DS1050U-025+T

Overview

The DS1050U-025+T is a 5-bit programmable pulse-width modulator (PWM) in an 8-pin 118-mil µSOP package. It operates from a 2.7V to 5.5V supply with a typical active current of 50µA and standby current under 1µA. The device provides a fixed output frequency of 25kHz with adjustable duty cycles from 0% to 96.88% in 3.125% steps, or 100% via a dedicated command. Control is managed through a 2-wire addressable serial interface supporting standard (100kHz) and fast (400kHz) modes.

Feature Summary

• 5-bit PWM resolution with 0% to 96.88% duty cycle adjustment in 3.125% increments
• Fixed 25kHz output frequency with ±20% tolerance
• 2-wire addressable serial interface compatible with standard and fast mode protocols
• Low power consumption: 50µA active, <1µA shutdown current

Applications

• LCD contrast and brightness control
• Power supply voltage adjustment
• Battery charging or current adjustment

Procurement Notes

Verify the ordering suffix '+T' indicates tape and reel packaging if required for automated assembly. Confirm the 'U' suffix corresponds to the 8-pin 118-mil µSOP package. Ensure the '-025' designation matches the required 25kHz frequency specification for the target application.

Selection Notes

Select this component when a fixed 25kHz PWM signal is required with digital duty cycle control. The 2-wire interface allows multiple devices on a single bus using address pins A0-A2. Consider the 5-bit resolution limits; higher precision requires different architectures. Verify voltage compatibility within the 2.7V to 5.5V range.

Part Context

The DS1050 series includes variants with frequencies of 1kHz, 5kHz, 10kHz, and 25kHz. The 'U' suffix denotes the space-saving 8-pin µSOP package, while 'Z' denotes the standard 8-pin SOIC. The '+' suffix indicates compliance with RoHS standards. This specific part is manufactured by Analog Devices/Maxim Integrated.

Replacement Considerations

Direct pin-compatible replacements within the same family include DS1050U-001+T (1kHz), DS1050U-005+T (5kHz), and DS1050U-010+T (10kHz). Cross-family replacements require verification of interface compatibility and electrical specifications.

FAQ

What is the maximum duty cycle achievable without the special command?

The standard 5-bit register supports duty cycles up to 96.88%. A dedicated command is required to achieve 100% duty cycle.

How does the device handle bus arbitration?

The DS1050 operates as a slave on the 2-wire bus. It acknowledges received bytes but does not generate clock pulses or initiate transfers, relying on the master device for bus control.

What is the response time for duty cycle changes?

A change in PWM output duty cycle occurs within two periods of the output frequency after the command is initiated.