M16CSLASH62 datasheet(426/621 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

411

2.7.14 Internal Equivalent Circuit of Analog Input

Figure 2.7.28 shows the internal equivalent circuit of analog input.

Figure 2.7.28. Internal equivalent circuit to analog input

ON resistor

approx. 2k

A-D successive conversion

Analog input voltage

AVcc

AVss

Chopper-type

amplifier

ADT/A-D conversion

interrupt request

Vcc

Vss

VIN

A-D control register 0

Comparison voltage

Comparison reference voltage (Vref) generator

VREF

AVss

Vref

b2 b1 b0

Vcc

Vss

AN i

Wiring resistor

approx. 0.2k

ON resistor

approx. 0.6k

SW2

Sampling

control signal

SW1

C = Approx. 3.0pF

SW3

SW4

AMP

ON resistor,

approx. 5k

SW2

Reference control

signal

Resistor

ladder

Control signal

for SW2

Control signal

for SW3

Connect to

Comparison

Connect to

Sampling

i ladder-type

switches

i ladder-type wiring

resistors

ON resistor

approx. 0.6k

AN0

Parasitic

diode

SW1

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.

Parasitic

diode

Warning: Use only as a standard for designing this data.

Mass production may cause some changes in device characteristics.

(i = 10)

Ω

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