MAX5392NAUE+T

Overview

The MAX5392NAUE+T is a dual, volatile, low-voltage digital potentiometer featuring two independent 256-tap linear taper resistors with an end-to-end resistance of 100kΩ. It operates from a single +1.7V to +5.5V supply and includes an internal charge pump to maintain wiper resistance below 200Ω at low voltages. The device utilizes an I²C-compatible serial interface for control and specifies an automotive temperature range of -40°C to +125°C. Packaged in a 16-pin TSSOP, it offers low quiescent current and midscale power-up initialization.

Feature Summary

• Dual 256-Tap Linear Taper: Two independent potentiometers with 256 programmable positions each.
• I²C Interface: Supports standard bidirectional communication via SDA and SCL lines.
• Low Voltage Operation: Functions on a single supply from +1.7V to +5.5V.
• Internal Charge Pump: Ensures wiper resistance remains under 200Ω down to 1.7V supply.
• Automotive Grade: Specified for operation between -40°C and +125°C.

Applications

• Mechanical Potentiometer Replacement
• Offset and Gain Control in Amplifier Circuits
• Adjustable Voltage References and Linear Regulators
• Portable Electronics and Low-Voltage Battery Applications

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status associated with the '+' designation. Ensure the 100kΩ resistance variant matches the NAUE part number requirements. Check for obsolescence or lifecycle status updates from Analog Devices/Maxim Integrated before finalizing procurement plans.

Selection Notes

Select the MAX5392NAUE+T specifically for applications requiring 100kΩ end-to-end resistance; other variants offer 10kΩ or 50kΩ. Consider the volatile nature of the memory, as settings are lost upon power loss. Verify that the I²C bus speed requirements do not exceed the 400kHz maximum SCL frequency. Ensure the load capacitance on the SDA/SCL lines remains within the 400pF limit.

Part Context

This component belongs to the MAX5392 family of dual digital potentiometers manufactured by Maxim Integrated (now Analog Devices). The NAUE suffix denotes the 100kΩ resistance value and the 16-pin TSSOP package. The device is designed to replace mechanical pots in space-constrained portable and automotive designs.

Replacement Considerations

Direct pin-compatible replacements within the same family include MAX5392LAUE+T (10kΩ) and MAX5392MAUE+T (50kΩ), provided the resistance value difference is acceptable for the circuit design. Other series may require schematic modifications due to interface or voltage differences.

FAQ

What is the wiper position upon power-up?

Both wipers A and B initialize to the midscale position, corresponding to code 80h, upon power-up.

How does the device handle low supply voltages?

An internal charge pump guarantees that the maximum wiper resistance (R_WL) remains less than 200Ω even when the supply voltage is as low as 1.7V.

Can multiple MAX5392 devices share the same I²C bus?

Yes, up to eight devices can share a common bus by configuring the address inputs A0, A1, and A2 to unique combinations of VDD or GND.

Is readback supported on this device?

No, the MAX5392 does not support readback operations; it only accepts write commands to update the wiper positions.