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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
Page 61
62
Page 62
63
Page 63
64
Page 64
65
Page 65
66
Page 66
67
Page 67
68
Page 68
69
Page 69
70
Page 70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
Page 61/88

Download datasheet (6Mb)Embed
PrevNext
7.8
Decrement Wiper
Normal and High Voltage
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
Figure
7-6.
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.
COMMAND BYTE
(DECR COMMAND (n+1))
A
A
A
A
1
0
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 7-8:
Decrement Command –
SDI and SDO States.
Note:
Table 7-2
shows the valid addresses for
the Decrement Wiper command. Other
addresses are invalid.
 2010 Microchip Technology Inc.
7.8.1
SINGLE DECREMENT
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
or V
). Typically, the CS pin will be in the inactive
IL
IHH
state (V
) and is driven to the active state (V
IH
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
Table 7-5
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
Setting
).
7-bit
8-bit
Pot
Pot
3FFh
3FFh
081h
101h
080h
100h
07Fh
0FFh
041h
081
040h
080h
03Fh
07Fh
001h
001
000h
000h
MCP433X/435X
IH
through
Figure 6-5
show
possible
or V
IL
IHH
for additional information on the Decre-
or V
IL
IHH
to ensure that
IH
DECREMENT OPERATION VS.
VOLATILE WIPER VALUE
Decrement
Wiper (W)
Command
Properties
Operates?
Reserved
No
(Full Scale (W = A))
Full Scale (W = A)
Yes
W = N
W = N (Mid-scale)
Yes
W = N
Zero Scale (W = B)
No
DS22242A-page 61
),
).
)
IH