When the device powers up (rising V
參數(shù)資料
型號(hào): MCP4012T-202E/CH
廠商: Microchip Technology
文件頁(yè)數(shù): 21/54頁(yè)
文件大?。?/td> 0K
描述: IC DGTL POT 2.1K 1CH RHE SOT23-6
標(biāo)準(zhǔn)包裝: 1
接片: 64
電阻(歐姆): 2.1k
電路數(shù): 1
溫度系數(shù): 標(biāo)準(zhǔn)值 150 ppm/°C
存儲(chǔ)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: SOT-23-6
供應(yīng)商設(shè)備封裝: SOT-23-6
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 674 (CN2011-ZH PDF)
其它名稱: MCP4012T-202E/CHDKR
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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