MCP4131 MICROCHIP [Microchip Technology], MCP4131 Datasheet - Page 51

• Manufacturer Part Number: MCP4131
• Description: 7/8-Bit Single/Dual SPI Digital POT with Volatile Memory
• Manufacturer: MICROCHIP [Microchip Technology]

7.5
The Write command is a 16-bit command. The format
of the command is shown in
A Write command to a Volatile memory location
changes that location after a properly formatted Write
Command (16-clock) have been received.
FIGURE 7-2:
© 2008 Microchip Technology Inc.
SDI
SDO
Note:
Note 1: If an Error Condition occurs (CMDERR = L), all following SDO bits will be low until the CMDERR
D
A
3
1
1
Write Data
Normal and High Voltage
The High Voltage Write Data command is
supported for compatability with system
that also support MCP414X/416X/424X/
426X devices.
D
A
2
1
1
COMMAND BYTE
condition is cleared (the CS pin is forced to the inactive state).
A
D
1
1
1
A
D
0
1
1
Write Command - SDI and SDO States.
0
1
1
0
1
1
Figure
D
1
0
9
7-2.
D
8
1
0
D
7
1
0
D
6
1
0
D
5
1
0
DATA BYTE
MCP413X/415X/423X/425X
D
4
1
0
D
3
1
0
D
2
1
0
7.5.1
The write operation requires that the CS pin be in the
active state (V
the inactive state (V
(V
Data Byte) is then clocked in on the SCK and SDI pins.
Once all 16 bits have been received, the specified
volatile address is updated. A write will not occur if the
write command isn’t exactly 16 clocks pulses. This
protects against system issues from corrupting the
memory locations.
Figure 6-3
for a single write.
D
1
1
0
IL
). The 16-bit Write Command (Command Byte and
D
0
1 Valid Address/Command combination
0 Invalid Address/Command combination
and
SINGLE WRITE
IL
or V
Figure 6-4
IHH
IH
) and is driven to the active state
). Typically, the CS pin will be in
show possible waveforms
DS22060B-page 51
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