MCP41100-IP 查看數據表（PDF） - Microchip Technology

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MCP41100-IP

Single/Dual Digital Potentiometer with SPI™ Interface

Microchip Technology 

MCP41XXX/42XXX

Microcontroller

CS

SCK

SO

CS

SCK

SI

SO

Device 1

EXAMPLE:

If you want to load the following

command/data into each part

in the chain.

Device 1

XX10XX11 11001100

c

Start by setting CS low and

clocking in the command and

data that will end up in Device

3 (16 clocks).

Device 1

XX10XX00 10101010

CS

SCK

SI

SO

Device 2

CS

SCK

SI

Device 3*

Device 2

XX01XX10 11110000

Device 2

00000000 00000000

Device 3

XX10XX00 10101010

After 16 clocks, Device 2 and

Device 3 will both have all

zeros clocked in from the

previous part’s shift register.

Device 3

00000000 00000000

d

Clock-In the command and

data for Device 2 (16 more

clocks). The data that was pre-

viously loaded gets shifted to

the next device on the chain.

e

Clock-In the data for Device 1

(16 more clocks). The data that

was previously loaded into

Device 1 gets shifted into

Device 2 and Device 3 contains

the first byte loaded. Raise the

CS line to execute the com-

mands for all 3 devices at the

same time.

Device 1

XX01XX10 11110000

Device 2

XX10XX00 10101010

After 32 clocks, Device 2 has

the data previously loaded

into Device 1 and Device 3

gets 16 more zeros.

Device 3

00000000 00000000

Device 1

XX10XX11 11001100

Device 2

XX01XX10 11110000

After 48 clocks, all 3 devices

have the proper command/

data loaded into their shift

registers.

Device 3

XX10XX00 10101010

* Last device on a daisy-chain may be a single channel MCP41XXX device.

FIGURE 5-4:

Daisy-Chain Configuration.

DS11195C-page 20

 2003 Microchip Technology Inc.

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