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| 型号： | EVAL-AD7280AEDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/48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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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
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| EVAL-AD7298SDZ | 制造商:Analog Devices 功能描述:EVAL BOARD, AD7192 12BIT ADC |
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