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Re: mcp42100一問...
#2
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The digitalPot is a sheet-resistor which is built of diffused p-silicon layer(PAx, PBx) and the internal switches (PWx, which contains some hundred Ohms of resistance when it is on and high impedence when it is off). So, digitalPot is a variable resistor that is right. When we try to measuring resistance between PAx-PBx, PAx-PWx and PBx-PWx of MCP42100 we need to
- Applied +2.7V to +5.5V to VDD
- VSS to ground
- /RS to VDD
- keep PAx, PBx and PWx open, no connection with any
node of the circuit

Now we can measuring resistance between PAx-PBx, PAx-PWx and PBx-PWx by the multimeter.

Please be noted that the maximum voltage which can be applied to PAx, PBx or PWx should not over the VDD, for example, VDD=3.3V, make sure that the voltage applied to PAx, PBx or PWx equal to or less than 3.3V otherwise may damage the digitalPot.

發表於: 2004/8/26 11:55
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mcp42100一問...
#1
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我想請問一下
mcp42100算是可變電阻嗎?
我目前可以用pic控制mcp42100輸出的電壓
不過我量輸出端的電阻值卻都量不到...

PA1:5V PB0:0V 資料設定128
PW0實際得到電壓值2.5V沒錯
但是用電錶量PB0與PW0間的阻值卻量不出來

如此說來的話這應該算是數位分壓器
而不是數位可變電阻囉?!
那為何又有分10K,50K,100K呢?
可承受的功率不同嗎?

有辦法可以量得其輸出電阻值嗎?
我想試試數位控制的RC震盪頻率
謝謝

發表於: 2004/8/24 17:34
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