MCP4351-103E/ST

Manufacturer Part NumberMCP4351-103E/ST
DescriptionIC DGTL POT QUAD 10K 20TSSOP
ManufacturerMicrochip Technology
MCP4351-103E/ST datasheet
 


Specifications of MCP4351-103E/ST

Taps257Resistance (ohms)10K
Number Of Circuits4Temperature Coefficient150 ppm/°C Typical
Memory TypeVolatileInterfaceSPI Serial
Voltage - Supply1.8 V ~ 5.5 VOperating Temperature-40°C ~ 125°C
Mounting TypeSurface MountPackage / Case20-TSSOP
Resistance In Ohms10KLead Free Status / RoHS StatusLead free / RoHS Compliant
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Page 59/88

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7.7
Increment Wiper
Normal and High Voltage
The Increment command is an 8-bit command. The
Increment command can only be issued to volatile
memory locations. The format of the command is
shown in
Figure
7-6.
An Increment command to the volatile memory location
changes that location after a properly formatted com-
mand (8-clocks) have been received.
Increment commands provide a quick and easy
method to modify the value of the volatile wiper location
by +1 with minimal overhead.
COMMAND BYTE
(INCR COMMAND (n+1))
A
A
A
A
0
1
X
X
SDI
D
D
D
D
3
2
1
0
1 1* 1 Note 1, 2
1
1
1
1
1
SDO
0 Note 1, 3
1
1
1
1
1
1
0
Note 1: Only functions when writing the volatile
wiper registers (AD3:AD0) 0h and 1h.
2: Valid Address/Command combination.
3: Invalid Address/Command combination
all following SDO bits will be low until the
CMDERR condition is cleared. (the CS
pin is forced to the inactive state).
4: If a Command Error (CMDERR) occurs
at this bit location (*), then all following
SDO bits will be driven low until the CS
pin is driven inactive (V
).
IH
FIGURE 7-6:
Increment Command –
SDI and SDO States.
Note:
Table 7-2
shows the valid addresses for
the Increment Wiper command. Other
addresses are invalid.
 2010 Microchip Technology Inc.
MCP433X/435X
7.7.1
SINGLE INCREMENT
Typically, the CS pin starts at the inactive state (V
but may already be in the active state due to the
completion of another command.
Figure 6-4
through
Figure 6-5
show
waveforms for a single increment. The increment
operation requires that the CS pin be in the active state
(V
or V
). Typically, the CS pin will be in the inactive
IL
IHH
state (V
) and is driven to the active state (V
IH
The 8-bit Increment command (command byte) is then
clocked in on the SDI pin by the SCK pins. The SDO pin
drives the CMDERR bit on the 7th clock.
The wiper value will increment up to 100h on 8-bit
devices and 80h on 7-bit devices. After the wiper value
has reached full scale (8-bit = 100h, 7-bit = 80h), the
wiper value will not be incremented further. If the wiper
register has a value between 101h and 1FFh, the
Increment command is disabled. See
additional information on the Increment command
versus the current volatile wiper value.
The increment operations only require the Increment
command byte while the CS pin is active (V
for a single increment.
After the wiper is incremented to the desired position,
the CS pin should be forced to V
IH
unexpected transitions on the SCK pin do not cause
the wiper setting to change. Driving the CS pin to V
should occur as soon as possible (within device
specifications) after the last desired increment occurs.
TABLE 7-4:
INCREMENT OPERATION VS.
VOLATILE WIPER VALUE
Current Wiper
Setting
Wiper (W)
Properties
7-bit
8-bit
Pot
Pot
3FFh
3FFh
Reserved
081h
101h
(Full Scale (W = A))
080h
100h
Full Scale (W = A)
07Fh
0FFh
W = N
041h
081
040h
080h
W = N (Mid-scale)
03Fh
07Fh
W = N
001h
001
000h
000h
Zero Scale (W = B)
DS22242A-page 59
),
IH
possible
or V
).
IL
IHH
Table 7-4
for
or V
)
IL
IHH
to ensure that
IH
Increment
Command
Operates?
No
No
Yes
Yes