Renesas M16C/64A Series User Manual page 663

M16C/64A Group
External circuit example
Open-circuit
ANi: ANi (i = 0 to 7), ANEXi, AN0-i, AN2-i
AINRST0: Bit in the AINRST register
Figure 27.6 A/D Open-Circuit Detection Example on AVCC (Preconversion Charge)
Measuring Condition (common)
VCC1 = 5.12 V
Analog input pin is AN0
R = 100 kΩ
The horizontal axis indicates how many times A/D conversion
C = 100 pF between AN0 and GND
For example, 20kHz indicates
XIN = 10 MHz
The horizontal axis shows how many times A/D conversion is performed per ms.
For example, 20 kHz indicates A/D conversion is performed every 50 μs.
Figure 27.7 A/D Open-Circuit Detection (Charge) Characteristics (Standard Characteristics)
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
R
Analog input
ANi
C
Charge
AINRST0 = 1
27. A/D Converter
On
Charge
control signal
Off
Discharge
control signal
Sampling
capacitor
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