tmp86c809ng TOSHIBA Semiconductor CORPORATION, tmp86c809ng Datasheet - Page 139
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tmp86c809ng
Manufacturer Part Number
tmp86c809ng
Description
8 Bit Microcontroller Tlcs-870/c Series
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP86C809NG.pdf
(154 pages)
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12.6 Precautions about AD Converter
12.6.1 Analog input pin voltage range
12.6.2 Analog input shared pins
12.6.3 Noise Countermeasure
Figure 12-5
Permissible signal
source impedance
5 kΩ (max)
outside this range is applied to one of the analog input pins, the converted value on that pin becomes uncertain.
The other analog input pins also are affected by that.
inputs to execute AD conversion, do not execute input/output instructions for all other ports. This is necessary
to prevent the accuracy of AD conversion from degrading. Not only these analog input shared pins, some other
pins may also be affected by noise arising from input/output to and from adjacent pins.
impedance of the analog input source, more easily they are susceptible to noise. Therefore, make sure the out-
put impedance of the signal source in your design is 5 kΩ or less. Toshiba also recommends attaching a capac-
itor external to the chip.
Make sure the analog input pins (AIN0 to AIN5) are used at voltages within VDD to VSS. If any voltage
The analog input pins (AIN0 to AIN5) are shared with input/output ports. When using any of the analog
The internal equivalent circuit of the analog input pins is shown in Figure 12-5. The higher the output
Note) i = 5 to 0
Analog Input Equivalent Circuit and Example of Input Pin Processing
AINi
Internal resistance
5 kΩ (typ)
Internal capacitance
Page 129
C = 12 pF (typ.)
Analog comparator
DA converter
TMP86C809NG
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