Renesas R8C/Tiny Series Instrukcja Obsługi Pobierz pdf (Strona 121)

R8C/10 Group

Rev.1.20 Jan 27, 2006 page 111 of 180

REJ09B0019-0120

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

i =10

SW2

SW1

AN0

ANi

REF

Parasitic

diode

Parasitic

diode

ON resistor

approx. 2kΩ

Wiring resistor

approx. 0.2k

Ω

ON resistor

approx. 0.6kΩ

ON resistor

approx. 0.6kΩ

ON resistor

approx. 5kΩ

Analog input voltage

SW1

ON resistor

approx. 2kΩ

Wiring resistor

approx. 0.2k

Ω

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

C = Approx.1.5pF

SW2

Vref

Comparison voltage

Sampling

control signal

Reference control

signal

Comparison reference voltage (Vref) generator

Sampling

Connect to

Comparison

Resistor

ladder

Control signal

for SW2

A/D control register 0

b2 b0

Connect to

Control signal

for SW3

i ladder-type

switches

(i = 10)

i ladder-type

wiring resistors

(i = 10)

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 198 199

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Renesas R8C/Tiny Series Instrukcja Obsługi Strona 121

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