tmp86fh46bng TOSHIBA Semiconductor CORPORATION, tmp86fh46bng Datasheet - Page 155

• Manufacturer Part Number: tmp86fh46bng
• Description: 8 Bit Microcontroller Tlcs-870/c Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

12.6
12.6.1
12.6.2
12.6.3
Figure 12-5 Analog Input Equivalent Circuit and Example of Input Pin Processing
Precautions about AD Converter
age outside this range is applied to one of the analog input pins, the converted value on that pin becomes uncer-
tain. The other analog input pins also are affected by that.
puts 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 oth-
er pins may also be affected by noise arising from input/output to and from adjacent pins.
dance of the analog input source, more easily they are susceptible to noise. Therefore, make sure the output im-
pedance of the signal source in your design is 5 kΩ or less. Toshiba also recommends attaching a capacitor ex-
ternal to the chip.
Make sure the analog input pins (AIN0 to AIN7) are used at voltages within VAREF to AVSS. If any volt-
The analog input pins (AIN0 to AIN7) are shared with input/output ports. When using any of the analog in-
The internal equivalent circuit of the analog input pins is shown in Figure 12-5. The higher the output impe-
Permissible signal
source impedance
5 k (max)
Analog input pin voltage range
Analog input shared pins
Noise Countermeasure
Note) i = 7 to 0
AINi
Internal resistance
Internal capacitance
5 k (typ)
Page 137
C = 12 pF (typ.)
Analog comparator
DA converter
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