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R8C 데이터시트(PDF) 121 Page - Renesas Technology Corp

부품명 R8C
상세설명  RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  199 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C 데이터시트(HTML) 121 Page - Renesas Technology Corp

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R8C/10 Group
Rev.1.20 Jan 27, 2006
page 111 of 180
REJ09B0019-0120
14.5 Internal Equivalent Circuit of Analog Input
14.5 Internal Equivalent Circuit of Analog Input
Figure 14.8 shows the internal equivalent circuit of analog input.
Figure 14.8 Internal Equivalent Circuit to Analog Input
VCC
VCC
VSS
i =10
VSS
SW2
SW1
AN0
ANi
VREF
Parasitic
diode
Parasitic
diode
ON resistor
approx. 2k
Ω Wiring resistor
approx. 0.2k
Ω
ON resistor
approx. 0.6k
Ω
ON resistor
approx. 0.6k
Ω
ON resistor
approx. 5k
Ω
Analog input voltage
VIN
SW1
ON resistor
approx. 2k
Ω Wiring resistor
approx. 0.2k
Ω
AVCC
AMP
SW3
Chopper-type
amplifier
A/D successive
conversion register
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.
Warning: Use only as a standard for designing this data.
Mass production may cause some changes in device characteristics.
SW4
AVSS
C = Approx.1.5pF
SW2
Vref
Comparison voltage
Sampling
control signal
Reference control
signal
Comparison reference voltage (Vref) generator
Sampling
Connect to
Connect to
Comparison
Resistor
ladder
AVSS
Control signal
for SW2
A/D control register 0
b1
b2
b0
Connect to
Connect to
Control signal
for SW3
i ladder-type
switches
(i = 10)
i ladder-type
wiring resistors
(i = 10)



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