AD5162EVAL Analog Devices Inc, AD5162EVAL Datasheet - Page 16

• Manufacturer Part Number: AD5162EVAL
• Description: BOARD EVAL FOR AD5162
• Manufacturer: Analog Devices Inc

Specifications of AD5162EVAL

• Main Purpose: Digital Potentiometer
• Utilized Ic / Part: AD5162
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

AD5162
SPI INTERFACE
SPI-COMPATIBLE, 3-WIRE SERIAL BUS
The AD5162 contains a 3-wire, SPI-compatible digital interface
(SDI, CS , and CLK). The 9-bit serial word must be loaded MSB
first. The format of the word is shown in Table 8.
The positive-edge sensitive CLK input requires clean transitions
to avoid clocking incorrect data into the serial input register.
Standard logic families work well. If mechanical switches are
used for product evaluation, they should be debounced by a
flip-flop or another suitable means. When CS is low, the clock
loads data into the serial register on each positive clock edge
(see Figure 42).
The data setup and data hold times in Table 3 determine the
valid timing requirements. The AD5162 uses a 9-bit serial input
data register word that is transferred to the internal RDAC
register when the CS line returns to logic high. Extra MSB bits
are ignored.
(DATA IN)
V
CLK
OUT
SDI
CS
V
DD
1
0
1
0
1
0
0
Figure 43. SPI Interface Detailed Timing Diagram (V
t
CSH0
t
CSS
Dx
t
CH
Rev. C | Page 16 of 20
t
DS
Dx
t
CL
Table 8. Serial Data-Word Format
MSB
B8
A0
(2
1
The values of bits are shown in parentheses.
V
8
CLK
OUT
SDI
)
CS
t
CH
1
0
1
0
1
0
1
0
A
= 5 V, V
B7
D7
(2
t
CSH1
7
)
B
= 0 V, V
A0
Figure 42. SPI Interface Timing Diagram
B6
D6
t
CS1
D7
(V
W
t
S
t
= V
A
CSW
D6
= 5 V, V
B5
D5
OUT
)
D5
B
RDAC REGISTER LOAD
B4
D4
= 0 V, V
±1LSB
D4
D3
1
W
B3
D3
= V
D2
OUT
)
D1
B2
D2
D0
B1
D1
LSB
B0
D0
(2
0
)