MXIC 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 |
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PIN FUNCTIONS |
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14 SSOP |
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SYMBOL |
PIN NAME |
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GND |
Ground Pin |
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GND |
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14 |
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OUT1 |
CH1 |
Hold Capacitor Pin 1 |
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CH1 |
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2 |
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13 |
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OUT2 |
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PSD1 |
PSD Input Pin 1 |
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PSD1 |
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3 |
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12 |
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IRED |
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MX172 |
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PSD2 |
PSD Input Pin 2 |
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PSD2 |
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4 |
11 |
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CTRL |
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CH2 |
Hold Capacitor Pin 2 |
CH2 |
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5 |
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10 |
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CT |
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VCC |
Supply Pin (Secondly) |
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VCC |
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6 |
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9 |
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VR1 |
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VE |
Supply Pin (Battery) |
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VE |
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7 |
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8 |
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VR2 |
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VR2 |
VR Pin for Adjustment 2 |
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VR1 |
VR Pin for Adjustment 1 |
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CT |
Timing Capacitor |
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CTRL |
Power Control |
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IRED |
Output Control for IRED |
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OUT2 |
Data Output Pin 2 (MSB) |
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OUT1 |
Data Output Pin 1(LSB) |
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P/N: PM0168 |
1 |
REV. 2.1, AUG 29, 1995 |
MX172
BLOCK DIAGRAM
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VR1 |
VR2 |
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GND |
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Comparator |
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Surrounding light |
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rejection 1 |
AF Adjust |
Latch |
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CH1 |
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Output |
Output1, 2 |
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Driver |
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Encode |
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PSD1 |
Head Amp.1 |
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Inf.Cramp |
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IRED |
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PSD2 |
Head Amp.2 |
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Operation |
IRED Drive Circuit |
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CH2 |
Surrounding light |
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rejection 2 |
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Sequence Control Logic |
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Timing Circuit |
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Vcc |
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Switch |
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VE |
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CTLR |
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C Timing |
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BASIC CONNECTION DIAGRAM
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1 |
GND |
OUT1 14 |
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C1 |
2 |
CH1 |
OUT2 13 |
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C2 |
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IRED |
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0.47mF |
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3 |
PSD1 |
IRED 12 |
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PSD |
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R3 |
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4 |
PSD2 |
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CTRL 11 |
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SW1 |
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C4 |
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5 |
CH2 |
C TIMING 10 |
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C3 |
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0.022mF |
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0.47mF |
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VR1 |
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6 |
VCC |
VR1 |
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9 |
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VR2 |
VR2 |
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7 |
VE |
8 |
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P/N: PM0168 |
REV. 2.1, AUG 29, 1995 |
2