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| 型號： | MCP4011T-503E/SN |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 21/54頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 50K 1CH 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 3,300 |
| 接片： | 64 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 150 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | 2 線串行（芯片選擇，增/減） |
| 電源電壓： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 帶卷 (TR) |
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MCP4011/2/3/4
DS21978C-page 28
2006 Microchip Technology Inc.
4.2
Power-up
When the device powers up (rising VDD crosses the
Trip Point Voltage (VTP)), the “default” wiper setting is
restored. Table 4-1 shows the default value loaded into
the wiper on POR/BOR.
TABLE 4-1:
DEFAULT POR WIPER
SETTING SELECTION
While VDD < Vmin (1.8V), the electrical performance
may not meet the data sheet specifications (see
Figure 4-2). The wiper state may be unknown. Also, the
device may be capable of incrementing or decrement-
ing, if a valid command is detected on the CS and U/D
pins.
4.3
Brown Out
If the device VDD is below the specified minimum
voltage, care must be taken to ensure that the CS and
U/D pins do not “create” any of the serial commands.
When the device VDD drops below VMIN (1.8V), the
electrical performance may not meet the data sheet
specifications (see Figure 4-2). The wiper state may be
unknown. Also, the device may be capable of
incrementing or decrementing, if a valid command is
detected on the CS and U/D pins.
When the device voltage rises from below the power-
up trip point (VTP) into the valid operation voltage
range, the wiper state will be forced to the default POR
wiper setting (see Table 4-1).
4.4
Serial Interface Inactive
The serial interface is inactive any time the CS pin is at
VIH and all write cycles are completed.
FIGURE 4-2:
Power-up and Brown-out.
Package
Code
Default
POR
Wiper
Setting
Wiper
Code
Typical
RAB Value
-202
Mid-scale
1Fh
2.1 k
Ω
-502
Mid-scale
1Fh
5.0 k
Ω
-103
Mid-scale
1Fh
10.0 k
Ω
-503
Mid-scale
1Fh
50.0 k
Ω
VTP
VSS
VDD
1.8V
POR Trip Point (on Rising VDD)
Outside Device Operation
Wiper Forced to Default POR Setting
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