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WMS7204100M Datasheet(PDF) 11 Page - Winbond

Part # WMS7204100M
Description  256-TAP NON-VOLATILE DIGITAL POTENTIOMETER
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
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WMS7204100M Datasheet(HTML) 11 Page - Winbond

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WMS7201
Publication Release Date: January 2003
- 11 -
Revision 1.1
TABLE 3 – A1 AND A0 ADDRESS BIT DECODE TABLE
[A1 A0]
[0 0]
[0 1]
[1 0]
[1 1]
Channel
0
1
2
3
A3 and A2 are the address bits that decide which NVMEM memory to be accessed, as shown in the
table below.
TABLE 4 – A3 AND A2 ADDRESS BIT DECODE TABLE
[A3 A2]
[0 0]
[0 1]
[1 0]
[1 1]
NVMEM
0
1
2
3
D7-D0 are the data values to be loaded into the Tap Register to set the wiper position, while D8 is
used to set the output mode. D8 has to be loaded into the NVMEM0~3 first and then the “Load Tap
Register” command (#6) has be executed to load D8 into the output-selection MUX to set the output
mode. D8=0 sets the output to Buffer Off mode while D8=1 sets to Buffer On mode.
FIGURE 5 – SPI COMMAND WAVEFORMS
CS
CS is taken LOW
before command
starts
CS is taken HIGH
after command is
sent
Note:
• A multiple of 24 bits must always be sent or the
command will not be valid
• Bits marked ‘x’ are don’t care bits.
C3
`
C2 C1 C0 A3 A2 A1 A0 x
x x x
x x
x D8 D7 D6 D5 D4 D3 D2 D1 D0
1 2 3 4 5 6 7 8 9 1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
CLK
SDI


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