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MAX3325 Fiches technique(PDF) 6 Page - Maxim Integrated Products |
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MAX3325 Fiches technique(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page 3V Dual RS-232 Transceiver with LCD Supply and Contrast Controller 6 _______________________________________________________________________________________ NAME FUNCTION 1 C2+ Positive Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 0.22µF capacitor. 2 C2- Negative Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2- to C2+ with a 0.22µF capacitor. PIN 3 V- Output of Negative Charge Pump. Bypass V- to GND with a 0.22µF capacitor. 4, 5 R_IN RS-232 Receiver Inputs 10 TEMP Output of Temperature Sensor. Connect TEMP to FB with a series resistor to compensate LCD contrast for changing temperature. Bypass TEMP with a 0.22µF capacitor to GND. 9 LCD Output of Negative Regulator. Connect LCD to FB with a series resistor. Bypass with a 0.47µF capacitor to GND. 8 VL Supply Input for Receiver Outputs. Connect VL to the system logic supply voltage. 6, 7 R_OUT TTL/CMOS Receiver Outputs 15 UP DAC Adjust Input. A falling edge on UP increments the internal 6-bit DAC counter. 14 DAC Output of Internal 6-Bit DAC. Connect DAC to FB with a series resistor to adjust LCD voltage. 13 REF+ Output of Positive Reference, +1.2V. Bypass REF+ with a 0.22µF capacitor to GND. 12 FB Feedback Input for Negative Regulator. Regulates when FB is at zero (0). 11 REF- Output of Negative Reference, -1.2V. Bypass REF- with a 0.22µF capacitor to GND. Pin Description 16 DOWN DAC Adjust Input. A falling edge on DOWN decrements the internal 6-bit DAC counter. 17 SDLCD Active-Low Shutdown-Control Input for Both Regulators, References, DAC, and Temperature Sensors. Drive SDLCD low to disable all analog circuitry. Drive high to enable the analog circuitry. 26 VDD +3.0V to +3.6V Supply Voltage. Bypass VDD with a 0.22µF capacitor to GND. 25 GND Ground 24 C1- Negative Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1- to C1+ with a 0.22µF capacitor. 18 SD232 Active-Low Shutdown-Control Input for Transmitter Outputs. Drive SD232 low to disable the RS-232 transmitters. Drive high to enable the transmitters. 23 REG Output of Positive Regulator. Bypass REG with a 4.7µF capacitor to GND. 21, 22 T_OUT RS-232 Transmitter Outputs 19, 20 T_IN TTL/CMOS Transmitter Inputs 28 C1+ Positive Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1+ to C1- with a 0.22µF capacitor. 27 V+ Output of Positive Charge Pump. Bypass V+ to VDD with a 0.22µF capacitor. |
Numéro de pièce similaire - MAX3325 |
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Description similaire - MAX3325 |
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