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1、_概述DS3902是双路、非易失、低温度系数、256级用户可选 的可变数字电阻器。DS3902能够工作在2.4V到 5.5V的宽 电压范围内，可通过 I2CTM兼容的串行接口与其通信。内 部地址设置允许将 DS3902从设备地址编程设置为 128个 可能地址之一。DS3902价格低廉，体积小巧，是替代传 统机械调节电阻器的理想产品。_应用光收发器光转发器仪表与工业控制射频功放音频功放偏置替代机械式可变电阻器和 DIP开关_特性 双路256级线性数字电阻器 可提供50k/30k或50k/15k阻值 电阻设置保存于非易失存储器 低温度系数I2C兼容串行接口 宽工作电压范围(2.4V至5.5V) 软
2、件写保护 用户EEPROM存储器 从设备地址可编程 工作温度范围：-40C至 +95C 小型 8引脚 SOP封装DS3902双路、非易失、可变电阻器， 带有用户EEPROM _ Maxim Integrated Products1SCLSDAADD_SEL1GND2-WIRE MASTER4.7k4.7k0.1FH1H0VCCVCCVCCVCCOUT-OUT+BIAS+BIAS-MDIN+ IN-TX_FAULTTX_DISABLEBIASMAX2APCSET2MODSET2PC_MONBS_MONBIAS SETMOD SETNOTES:1. WITH ADD_SEL TIED TO GND
3、, THE SLAVE ADDRESS WILL BE A2H. 2. FOR A DETAILED APPLICATION DIAGRAM OF A SPECIFIC LD,CONSULT THE LASER DRIVER DATA SHEET.LASER DRIVER ICDS3902_典型工作电路Rev 0; 5/04本文是 Maxim正式英文资料的译文，Maxim不对翻译中存在的差异或由此产生的错误负责。请注意译文中可能存在文字组织或 翻译错误，如需确认任何词语的准确性，请参考 Maxim提供的英文版资料。 索取免费样品和最新版的数据资料，请访问 Maxim的主页：www.maxim-
4、。*Add /T&R for Tape & Reel orders._定购信息引脚配置见数据手册最后部分。PARTRESISTOR VALUES (R0, R1)TOP BRANDPIN- PACKAGEDS3902U-53030k, 50k3902A8 SOPDS3902U-51515k, 50k3902B8 SOPI2C是Philips Corp.的一个商标。购买Maxim Integrated Products，Inc.或其从属授权公司的I2C产品，即得到了Philips I2C的专利许可， 将这些产品用于符合Philips定义的I2C标准规范的系统。DS3902双路、非易失、可变电阻器
5、， 带有用户EEPROM 2_ABSOLUTE MAXIMUM RATINGSRECOMMENDED DC OPERATING CONDITIONS(TA= -40C to +95C)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions b
6、eyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Voltage Range on VCC, SDA, SCL, H0, and H1 Relative to Ground.-0.5V to +6.0V Voltage Range on ADD_SEL Relative to
7、Ground.-0.5V to (VCC+ 0.5V), not to exceed 6.0V Resistor Current.3mAOperating Temperature Range .-40C to +95C Programming Temperature Range.0C to +70C Storage Temperature Range.-55C to +125C Soldering Temperature.See IPC/JEDEC J-STD-020A SpecificationPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Vol
8、tageVCC(Note 1)+2.4+5.5VInput Logic 1 (SDA, SCL, ADD_SEL)VIH0.7 x VCCVCC + 0.3VInput Logic 0 (SDA, SCL, ADD_SEL)VIL-0.3+0.3 x VCCVResistor InputsH0, H1-0.3+5.5VResistor CurrentIRES3mADC ELECTRICAL CHARACTERISTICS(VCC= +2.4V to +5.5V, TA= -40C to +95C, unless otherwise noted.)PARAMETERSYMBOLCONDITION
9、SMINTYPMAXUNITSStandby CurrentISTBY(Note 2)200AInput LeakageIL-1+1AVOL13mA sink current00.4Low-Level Output Voltage (SDA)VOL26mA sink current00.6VANALOG RESISTOR CHARACTERISTICS(VCC= +2.4V to +5.5V, TA= -40C to +95C, unless otherwise noted.)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSResistance Tolerance
10、TA = +25C-20+20%Position 0 Resistance160250Absolute Linearity(Note 3)-1+1LSBRelative Linearity(Note 4)-0.75+0.75LSBTemperature CoefficientAt position FFh. (Notes 5, 6)-300+300ppm/CHigh-Impedance Resistor CurrentIRHIZH0, H1 = VCC-1+1ADS3902双路、非易失、可变电阻器， 带有用户EEPROM _3AC ELECTRICAL CHARACTERISTICS (Fig
11、ure 1)(VCC= +2.4V to +5.5V, TA= -40C to +95C, unless otherwise noted. Timing referenced to VIL(MAX)and VIH(MIN).)Note 1: All voltages referenced to ground. Note 2: ISTBYspecified for the inactive state measured with SDA = SCL = VCC, ADD_SEL = GND, and with H0 and H1 floating. Note 3: Absolute linear
12、ity is the difference of measured value from expected value at resistor position. Expected value is from the measured minimum position to measured maximum position. Note 4: Relative linearity is the deviation of an LSB resistor setting change vs. the expected LSB change. Expected LSB slope of the st
13、raight line is the typical operating curves from the measured minimum position to measured maximum position. Note 5: See the Typical Operating Characteristics section. Note 6: Guaranteed by design. Note 7: Timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with
14、 I2C standard mode. Note 8: CBtotal capacitance of one bus line in picofarads. Note 9: EEPROM write begins after a STOP condition occurs.PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSCL Clock FrequencyfSCL(Note 7)0400kHzBus Free Time Between STOP and START ConditionstBUF1.3sHold Time (Repeated) START ConditiontHD:STA0.6sLow Period of SCLtLOW1.3sHigh Period of SCLtHIGH0.6sData Hold TimetHD:DAT00.9sData Setup TimetSU:DAT100sStart
