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参数资料
| 型号： | EVAL-AD5270SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5270 |
| 标准包装： | 1 |
| 主要目的： | 数字电位器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD5270 |
| 主要属性： | 1 通道，1024 位置 |
| 次要属性： | 2.7 ~ 5.5 V，5 ppm/°C，SPI 接口 |
| 已供物品： | 电路板，CD，器件，稳压器 |
Data Sheet
AD5270/AD5271
Rev. F | Page 19 of 24
RDAC AND 50-TP READ OPERATION
A serial data output SDO pin is available for readback of the
internal RDAC register or 50-TP memory contents. The
contents of the RDAC register can be read back through SDO
by using Command 2 (see Table 11). Data from the RDAC
register is clocked out of the SDO pin during the last 10 clocks
of the next SPI operation.
It is possible to read back the contents of any of the 50-TP
memory registers through SDO by using Command 5. The
lower six LSB bits, D0 to D5 of the data byte, select which
memory location is to be read back, as shown in Table 13.
Data from the selected memory location is clocked out of the
SDO pin during the next SPI operation. A binary encoded
version address of the most recently programmed wiper memory
location can be read back using Command 6 (see Table 11). This
can be used to monitor the spare memory status of the 50-TP
memory block.
Table 12 provides a sample listing for the sequence of serial data
input (DIN) words with the serial data output appearing at the
SDO pin in hexadecimal format for a write and read to both the
RDAC register and the 50-TP memory (Memory Location 20).
Table 11. Command Operation Truth Table
Command
Number
Command[DB13:DB10]
Data[DB9:DB0]1
Operation
C3
C2
C1
C0
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
X
NOP: do nothing.
1
0
1
D9
D8
D7
D6
D5
D4
D3
D2
Write contents of serial register
data to RDAC.
2
0
1
0
X
Read contents of RDAC wiper
register.
3
0
1
X
Store wiper setting: store RDAC
setting to 50-TP.
4
0
1
0
X
Software reset: refresh RDAC with
last 50-TP memory stored value.
0
1
0
1
X
D5
D4
D3
D2
D1
D0
Read contents of 50-TP from SDO
output in the next frame.
6
0
1
0
X
Read address of last 50-TP
programmed memory location.
0
1
X
D2
D1
D0
Write contents of serial register
data to control register.
8
1
0
X
Read contents of control register.
9
1
0
1
X
D0
Software shutdown.
D0 = 0; normal mode.
D0 = 1; device placed in shutdown
mode.
1
X is don’t care.
2
AD5271 = don’t care.
3
See Table 15 for 50-TP memory map.
4
See Table 14 for bit details.
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