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DS3904 데이터시트(PDF) 1 Page - Dallas Semiconductor |
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DS3904 데이터시트(HTML) 1 Page - Dallas Semiconductor |
1 / 11 page General Description The DS3904/DS3905 contain three nonvolatile (NV) low temperature coefficient, variable digital resistors. Each resistor has 128 user-selectable positions. Additionally, the DS3904/DS3905 have a high-impedance setting that allows each resistor to function as a digital switch. The DS3904/DS3905 can operate over a 2.7V to 5.5V supply voltage range, and communication with the device is achieved through a 2-wire serial interface. Address pins allow multiple DS3904/DS3905s to operate on the same two-wire bus. The DS3904 has one address pin, allow- ing two DS3904s to share the bus, while the DS3905 has three address pins, allowing up to eight DS3905s to share a common bus. The low-cost and small size of the DS3904/DS3905 make them ideal replacements for con- ventional mechanical trimming resistors. Applications Power-Supply Calibration Cell Phones and PDAs Fibre Optic Transceiver Modules Portable Electronics Small and Low-Cost Replacement for Conventional Mechanical Trimming Resistors/ Dip Switches Test Equipment Features ♦ Three 20kΩ, 128-Position Linear Digital Resistors ♦ Resistor Settings are Stored in NV Memory ♦ Each Resistor has a High-Impedance Setting for Switch Operation to Control Digital Logic ♦ Low Temperature Coefficient ♦ 2-Wire Serial Interface ♦ 2.7V to 5.5V Operating Range ♦ -40°C to +85°C Industrial Temperature ♦ Packaging: 8-Pin µSOP for DS3904, 10-pin µSOP for DS3905 Triple 128-Position Nonvolatile Digital Variable Resistor/Switch _____________________________________________ Maxim Integrated Products 1 8 6 5 1 3 4 SDA TOP VEIW A0 7 2 SCL H0 H1 H2 µSOP VCC GND DS3904 10 1 A1 A2 9 2 SDA A0 µSOP 8 3H0 SDL 7 4 H1 VCC 6 5 H2 GND DS3905 Pin Configurations 0.1 µF 4.7k Ω 2-WIRE MASTER VCC VCC H0 H1 H2 RHIZ R10 VCC SCL SDA (DS3905 ONLY) A1 A2 RESISTOR 0 20k Ω ADDR F8h RESISTOR 1 20k Ω ADDR F9h RESISTOR 2 20k Ω ADDR FAh A0 GND 4.7k Ω VARIABLE RESISTANCE FOR ADJUSTABLE CURRENT SOURCE INTERFACE EXAMPLES 2-WIRE ADDRESSABLE SWITCH (USING 00h AND RHIZ SETTINGS) GAIN CONTROL VIN DS3904/DS3905 VCC RHIZ RHIZ R11 DIGITAL LOGIC R12 Typical Operating Circuit Ordering Information Rev 1; 8/03 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN- PACKAGE RESISTANCE DS3904U-020 -40 °C to +85°C 8 µSOP 20k Ω + Hi-Z DS3905U-020 -40 °C to +85°C 10 µSOP 20k Ω + Hi-Z |
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