tmp86c408idmg TOSHIBA Semiconductor CORPORATION, tmp86c408idmg Datasheet - Page 137
tmp86c408idmg
Manufacturer Part Number
tmp86c408idmg
Description
Cmos 8-bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP86C408IDMG.pdf
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12.4 Precautions about AD Converter
12.4.1 Analog input pin voltage range
12.4.2 Analog input shared pins
12.4.3 Noise countermeasure
Figure 12-4 Analog Input Equivalent Circuit and Example of Input Pin Processing
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.
ance of the analog input source, more easily they are susceptible to noise. Therefore, make sure the output
impedance of the signal source in your design is 5 kΩ or less. Toshiba also recommends attaching a capacitor
external to the chip.
Make sure the analog input pins (AIN0 to AIN5) are used at voltages within VSS below VDD. 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 12-4. The higher the output imped-
Allowable signal
source impedance
Note) i = 5~0
5 kΩ (max)
AINx
Internal resistance
5 kΩ (typ)
Internal capacitance
Page 127
C = 22 pF (typ.)
Analog comparator
DA converter
TMP86C408IDMG
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