MCP4351-103E/ST Microchip Technology, MCP4351-103E/ST Datasheet - Page 61

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MCP4351-103E/ST

Manufacturer Part Number
MCP4351-103E/ST
Description
IC DGTL POT QUAD 10K 20TSSOP
Manufacturer
Microchip Technology
Datasheet

Specifications of MCP4351-103E/ST

Taps
257
Resistance (ohms)
10K
Number Of Circuits
4
Temperature Coefficient
150 ppm/°C Typical
Memory Type
Volatile
Interface
SPI Serial
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP
Resistance In Ohms
10K
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
7.8
The Decrement command is an 8-bit command. The
Decrement command can only be issued to volatile
memory locations. The format of the command is
shown in
A Decrement command to the volatile memory location
changes that location after a properly formatted
command (8 clocks) have been received.
Decrement commands provide a quick and easy
method to modify the value of the volatile wiper location
by -1 with minimal overhead.
FIGURE 7-8:
SDI and SDO States.
 2010 Microchip Technology Inc.
SDI
SDO
Note:
Note 1: Only functions when writing the volatile
D
Decrement Wiper
A
1
1
Normal and High Voltage
3
2: Valid Address/Command combination.
3: Invalid Address/Command combination
4: If a Command Error (CMDERR) occurs
Figure
(DECR COMMAND (n+1))
Table 7-2
the Decrement Wiper command. Other
addresses are invalid.
D
A
1
1
wiper registers (AD3:AD0) 0h and 1h.
all following SDO bits will be low until the
CMDERR condition is cleared.
(the CS pin is forced to the inactive
state).
at this bit location (*), then all following
SDO bits will be driven low until the CS
pin is driven inactive (V
2
COMMAND BYTE
7-6.
A
D
1
1
1
A
D
0
1
1
shows the valid addresses for
Decrement Command –
1
1
1
0
1 1* 1 Note 1, 2
1
X
0
IH
X
0 Note 1, 3
).
7.8.1
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
waveforms for a single decrement. The decrement
operation requires that the CS pin be in the active state
(V
state (V
Then the 8-bit Decrement command (command byte) is
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 decrement from the wiper’s full
scale value (100h on 8-bit devices and 80h on 7-bit
devices). Above the wiper’s full scale value (8-bit =
101h to 1FFh, 7-bit = 81h to FFh), the Decrement com-
mand is disabled. If the wiper register has a zero scale
value (000h), then the wiper value will not decrement.
See
ment command vs. the current volatile wiper value.
The Decrement commands only require the Decrement
command byte, while the CS pin is active (V
for a single decrement.
After the wiper is decremented to the desired position,
the CS pin should be forced to V
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 decrement occurs.
TABLE 7-5:
Current Wiper
3FFh
081h
080h
07Fh
041h
040h
03Fh
001h
000h
IL
7-bit
Pot
or V
Table 7-5
Setting
IH
IHH
) and is driven to the active state (V
). Typically, the CS pin will be in the inactive
3FFh
101h
100h
0FFh
080h
07Fh
000h
8-bit
SINGLE DECREMENT
081
001
Pot
through
MCP433X/435X
for additional information on the Decre-
DECREMENT OPERATION VS.
VOLATILE WIPER VALUE
Reserved
(Full Scale (W = A))
Full Scale (W = A)
W = N
W = N (Mid-scale)
W = N
Zero Scale (W = B)
Properties
Figure 6-5
Wiper (W)
IH
DS22242A-page 61
show
to ensure that
Decrement
Command
Operates?
IL
IL
Yes
Yes
or V
possible
No
No
or V
IHH
IHH
IH
IH
),
).
)

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