WMS7201010S WINBOND [Winbond], WMS7201010S Datasheet - Page 12
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WMS7201010S
Manufacturer Part Number
WMS7201010S
Description
256-TAP NON-VOLATILE DIGITAL POTENTIOMETER
Manufacturer
WINBOND [Winbond]
Datasheet
1.WMS7201010S.pdf
(29 pages)
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Note: C3-C0 are the command op-code; A3, A2 are the NVMEM address; A1, A0 are the channel address.
This chapter describes the sequences of commands to send to the WMS7201 and how to use the
different features.
Inst
No.
7.7. I
7.8. B
1. Take the chip out of SLEEP mode.
2. Check that the write protect is set correctly if writing to NVMEM (10-pin TSSOP package
3. Pull the CS pin LOW before sending data to the device.
0 0 0 0 x x x x
1 1 0 0 x x A1 A0
0 1 0 0 x x A1 A0
1 0 1 0 A3 A2 A1 A0
0 0 1 0 A3 A2 A1 A0
1 0 1 1 A3 A2 A1 A0
0 0 1 1 A3 A2 A1 A0
0 1 1 1 x x A1 A0
1 1 1 1 x x A1 A0
1 0 0 0 x x x x
0 0 0 1 x x x x
1 1 0 1 A3 A2 A1 A0
1 0 0 1 x x x x
C3 C2 C1 C0 A3 A2 A1
7.8.1 Sending a Command
only).
NSTRUCTION
ASIC
Instruction Byte
A0
O
PERATION
S
ET
D8
D15 D14 D13 D12 D11 D10 D9 D8
x
x
x
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TABLE 5 – INSTRUCTION SET
Data Byte 1
x
x
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- 12 -
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x
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
Data Byte 2
No Operation (NOP). Do nothing
Read Tap Register and output
selection MUX register
Write to Tap Register with D7-D0
Read NVMEM pointed to by A3-A0
Program NVMEM pointed to by
A3-A0 with D8-D0
Load Tap Register and output
selection MUX register with the
contents of NVMEM pointed to by
A3-A0
Program NVMEM pointed to by
A3-A0 with the contents of Tap
Register and output selection MUX
register
Up: Increment setting of TR by one
tap
Down: Decrement setting of TR by
one tap
Sleep: Discontinue clock supply to
the logic and memories
Wake Up: Clock supply to the logic
and memories
Byte-erase NVMEM pointed to by
A3-A0
Power On Reset: Software reset
the part to the power up state
WMS7201
Operation