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R28 Datasheet(PDF) 356 Page - Renesas Technology Corp

Part # R28
Description  RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES
PDF  473 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R28 Datasheet(HTML) 356 Page - Renesas Technology Corp

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R8C/28 Group, R8C/29 Group
18. A/D Converter
Rev.2.10
Sep 26, 2008
Page 337 of 441
REJ09B0279-0210
18.5
Internal Equivalent Circuit of Analog Input
Figure 18.10 shows the Internal Equivalent Circuit of Analog Input.
Figure 18.10
Internal Equivalent Circuit of Analog Input
VCC
Parasitic Diode
Chopper-type
Amplifier
A/D Successive
Conversion Register
Comparison
voltage
b1
b2
b0
VCC VSS
AN0
VSS
i = 4
AN11
VREF
AVSS
Vref
Comparison reference voltage
(Vref) generator
SW1
SW2
AVCC
AMP
SW3
AVSS
VIN
SW4
SW5
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.
SW5 conducts when compare operation is in progress.
Control signal
for SW2
Control signal
for SW3
Sampling Comparison
Connect to
Connect to
Connect to
Connect to
NOTE:
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
b4



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