EVAL-AD5270SDZ Analog Devices Inc, EVAL-AD5270SDZ Datasheet - Page 19

• Manufacturer Part Number: EVAL-AD5270SDZ
• Description: EVALUATION BOARD
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD5270SDZ

• Main Purpose: Digital Potentiometer
• Embedded: No
• Utilized Ic / Part: AD5270
• Primary Attributes: 1 Channel, 1024 Position
• Secondary Attributes: 2.7 ~ 5.5 V, 5 ppm/°C, SPI Interfaces
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Command
Number
0
1
2
3
4
5
6
7
8
9
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.
Table 11. Command Operation Truth Table
1
2
3
4
X is don’t care.
AD5271 = don’t care.
See Table 15 for 50-TP memory map.
See Table 14 for bit details.
3
4
Command[DB13:DB10]
C3
0
0
0
0
0
0
0
0
1
1
C2
0
0
0
0
1
1
1
1
0
0
C1
0
0
1
1
0
0
1
1
0
0
C0
0
1
0
1
0
1
0
1
0
1
D9
X
D9
X
X
X
X
X
X
X
X
D8
X
D8
X
X
X
X
X
X
X
X
D7
X
D7
X
X
X
X
X
X
X
X
D6
X
D6
X
X
X
X
X
X
X
X
Rev. E | Page 19 of 24
Data[DB9:DB0]
D5
X
D5
X
X
X
D5
X
X
X
X
D4
X
D4
X
X
X
D4
X
X
X
X
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).
D3
X
D3
X
X
X
X
X
X
X
D3
1
D2
X
D2
X
X
X
X
D2
X
X
D2
D1
X
D1
X
X
X
X
D1
X
X
D1
2
D0
X
D0
X
X
X
X
D0
X
D0
D0
2
Operation
NOP: do nothing.
Write contents of serial register
data to RDAC.
Read contents of RDAC wiper
register.
Store wiper setting: store RDAC
setting to 50-TP.
Software reset: refresh RDAC with
last 50-TP memory stored value.
Read contents of 50-TP from SDO
output in the next frame.
Read address of last 50-TP
programmed memory location.
Write contents of serial register
data to control register.
Read contents of control register.
Software shutdown.
D0 = 0; normal mode.
D0 = 1; device placed in shutdown
mode.
AD5270/AD5271