Renesas R8C/15 Informacje Techniczne Strona 191

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R8C/14 Group, R8C/15 Group 16. A/D Converter
Rev.2.10 Jan 19, 2006 Page 177 of 253
REJ09B0164-0210
16.5 Internal Equivalent Circuit of Analog Input
Figure 16.8 shows the Internal Equivalent Circuit of Analog Input.
Figure 16.8 Internal Equivalent Circuit of Analog Input
VCC
Parasitic Diode
Chopper-type
Amplifier
A/D Successive
Conversion Register
Comparison
voltage
b1b2 b0
VCC VSS
AN8
VSS
i=4
AN11
VREF
AVSS
Vref
Comparison reference voltage
(Vref) generator
SW1
SW2
AVCC
AMP
SW3
AVSS
VIN
SW4
SW2
SW1
Parasitic Diode
ON Resistor
Approx. 2k
Wiring Resistor
Approx. 0.2k
ON Resistor
Approx. 0.6k
ON Resistor
Approx. 2k
Wiring Resistor
Approx. 0.2k
i Ladder-type
Switches
A/D Control Register 0
ON Resistor
Approx. 0.6k f
Analog Input
Voltage
Sampling
Control Signal
ON Resistor
Approx. 5k
C = Approx.1.5pF
A/D Conversion
Interrupt Request
SW1 conducts only on the ports selected for analog input.
SW2 and SW3 are open when A/D conversion is not in progress;
their status varies as shown by the waveforms in the diagrams on the left.
SW4 conducts only when A/D conversion is not in progress.
Control signal
for SW2
Control signal
for SW3
Sampling
Compari son
Connect to
Connect to
Connect to
Connect to
NOTES:
1. Use only as a standard for designing this data.
Mass production may cause some changes in device characteristics.
i Ladder-type
Wiring Resistors
Resistor
ladder
Reference
Control Signal
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