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参数资料
| 型号： | EVAL-AD7280AEDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 42/48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
Example 5: Read a Single Configuration Register
on All Parts
In this example, it is assumed that all AD7280As in the daisy
chain have been initialized to their correct device addresses.
Example 6: Read a Single Configuration Register
from One Part
In this example, it is assumed that all AD7280As in the daisy
chain have been initialized to their correct device addresses.
1.
2.
3.
Set Bit D0 of the control register to 1 on all parts. This write
enables the daisy-chain register read operation on all parts.
Write 1).
The register address corresponding to the configuration
register to be read should be written to the read register on
all parts (see Table 13 for register addresses). In this example,
the cell balance register is read from all parts. The 32-bit
write command is 0x038A12B2 (see Table 27, Write 2).
Apply a CS low pulse that frames 32 SCLKs for each device
in the stack to read back the desired register contents from
all parts. This frame should simultaneously write the 32-bit
section (see Table 27 , Write 3).
1.
2.
3.
4.
Set Bits[D13:D12] of the control register to 1 on all parts.
This setting turns off the read operation on all parts. The
32-bit write command is 0x01A6151A (see Table 28, Write 1).
Set Bits[D13:D12] of the control register of the part to be
read from to 0. In this example, Device 1 in the stack is to
be read from. The 32-bit write command is 0x81A00222
(see Table 28, Write 2).
The register address corresponding to the configuration
register to be read should be written to the read register of
the part that is to be read (see Table 13 for register
addresses). This example reads the alert register from
Device 1 in the stack. The 32-bit write command is
0x8389800A (see Table 28, Write 3).
Apply a CS low pulse that frames 32 SCLKs to read back
the desired register contents. This frame should simultan-
eously write the 32-bit command 0xF800030A, as
Write 4). When reading from a single device in a stack of
AD7280As, the SCLK frequency must be lower than
1 MHz to read back the register data from parts higher in
the chain than the master device.
Table 27. Example 5: Reading a Single Configuration Register from All AD7280A Devices
32-Bit Write
Write Command
Write 1
Write 2
Write 3
Device Address
00000
00000
11111
Register Address
001110
011100
000000
Data
00010101
01010000
00000000
Write All
1
1
0
D11
0
0
0
8-Bit CRC
11011100
01010110
01100001
D2 to D0
010
010
010
Command
0x01C2B6E2
0x038A12B2
0xF800030A
Table 28. Example 6: Reading a Single Configuration Register from One AD7280A Device
32-Bit Write
Write Command
Write 1
Write 2
Write 3
Write 4
Device Address
00000
10000
10000
11111
Register Address
001101
001101
011100
000000
Data
00110000
00000000
01001100
00000000
Write All
1
0
0
0
D11
0
0
0
0
8-Bit CRC
10100011
01000100
00000001
01100001
D2 to D0
010
010
010
010
Command
0x01A6151A
0x81A00222
0x8389800A
0xF800030A
Rev. 0 | Page 42 of 48
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