MAX5529GUA+

Overview

The MAX5529GUA+ is a one-time programmable, linear-taper digital potentiometer manufactured by Analog Devices Inc./Maxim Integrated. It provides an end-to-end resistance of 10kΩ with 64 wiper tap positions and operates on a single +2.7V to +5.5V supply. The device features a simple 2-wire up/down interface for adjusting the wiper position and includes an optional OTP feature that sets and locks the power-on reset position. It offers ultra-low static supply current (max 1.5µA) and low temperature coefficients (35ppm/°C end-to-end). Packaged in an 8-pin µMAX format, it operates over a -40°C to +105°C temperature range.

Feature Summary

• One-Time Programmable (OTP) memory allows setting and locking the power-on reset wiper position via a six-step sequence using an 11V PV pin.
• 64 Tap Positions with Linear Taper providing precise digital control over resistance.
• Ultra-Low Power Consumption featuring a maximum static supply current of 1.5µA.
• Simple 2-Wire Interface utilizing CS and U/D pins for sequential increment or decrement operations.

Applications

• LCD contrast control where voltage biasing adjusts display contrast
• Programmable filters requiring adjustable gain or cutoff frequency
• Adjustable voltage reference circuits

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated by the '+' suffix in the part number. Ensure proper handling procedures are followed due to the surface-mount nature of the µMAX package.

Selection Notes

Select the MAX5529GUA+ when a 10kΩ end-to-end resistance is required. Compare against MAX5527GUA+ (100kΩ) and MAX5528GUA+ (50kΩ) if different resistance values are needed. Consider the 8-pin µMAX package constraints and verify that the 2-wire serial interface meets system timing requirements.

Part Context

The MAX5529GUA+ belongs to the MAX5527/MAX5528/MAX5529 family of one-time programmable, linear-taper digital potentiometers. These devices replace mechanical potentiometers with a digitally controlled alternative. The 'GUA+' suffix specifically denotes the 8-pin µMAX package type and lead-free/RoHS-compliant construction.

Replacement Considerations

Direct functional substitutes within the same family include MAX5527GUA+ (100kΩ) and MAX5528GUA+ (50kΩ), provided the resistance value difference is acceptable for the application. Verify pinout compatibility and electrical specifications before substitution.

FAQ

How is the wiper position locked after programming?

The wiper position is locked by pulsing the CS pin high for seven cycles during the one-time programming sequence. This disables the up/down interface, effectively converting the device into a fixed resistor divider.

What is the purpose of the PV pin?

The PV pin is used for one-time programming. It requires an external voltage source between +11V and +11.55V to program the wiper's power-on reset position and lock it.

What happens if the device is programmed more than once?

Since the device uses one-time programmable (OTP) memory, applying multiple programming values results in all applied values being ORed together. For example, programming 010101 and then 101010 results in 111111.