Sharp LC-32LE700E Service Manual page 82

LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
2.11. IC506 (VHiM3221EiP-1Y)
2.11.1 Block Diagram
2.11.2 Pin Connections and short description
Pin No. Pin Name
1 EN
2 C1+
3 V+
4 C1-
5 C2+
6 C2-
7 V-
8 R_IN
9 R_OUT
10 INVALID
11 T_IN
12 FORCEON
13 T_OUT
14 GND
15 VCC
16 FORCEOFF
I/O
Receiver Enable Control . Drive low for normal operation. Drive high to force the receiver outputs (R_OUT)
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into a high-impedance state.
- Positive terminal of the voltage doubler Charge-Pump Capacitor
- +5.5V generated by the charge pump
- Negative terminal of the voltage doubler Charge-Pump Capacitor
- Positive terminal of inverting Charge-Pump Capacitor
- Negative terminal of inverting Charge-Pump Capacitor
- -5.5V generated by the charge pump
I RS-232 Receiver Inputs
O TTL/CMOS Receiver Outputs
Output of the Valid Signal Detector. INVALID is enabled high if a valid RS-232 level is present on any receiver
I
input.
I TTL/CMOS Transmitter Inputs
Drive high to override automatic circuitry keeping transmitters and charge pump on (FORCEOFF must be
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high)
O RS-232 Transmitter Outputs
- Ground
- +3.0V to +5.5V Supply Voltage
Force-Off Input, active low. Drive low to shut down transmitters, receivers (MAX3243E, except R2OUTB),
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and on-board charge pump . This overrides all automatic circuitry and FORCE ON
Pin Function
7 – 16