参数资料
| 型号： | MCP402XEV |
| 厂商： | Microchip Technology |
| 文件页数： | 20/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MCP402X |
| 标准包装： | 1 |
| 主要目的： | 数字电位器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP4021 |
| 主要属性： | 1 个单路电位器，10 千欧，64 抽头，非易失 |
| 次要属性： | 2.7 ~ 5.5 V，150 ppm/°C |
| 已供物品： | 2 板，样品，CD |
| 产品目录页面： | 677 (CN2011-ZH PDF) |
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MCP401X/2X Evaluation Board User’s Guide
2.3.4
Wiper Voltages
when 5.0 volts is applied to the MCP402X Digital Potentiometer Evaluation Board
where the resistors R2 and R3 are 2500 Ω and the MCP4011 resistor value (R AB ) is
10 k Ω . Equation 2-4 shows the formula for these calculations.
EQUATION 2-4:
CALCULATING THE VOLTAGE ON THE MCP402X DIGITAL
( R3 + ( Wiper Position ? ( R AB ) ? 63 ) )
Voltage at Wiper = System V DD ? -----------------------------------------------------------------------------------------
POTENTIOMETER EVALUATION BOARD
R3 + R AB + R2
Where:
System V DD = 5.0V
R2 = 2.5 k Ω
R3 = 2.5 k Ω
R AB = 10 k Ω
The typical step resistance for the 10 k Ω MCP4021 is approximately 158.73 Ω . With a
5V supply and a 15 k Ω total resistance (2.5 k Ω + 2.5 k Ω + 10 k Ω ), the delta voltage per
step is approximately 0.053V.
TABLE 2-3:
WIPER POSITION AND CORRESPONDING VOLTAGE
Wiper
Wiper
Wiper
Wiper
Position
00 (1)
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Voltage
(V)
0.833
0.866
0.939
0.992
1.045
1.098
1.151
1.204
1.257
1.310
1.362
1.415
1.468
1.521
1.574
1.627
Position
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Voltage
(V)
1.680
1.733
1.786
1.839
1.892
1.944
1.997
2.050
2.103
2.156
2.209
2.262
2.315
2.368
2.421
2.474
Position
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Voltage
(V)
2.526
2.579
2.632
2.685
2.738
2.791
2.844
2.897
2.950
3.003
3.056
3.108
3.161
3.214
3.267
3.320
Position
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63 (2)
Voltage
(V)
3.373
3.426
3.479
3.532
3.585
3.638
3.690
3.743
3.796
3.849
3.902
3.955
4.008
4.061
4.114
4.167
DS51546B-page 16
Note 1:
2:
This is zero-scale, wiper is connected to terminal B.
This is full-scale, wiper is connected to terminal A.
? 2005 Microchip Technology Inc.
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