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WMS7204100T Datasheet(PDF) 9 Page - Winbond

Part # WMS7204100T
Description  256-TAP NON-VOLATILE DIGITAL POTENTIOMETER
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
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WMS7204100T Datasheet(HTML) 9 Page - Winbond

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WMS7201
Publication Release Date: January 2003
- 9 -
Revision 1.1
7.5. DAISY CHAIN
Multiple devices can be controlled by the same bus without the need for extra CS lines from the
microcontroller by daisy chaining the devices with the SDO of the first device connected to SDI of the
next device as shown in figure 3 when using the 10-pin package.
FIGURE 3 – DAISY CHAIN CONFIGURATION [10-PIN TSSOP PACKAGE ONLY]
A complete command is 24 bits including the instruction and the two data bytes. When shifting 24 bits
in to the first device in the chain, the 24 bits of the previous command will be shifted out. So to set up
two devices in a daisy chain, a total of 48 bits must be sent where the first 24 bits will be shifted out to
the second device and the 24 bits shifted in last will remain in the first device.
FIGURE 4 – DAISY CHAIN COMMAND EXAMPLE
CS
CLK
SDO
SDI SDO
SDI SDO
SDI SDO
Device
Device
Device
Micro
controller
CS
CS
CLK
CLK
CLK
CS
1. Command and data for device 2 is shifted into device 1, this will propagate to Device 2 when
the next 24 bits are shifted in.
Command 1
Data
2
Data
2
xx
xx
xx
Device
Device
2. Command and data for device 1 is shifted into device 1. Now Device 1 and 2 are correctly set
up. 10-pin TSSOP package only.
Command 2
Data
1
Data
1
Command 1
Data
2
Data
2
Device
Device
VDD


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