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MFRC530 MFRC530发烫的问题.
问
俺用MFRC530做MIFARE ONE 读卡器,图基本上是PHILIPS的DEMO.在上电后RC530温度急剧上升(并不损坏),并对其它电路有一定程度干扰.需要刷一次卡,温度就开始恢复正常,电路工作趋于稳定.上述现象在俺的另几个产品调试中没有发现.
有没有哪位同行遇到过类似现象?
您是如何排除的?
望不吝剔教.
俺的程序大概如下:
uchar M500PcdConfig(void)
{
uchar status;
Dog();
if ((status = M500PcdReset()) == MI_OK)
{
WriteIO(RegClockQControl,0x0);
WriteIO(RegClockQControl,0x40);
delay50us(2);
ClearBitMask(RegClockQControl,0x40);
WriteIO(RegBitPhase,0xAD);
WriteIO(RegRxThreshold,0xFF);
WriteIO(RegRxControl2,0x41);
WriteIO(RegFIFOLevel,0x04);
WriteIO(RegTimerControl,0x02);
WriteIO(RegTxControl,0x58);
WriteIO(RegBitPhase,0xad);
WriteIO(RegMfOutSelect,0x00);
M500PcdSetTmo(7);
WriteIO(RegIRqPinConfig,0x03);
M500PcdRfReset(100);
}
return (status);
}
void main(void)
{
....
M500PcdConfig();
....
WriteIO(RegRxControl2,0x41);//激活天线
WriteIO(RegTxControl,0x58);
if(M500PICcCommonRequest()==MI_OK)
{
....
}
else
{
....
}
WriteIO(RegRxControl2,0x40);//停掉天线
WriteIO(RegTxControl,0x10);
......
}
答 1: :(没人理俺啊.55555555555 答 2: 天线不好,震荡不稳且不匹配
有没有哪位同行遇到过类似现象?
您是如何排除的?
望不吝剔教.
俺的程序大概如下:
uchar M500PcdConfig(void)
{
uchar status;
Dog();
if ((status = M500PcdReset()) == MI_OK)
{
WriteIO(RegClockQControl,0x0);
WriteIO(RegClockQControl,0x40);
delay50us(2);
ClearBitMask(RegClockQControl,0x40);
WriteIO(RegBitPhase,0xAD);
WriteIO(RegRxThreshold,0xFF);
WriteIO(RegRxControl2,0x41);
WriteIO(RegFIFOLevel,0x04);
WriteIO(RegTimerControl,0x02);
WriteIO(RegTxControl,0x58);
WriteIO(RegBitPhase,0xad);
WriteIO(RegMfOutSelect,0x00);
M500PcdSetTmo(7);
WriteIO(RegIRqPinConfig,0x03);
M500PcdRfReset(100);
}
return (status);
}
void main(void)
{
....
M500PcdConfig();
....
WriteIO(RegRxControl2,0x41);//激活天线
WriteIO(RegTxControl,0x58);
if(M500PICcCommonRequest()==MI_OK)
{
....
}
else
{
....
}
WriteIO(RegRxControl2,0x40);//停掉天线
WriteIO(RegTxControl,0x10);
......
}
答 1: :(没人理俺啊.55555555555 答 2: 天线不好,震荡不稳且不匹配
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