STMicroelectronics STM6601AU2DDM6F

Overview

STM6601AU2DDM6F from STMicroelectronics is a smart push-button on/off controller with Smart Reset™ and power-on lockout functionality, designed for secure system power sequencing in battery-powered portable electronics. It operates from 1.6 V to 5.5 V, delivers 0.6 µA standby current, features a precise 1.5 V ±1% voltage reference, supports adjustable Smart Reset™ delay via external CSRD capacitor, and enforces fixed tON_BLANK power-up confirmation - used in smartphones, audio players, and PDAs to prevent faulty turn-on.

For engineers reviewing the STM6601AU2DDM6F datasheet, STM6601AU2DDM6F pinout, STM6601AU2DDM6F application, or STM6601AU2DDM6F equivalent, this device is selected for ultra-low-power push-button interface design requiring fail-safe startup validation, undervoltage detection, interrupt generation, and MOSFET/DC-DC enable control in space-constrained portable systems.

Technical Context

The STM6601 implements a deterministic power-up sequence where PB press initiates startup, but EN assertion requires PSHOLD confirmation within a fixed tON_BLANK window - unlike the STM6600's PB-hold-dependent timing. Its internal logic combines debounced edge detection on PB/SR inputs, factory-trimmed VTH+ (3.4 V typ.) and VTH− thresholds, and glitch-immune SRD timing based on CSRD capacitor charging current (ISRD = 1.2 µA typ.).

It integrates dual-purpose outputs: open-drain INT signals undervoltage or PB press events (distinguishable via PBOUT), while push-pull EN directly drives external power devices. The 1.5 V reference (1% accuracy, 30 ppm/°C drift) powers external monitoring circuits and remains active only during normal operation - disabled in standby.

Key Specifications

Pinout & Package

STM6601AU2DDM6F is housed in a TDFN12 (2 mm × 3 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad, optimized for compact portable PCB layouts and efficient heat dissipation in high-density applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar push-button power control applications.

Compared with TPS3808G33DBVR and MAX16054ETA+, the STM6601AU2DDM6F uniquely integrates push-button interface, fixed tON_BLANK lockout, Smart Reset™ delay tuning, and dual-event interrupt differentiation - reducing external component count and firmware burden in portable power management.

Availability

STM6601AU2DDM6F is available at Aetrix Electronics and suitable for smartphone power sequencing, portable audio player startup, industrial handheld terminals, and medical PDA power management requiring stable component supply across extended production lifecycles.

Supply support for STM6601AU2DDM6F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering innovative solutions across automotive, industrial, and consumer markets with strong IP in power management and mixed-signal ICs.

The STM6601 belongs to ST's Smart Power On/Off Controller product line, engineered specifically for ultra-low-power, secure, and ESD-hardened push-button interface in space- and energy-constrained portable electronics.

FAQ

What is the function of the PSHOLD pin on STM6601AU2DDM6F?

The PSHOLD pin serves as a hardware-based power-up confirmation signal. During startup, the MCU must drive PSHOLD high within the fixed tON_BLANK window (250 ms) to validate successful initialization and sustain the EN output. If unconfirmed, EN deasserts - preventing unreliable system boot from faulty switches or hung processors. This is a core fail-safe feature distinguishing STM6601 from simpler supervisors.

How does the CSRD pin adjust Smart Reset™ timing?

The CSRD pin accepts an external capacitor to ground, which charges at a constant 1.2 µA current. When voltage across the capacitor reaches the internal VSRD threshold (~1.2 V), the Smart Reset™ delay tSRD expires. With tSRD = CSRD × 0.83 s/µF, a 100 nF capacitor yields ~83 ms delay - enabling precise, field-tunable long-press behavior for reset or power-down without firmware changes.

Can STM6601AU2DDM6F generate both reset and interrupt signals simultaneously?

No - it generates mutually exclusive actions based on timing and input conditions. A short PB press triggers INT during normal operation; a long PB+SR press asserts RST (if configured for RST-on-long-press) or deasserts EN (if configured for EN-deassert-on-long-press). Undervoltage also asserts INT, but RST is only active at startup or on confirmed long-press - never concurrently with INT under the same event.

Is the VREF output required to be used in every application?

No - the VREF output is optional but its decoupling capacitor is mandatory. Even if unused, a 1 µF ceramic capacitor must be placed on VREF to stabilize internal reference circuitry and ensure proper device operation. Omitting it risks erratic behavior in reset timing, threshold detection, and INT assertion - per ST's design guidelines in Section 2 of the datasheet.