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R8C/15 Datasheet(PDF) 189 Page - Renesas Technology Corp

Part # R8C/15
Description  16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / R8C/Tiny SERIES
PDF  277 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C/15 Datasheet(HTML) 189 Page - Renesas Technology Corp

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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
b1
b2
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
Ω Wiring Resistor
Approx. 0.2k
Ω
ON Resistor
Approx. 0.6k
Ω
ON Resistor
Approx. 2k
Ω Wiring Resistor
Approx. 0.2k
Ω
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
Ω
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 Comparison
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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