4501 Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC

Número de pieza

componentes Descripción

Fabricante

4501

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4501 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

A-D CONVERTER

The 4501 Group has a built-in A-D conversion circuit that performs

conversion by 10-bit successive comparison method. Table 11

shows the characteristics of this A-D converter. This A-D converter

can also be used as an 8-bit comparator to compare analog volt-

ages input from the analog input pin with preset values.

Table 11 A-D converter characteristics

Parameter

Characteristics

Conversion format Successive comparison method

Resolution

10 bits

Relative accuracy Linearity error: ±2LSB

Non-linearity error: ±0.9LSB

Conversion speed 46.5 µs (High-speed mode at 4.0 MHz

oscillation frequency)

Analog input pin

2

IAP2

(P20, P21)

OP2A

(P20, P21)

P20/AIN0

P21/AIN1

Register B (4)

Register A (4)

TAQ1

TQ1A

Q13 Q12 Q11 Q10

Instruction clock

1/6

44

44

2

TALA

8

TABAD

8

TADAB

2

Q13

0

A-D control circuit

1

ADF

(1)

A-D

interrupt

Comparator

1

0

Q13

Successive comparison

register (AD) (10)

10

10

DAC

operation

signal

01

Q13

Q13

8

01

1

DAC

DA converter

(Note 1)

VSS

Comparator register (8)

(Note 2)

8

VDD

88

Notes 1: This switch is turned ON only when A-D converter is operating and generates the comparison voltage.

2: Writing/reading data to the comparator register is possible only in the comparator mode (Q13=1).

The value of the comparator register is retained even when the mode is switched to the A-D conversion

mode (Q13=0) because it is separated from the successive comparison register (AD). Also, the resolution

in the comparator mode is 8 bits because the comparator register consists of 8 bits.

Fig. 27 A-D conversion circuit structure

31

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