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MAX3325：3V、双路RS-232收发器，带有LCD电源及对比度控制器

+3V RS-232收发器，能够为LCD显示器提供供电/偏置

The MAX3325 integrates a two-transmitter, two-receiver RS-232 transceiver with an LCD supply plus temperature-compensated contrast control. It is intended for small 3V instruments requiring a 5V supply for either logic or an LCD display, an adjustable bias signal for contrast, LCD temperature compensation, and an RS-232 interface for serial communications. The 5V supply is a regulated charge pump followed by a low-dropout (LDO) linear regulator capable of supplying 11mA for the 5V LCD power. The MAX3325 has an internal 6-bit digital-to-analog converter (DAC) providing 64 contrast levels, plus an internal temperature sensor that compensates the LCD's contrast for changes in ambient temperature. The LCD contrast can be designed for any voltage range from -5V to +2V. The MAX3325's 250kbps RS-232 transceiver meets all EIA-232E specifications with input voltages from +3.0V to +3.6V. Both the RS-232 section and the LCD supply circuitry can be independently placed in shutdown, tailoring power consumption for battery-powered equipment. The MAX3325 is available in 28-pin SSOP and narrow DIP packages.

关键特性 +3.0V to +3.6V Single-Supply Operation Provides 5.0V Regulated Output at 11mA in 3V Systems 6-Bit DAC with Up/Down Interface for LCD Contrast Adjustment Selectable Positive or Negative LCD Bias Meets EIA-232E Specifications at 250kbps-Guaranteed 1µA Shutdown Mode Uses Small 0.22µF Capacitors-No Inductors Required Temperature Sensor for LCD Contrast Compensation Simple, Flexible Design Procedure for a Broad Range of LCD Displays

MAX3325：典型工作电路 应用 GPS接收机 手持式医疗设备 手持终端 工业测试设备 PDA与掌上电脑

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• MAX3222E：±15kV ESD保护、电流低至10nA、3.0V至5.5V供电、速率高达1Mbps的真RS-232收发器
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• MAX3224：1µA电源电流、1Mbps、3.0V至5.5V、RS-232收发器，提供AutoShutdown Plus
• MAX3225：1µA电源电流、1Mbps、3.0V至5.5V、RS-232收发器，提供AutoShutdown Plus
• MAX3224E：±15kV ESD保护、1µA、1Mbps、3.0V至5.5V、RS-232收发器，提供AutoShutdown Plus
• MAX3225E：±15kV ESD保护、1µA、1Mbps、3.0V至5.5V、RS-232收发器，提供AutoShutdown Plus
• MAX3222：3.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容
• MAX3232：3.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容

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