使用哪一顆PIC, 有沒有程式傳過來試試看。
taiwan.techhelp@microchip.com

各位好，我在使用mplab燒錄完後，要reset時出現了
error performing requested operation
這個訊息，而且起始位置跑到了1EFF去了，沒有從0000
開始，但軟体模擬是可以的，○SC有試過HS, RC
不知道出了什麼問題

Microchip有將PICmicro的燒錄規格放在網站上，如果你有興趣可以下載來試試。
http://www.microchip.com/stellent/idc ... e=SS_GET_PAGE&nodeId=1407

會將16F84燒壞，不知你有沒有量過 MCLR的電壓是否超過13.2V?

Any A/D has the offset that is the nature of the A/D and the offset is independent of the amplitude of the input signal, we have many customers using MCP3201 in their applications and never get this kind of problem, please check the other portion of the circuit in your application, for example, maybe you have OP Amp as an amplifier or buffer in front of A/D, sometimes the offset is caused by OP Amp, Microchip have many good OP Amp which you can choose for your applications.

I am using a MCP3201 A/D IC for my analog input convertion. I am using a 5V supply and a 2.55V refrerence.

I found a problem with my convertion result. The result of the A/D convertion have an offset,
and the offset become bigger according to the input voltage when it become bigger.

Ex. for a 1V input the result will go approx. 1.01 V and the result will reach 2.55V if the input is about 2.50V.
Can you please tell me how to solve the offset problem?

我也曾燒死幾顆
最後找到原因是電路焊接不良
地線不穩
重焊後就OK

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.

凡事起頭難，歡迎來上 Microchip 的 Workshop，可以參考 W100 , W400 & W201 的課程。點選右邊的"教育訓練"

MCP23016 Applications:

- General purpose I/O expansion for I2C/SMBus applications (like driving ACPI power switches, sensors, push-buttons, keypads, LEDs & fans etc.)
- Power supply applications
- PCs, cell phones, Home Appliance and industrial applications
- Board version tracking and configuration
- Board health monitoring and status reporting
- Multi-card systems in telecom, networking, and base station infrastructure equipment
- Field recall and troubleshooting functions for installed boards

MCP1252/53 is a regulated charge pump that can be used for white LED drive in parallel, the drive capability can be up to 120mA. The control of the brightness of LED can be done through a control signal which applied to /SHDN pin. Only need a small capacitance external capacitor and no inductor is required, so it is very easy to use with no EMI issues.

For drive LED in series, we have MCP1650 boost controller, the voltage output of MCP1650 can up to 100V with 5W power output, so it is easy to drive many LEDs is series, datasheet of MCP1650 been put in Microchip's website, you can get it from website or contact Microchip Taiwan office.