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COP8AME9EMW8 参数 Datasheet PDF下载

COP8AME9EMW8图片预览
型号: COP8AME9EMW8
PDF下载: 下载PDF文件 查看货源
内容描述: 8位CMOS闪存微控制器,具有8K内存,双通道运算放大器,虚拟EEROM ,温度传感器, 10位A / D和掉电复位 [8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEROM, Temperature Sensor,10-Bit A/D and Brownout Reset]
分类和应用: 闪存传感器温度传感器微控制器和处理器外围集成电路运算放大器光电二极管时钟
文件页数/大小: 83 页 / 908 K
品牌: NSC [ National Semiconductor ]
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15.0 A/D Converter (Continued)  
TABLE 22. A/D Converter Channel Selection when the Multiplexor Output is Disabled  
Mode Select  
ADMOD = 0  
Single Ended  
Mode  
Mode Select  
ADMOD = 1  
Differential  
Mode  
Mux Output  
Disabled  
Select Bits  
ADCH3  
ADCH2  
ADCH1  
ADCH0  
Channel No.  
Channel Pairs  
(+, −)  
MUX  
0
1
1
1
Temp sensor, if  
Not used  
0
enabled  
10  
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
10, 11 (Note 12)  
11, 10 (Note 12)  
12, 13 (Note 12)  
13, 12 (Note 12)  
14, 15 (Note 12)  
15, 14 (Note 12)  
0
0
0
0
0
0
11  
12  
13  
14  
15  
Note 12: Only if the programmable gain amplifier is bypassed.  
15.1.1.2 Multiplexor Output Select  
3. Select the same desired channel and operating modes  
used in step 1 and load them into ENAD and also set  
ADBSY. This will start the conversion.  
The MUX bit field allows the output of the A/D multiplexor  
(with the exception of the temperature sensor channel) and  
the input to the A/D to be connected directly to external pins.  
This allows for an external, common filter/signal conditioning  
circuit to be applied to all channels. The output of the exter-  
nal conditioning circuit can then be connected directly to the  
input of the Sample and Hold input on the A/D Converter.  
See Figure 26 for the single ended mode diagram. The  
Multiplexor output is connected to ADCH4 and the A/D input  
is connected to ADCH5. For differential mode, the differential  
multiplexor outputs are available and should be converted to  
a single ended voltage for connection to the A/D Converter  
Input. The programmable gain amplifier must be bypassed  
when using the multiplexor output feature in differential  
mode. See Figure 27.  
4. After conversion is completed, obtain the results from  
the result registers.  
20006356  
The channel assignments for this mode are shown in Table  
23.  
FIGURE 26. A/D with Single Ended Mux Output Feature  
Enabled  
When using the Mux Output feature, the delay though the  
internal multiplexor to the pin, plus the delay of the external  
filter circuit, plus the internal delay to the Sample and Hold  
will exceed the three clock cycles that’s allowed in the con-  
version. This requires that whenever the MUX bit = 1, that  
the channel selected by ADCH3:0 bits, be enabled, even  
when ADBSY = 0, and gated to the mux output pin. The input  
path to the A/D converter should also be enabled. This  
allows the input channel to be selected and settled before  
starting a conversion. The sequence to perform conversions  
using the Mux Out feature is a multistep process and is listed  
below.  
1. Select the desired channel, excluding the temperature  
sensor channel, and operating modes and load them  
into ENAD without setting ADBSY.  
20006357  
FIGURE 27. A/D with Differential Mux Output Feature  
Enabled  
2. Wait the appropriate time until the analog input has  
settled. This will depend on the application and the  
response of the external circuit.  
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