STMicroelectronics STM6601CQ2BDM6F

Overview

STM6601CQ2BDM6F 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 window - used in smartphones, audio players, and PDAs for reliable cold-start control.

For engineers reviewing the STM6601CQ2BDM6F datasheet, STM6601CQ2BDM6F pinout, STM6601CQ2BDM6F application, or STM6601CQ2BDM6F equivalent, this device provides deterministic power-up timing, debounced PB/SR inputs with ±15 kV air-discharge ESD tolerance, open-drain/interrupt/reset outputs, and fail-safe PSHOLD validation - critical for embedded systems requiring robust user-initiated power management.

Technical Context

The STM6601 implements a state-machine-based power controller with dual-voltage threshold detection (VTH+ = 3.4 V typ., VTH– hysteresis = 200 mV), internal 100 kΩ PB pull-up, optional SR pull-up, and glitch-immune edge detection on PB and SR inputs. Its logic distinguishes short push (INT assertion), long push (RST or EN deassertion), and undervoltage events (VCCLO/INT activation) using configurable timing windows including tDEBOUNCE, tINT_Min, and fixed tON_BLANK.

Unlike the STM6600, the STM6601 mandates PSHOLD confirmation within tON_BLANK after PB press to sustain EN assertion - preventing false turn-on during faulty switch or unresponsive MCU conditions. The device integrates a dedicated 1.5 V reference (1% accuracy, 1 µF mandatory bypass) and supports both active-high EN and active-low EN variants via factory configuration.

Key Specifications

Pinout & Package

STM6601CQ2BDM6F is housed in a TDFN12 (2 mm × 3 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad, optimized for space-constrained portable PCB layouts and low-profile applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart push-button controller applications.

Compared with STM6600CQ2BDM6F, the STM6601 offers stricter power-up validation via tON_BLANK, improving robustness against MCU hang-ups; versus TPS3808G33DBVR, it delivers complete push-button interface, reset, interrupt, and reference integration - eliminating four discrete components.

Availability

STM6601CQ2BDM6F is available at Aetrix Electronics and suitable for smartphone power sequencing, portable audio player control, industrial handheld terminals, and medical PDA power management requiring stable component supply across extended production lifecycles.

Supply support for STM6601CQ2BDM6F 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 emphasis on energy efficiency and system integration.

The STM6600/STM6601 product line targets ultra-low-power portable electronics requiring intelligent, ESD-hardened push-button control - combining power sequencing, reset generation, voltage monitoring, and reference provision in one TDFN package.

FAQ

What is the function of the PSHOLD pin on STM6601CQ2BDM6F?

The PSHOLD pin serves as a fail-safe confirmation signal during power-up: the host MCU must drive it high within the fixed tON_BLANK window after PB press to sustain EN assertion. If unconfirmed, EN deasserts - preventing system enable under faulty MCU or switch conditions. During normal operation, pulling PSHOLD low deasserts EN to initiate controlled shutdown.

How does STM6601CQ2BDM6F differentiate between a push-button interrupt and an undervoltage interrupt?

It uses the PBOUT pin state: when INT goes low, reading PBOUT determines the cause - PBOUT low indicates PB press; PBOUT high indicates VCC < VTH–. This eliminates need for separate monitoring circuitry and enables firmware to execute distinct responses (e.g., sleep vs. save-and-shutdown) without additional GPIO resources.

Is the VREF output mandatory to use, and what happens if left unconnected?

Yes - a 1 µF ceramic capacitor is mandatory on VREF regardless of usage, per ST's datasheet requirement. Without it, the internal reference circuit becomes unstable, potentially causing erratic reset timing, inaccurate VTH+ detection, or increased supply current. The capacitor ensures loop stability and noise immunity for the precision 1.5 V generator.

Can STM6601CQ2BDM6F support both active-high and active-low enable outputs?

Yes - the device is factory-configured as either EN (active-high push-pull) or EN (active-low open-drain). STM6601CQ2BDM6F specifically uses the EN variant (active-high), confirmed by its ordering code suffix 'CQ2' and datasheet Table 1. No external inversion or level-shifting is required to interface with standard MOSFET gate drivers or DC-DC enable inputs.