CAT5172 Datasheet, PDF (5/10 Pages) ON Semiconductor – 256-Position SPI Compatible Digital Potentiometer

SPI Interface
CAT5172
Table 6. CAT5172 SERIAL DATA−WORD FORMAT
B7 B6 B5 B4 B3 B2 B1 B0
D7 D6 D5 D4 D3 D2 D1 D0
MSB
LSB
2⁷
2⁰
CS
CLK
SDI
V1
V_OUT
V2
1 234 5 678
DATA IN
D7 D6 D5 D4 D3 D2 D1 D0
Figure 2. CAT5172 SPI Interface Timing Diagram (V_A = 5 V, V_B = 0 V, V_W = V_OUT)
1
SDI
(DATA IN) ₀
1
CLK
0
t_CSHO
1
CS
0
V_W
VOUT
V_W0
Dx
t_CH
Dx
t_DS
t_CL
t_CSS
t_DH
t_CS1
t_CSH1
t_CSW
t_S
±1 LSB
Figure 3. SPI Interface Detailed Timing Diagram (V_A = 5 V, V_B = 0 V, V_W = V_OUT)
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