5
Figure 32. ADC Conversions and Readback on the AD7280A
Rev. 0 | Page 19 of 48
相关PDF资料 |
PDF描述 |
|---|---|
| AD780CR | IC VREF SERIES SHUNT PREC 8-SOIC |
| AD8280WASTZ-RL | IC LI-ION BATT MON 48LQFP |
| AD8383ACPZ | IC DECIMATING LCD DRIVER 48LFCSP |
| AD8384ASVZ | IC DRIVER LCD 6CH 10BIT 80-TQFP |
| AD8511ARUZ-REEL | IC MUX LCD DVR 11CH 3.3V 48TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7280AWBSTZ-RL | 功能描述:IC BATT MON LI-ION AUTO 48LQFP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| AD7280BSTZ | 制造商:Analog Devices 功能描述: |
| AD7280BSTZ-RL | 制造商:Analog Devices 功能描述: |
| AD7280BSTZ-U6 | 制造商:Analog Devices 功能描述: |
| AD7280S-OB | 制造商:Sony Nec Optiarc America 功能描述:24X DVDRW SATA (BLACK) - Bulk |
发布紧急采购，3分钟左右您将得到回复。