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| 型号： | EVAL-AD7280AEDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 39/48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 1: Initialize All Parts in a Daisy Chain on Initial
Power-Up and When Coming Out of Power-Down
Example 1 shows a typical device initialization routine.
Example 2: Convert and Read All Parts, All Voltages,
and All Auxiliary ADC Inputs
In this example, it is assumed that all AD7280As in the daisy
1.
To initialize all device addresses, set Bit D2 and Bit D0
chain have been initialized to their correct device addresses.
of the control register to 1, and set Bit D1 of the control
register to 0 on all parts in the chain. The 32-bit write
command is 0x01C2B6E2 (see Table 23, Write 1).
1.
Write Register Address 0x00 to the read register on all
parts. A device address of 0x00 is used when computing
the CRC for commands to write to all parts. The 32-bit
2.
Write the register address corresponding to the lower byte
write command is 0x38011CA (see Table 24, Write 1).
3.
of the control register to the read register on all parts. The
32-bit write command is 0x038716CA (see Table 23, Write 2).
Apply a CS low pulse that frames 32 SCLKs for each device
in the chain to be read back. All conversion readbacks
should simultaneously write the 32-bit command
0xF800030A, as described in the Serial Interface section
(see Table 23 , Write 3). This read is used to verify that all
2.
Note that 0x00 is the default value of the read register on
power-up and after a software reset; therefore, this write
operation may not be necessary.
Set Bits[D15:D12] of the control register to 0 on all parts.
Write 2).
AD7280As in the chain have received and locked their
unique device addresses. Confirm that all device addresses
are in sequence.
3.
4.
5.
Note that this is the default value of Bits[D15:D12] of the
control register on power-up and after a software reset;
therefore, this write operation may not be necessary.
Program the CNVST control register to 0x02 on all parts
to allow conversions to be initiated using the CNVST pin.
Write 3).
Initiate conversions through the falling edge of CNVST.
Allow sufficient time for all conversions to be completed
plus t WAIT . Following the completion of all conversions,
apply a CS low pulse that frames 32 SCLKs for each conver-
sion result to be read back. The 32-bit write command is
0xF800030A, as described in the Serial Interface section
(see Table 24 , Write 4).
Table 23. Example 1: Initializing All AD7280A Devices in a Daisy Chain
32-Bit Write
Write Command
Write 1
Write 2
Write 3
Device Address
00000
00000
11111
Register Address
001110
011100
000000
Data
00010101
00111000
00000000
Write All
1
1
0
D11
0
0
0
8-Bit CRC
11011100
11011001
01100001
D2 to D0
010
010
010
Command
0x01C2B6E2
0x038716CA
0xF800030A
Table 24. Example 2: Converting and Reading All Voltages and All Auxiliary ADC Inputs from All AD7280A Devices
32-Bit Write
Write Command
Write 1
Write 2
Write 3
Write 4
Device Address
00000
00000
00000
11111
Register Address
011100
001101
011101
000000
Data
00000000
00000000
00000010
00000000
Write All
1
1
1
0
D11
0
0
0
0
8-Bit CRC
00111001
01100011
10000101
01100001
D2 to D0
010
010
010
010
Command
0x038011CA
0x01A0131A
0x03A0546A
0xF800030A
Rev. 0 | Page 39 of 48
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