MCNIX MX172MC Datasheet

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MX172

FEATURES

Package : 14-pin SSOP

Operating voltage : 2V~4V

Operating temperature : -25oC~60oC

Supply current : max. 10mA (without output current)

Input current level : 1nA~5uA

DESCRIPTION

MX172 is designed for Triangular system auto focus cameras. It is regarded as input component for PSD (Position Sensitive Diode), and comprises of circuits that drive AF magnet as output, an infrared emission diode current control circuit, and control circuit of sequential timing.

TRIANGULAR TYPE AUTO FOCUS IC

Surround light level : max. 50uA (PSD output current)

IRED drive output : min. 20mA

Magnet drive current : min. 200mA

Measuring time : max. 50ms

PIN CONFIGURATION

 

 

 

 

PIN FUNCTIONS

 

14 SSOP

 

 

 

 

 

 

 

SYMBOL

PIN NAME

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

Ground Pin

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

14

 

 

OUT1

CH1

Hold Capacitor Pin 1

 

 

 

 

 

 

CH1

 

 

2

 

13

 

 

OUT2

 

 

 

 

 

 

 

PSD1

PSD Input Pin 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PSD1

 

 

3

 

12

 

 

IRED

 

 

 

 

MX172

 

 

PSD2

PSD Input Pin 2

 

 

 

 

 

 

 

 

PSD2

 

 

4

11

 

 

CTRL

 

 

 

 

 

 

 

 

 

 

 

CH2

Hold Capacitor Pin 2

CH2

 

 

5

 

10

 

 

CT

 

 

 

 

 

 

 

 

 

 

VCC

Supply Pin (Secondly)

VCC

 

 

6

 

9

 

 

VR1

 

 

 

 

 

 

 

 

VE

Supply Pin (Battery)

VE

 

 

7

 

8

 

 

VR2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VR2

VR Pin for Adjustment 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VR1

VR Pin for Adjustment 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CT

Timing Capacitor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CTRL

Power Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IRED

Output Control for IRED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUT2

Data Output Pin 2 (MSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUT1

Data Output Pin 1(LSB)

 

 

 

 

 

 

 

 

 

 

 

P/N: PM0168

1

REV. 2.1, AUG 29, 1995

MX172

BLOCK DIAGRAM

 

VR1

VR2

 

 

 

GND

 

Comparator

 

 

 

 

 

 

 

 

 

Surrounding light

 

 

 

 

 

rejection 1

AF Adjust

Latch

 

 

CH1

 

Output

Output1, 2

 

and

 

 

 

Driver

 

 

 

 

 

 

 

 

 

Encode

 

PSD1

Head Amp.1

 

 

 

 

 

 

Inf.Cramp

 

 

IRED

 

 

 

 

 

PSD2

Head Amp.2

 

 

 

 

 

 

Operation

IRED Drive Circuit

 

CH2

Surrounding light

 

 

 

 

rejection 2

 

 

 

 

 

 

 

 

 

 

 

Sequence Control Logic

 

Timing Circuit

 

Vcc

 

 

 

 

 

 

Switch

 

 

 

VE

 

 

 

 

 

 

 

CTLR

 

C Timing

 

BASIC CONNECTION DIAGRAM

 

1

GND

OUT1 14

C1

2

CH1

OUT2 13

C2

 

 

IRED

 

0.47mF

 

 

 

3

PSD1

IRED 12

 

PSD

 

 

R3

 

4

PSD2

 

 

CTRL 11

 

 

 

 

SW1

 

 

 

 

C4

 

5

CH2

C TIMING 10

 

C3

 

 

0.022mF

 

0.47mF

 

 

VR1

 

6

VCC

VR1

 

9

 

 

 

VR2

VR2

 

7

VE

8

P/N: PM0168

REV. 2.1, AUG 29, 1995

2

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