MCP42050-I/TS Microchip Technology, MCP42050-I/TS Datasheet - Page 20

• Manufacturer Part Number: MCP42050-I/TS
• Description: Single/Dual Digital Potentiometer with SPI Interface
• Manufacturer: Microchip Technology

MCP41XXX/42XXX
FIGURE 5-4:
DS11195C-page 20
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.
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.
Start by setting CS low and
clocking in the command and
data that will end up in Device
3 (16 clocks).
If you want to load the following
command/data into each part
in the chain.
Microcontroller
EXAMPLE:
Daisy-Chain Configuration.
CS
SCK
SO
XX10XX11
XX10XX00
XX01XX10
XX10XX11
Device 1
Device 1
Device 1
Device 1
* Last device on a daisy-chain may be a single channel MCP41XXX device.
CS
SCK
SI
Device 1
11001100
10101010
11110000
11001100
SO
XX01XX10
00000000
XX10XX00
XX01XX10
CS
SCK
SI
Device 2
Device 2
Device 2
Device 2
Device 2
11110000
00000000
10101010
11110000
SO
XX10XX00
00000000
00000000
XX10XX00
2003 Microchip Technology Inc.
CS
SCK
SI
After 32 clocks, Device 2 has
the data previously loaded
into Device 1 and Device 3
gets 16 more zeros.
After 48 clocks, all 3 devices
have the proper command/
data loaded into their shift
registers.
After 16 clocks, Device 2 and
Device 3 will both have all
zeros clocked in from the
previous part’s shift register.
Device 3*
Device 3
Device 3
Device 3
Device 3
10101010
00000000
00000000
10101010