STMicroelectronics STM6601BM2DDM6F

Overview

STM6601BM2DDM6F 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 false turn-on during faulty switch or unresponsive MCU conditions.

For engineers reviewing the STM6601BM2DDM6F datasheet, STM6601BM2DDM6F pinout, STM6601BM2DDM6F application, or STM6601BM2DDM6F equivalent, this device is selected for ultra-low-power enable control, robust push-button debouncing, undervoltage interrupt generation, and fail-safe power-up validation requiring PSHOLD confirmation within tON_BLANK.

Technical Context

The STM6601 implements a deterministic power-up state machine where PB press initiates startup, but EN assertion requires PSHOLD confirmation within a fixed tON_BLANK window (no PB hold dependency), distinguishing it from the STM6600. Its internal logic integrates edge-triggered debounce, dual-threshold voltage monitoring (VTH+ = 3.4 V typ., VTH– hysteresis = 200 mV), and independent outputs for reset (RST), interrupt (INT), and status (PBOUT, VCCLO).

Smart Reset™ delay is externally programmable via CSRD capacitor charging at ISRD current, enabling configurable long-push detection timing. The 1.5 V reference (VREF) is enabled post-reset and disabled in standby, supporting external analog monitoring with 1 µF mandatory decoupling.

Key Specifications

Pinout & Package

STM6601BM2DDM6F is housed in a TDFN12 (2 mm × 3 mm) thermally enhanced, lead-free package with exposed thermal pad, optimized for space-constrained portable PCB layouts and low thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM6600BM2DDM6F, STM6601BM2DDM6F adds hardware-enforced boot validation via PSHOLD, improving reliability in systems with delayed MCU initialization; versus TPS3808G33DBVR, it integrates full push-button management, making it a complete power-control subsystem rather than a standalone supervisor.

Availability

STM6601BM2DDM6F is available at Aetrix Electronics and suitable for smartphone power sequencing, portable audio player control, industrial handheld terminals, and PDA system power management requiring stable component supply across extended product lifecycles.

Supply support for STM6601BM2DDM6F 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, power, and consumer markets with strong IP and manufacturing vertical integration.

STM6601 belongs to ST's Smart Power-On/Off Controller product line, engineered specifically for secure, ultra-low-power, ESD-hardened power sequencing in portable and battery-operated devices where user interface reliability and fail-safe boot are critical.

FAQ

What is the function of the PSHOLD pin on STM6601BM2DDM6F?

The PSHOLD pin is a critical hardware validation input that must be driven high by the host processor within the fixed tON_BLANK window after power-on to confirm successful MCU initialization. If unasserted, EN is deasserted to prevent unstable system operation. During startup, an internal pull-down ensures default low state, and during normal operation, driving PSHOLD low triggers controlled shutdown.

How does STM6601BM2DDM6F differ from STM6600BM2DDM6F in startup behavior?

STM6601BM2DDM6F requires PSHOLD confirmation within a fixed tON_BLANK period regardless of PB release timing, enforcing strict boot validation. STM6600BM2DDM6F instead requires the PB to remain pressed until PSHOLD is asserted - making STM6601 more tolerant of short PB presses and better suited for systems with delayed I/O availability.

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

Yes - a 1 µF ceramic capacitor is mandatory on VREF even if the 1.5 V reference is unused. Without it, the internal reference circuit becomes unstable, potentially causing erratic reset behavior or degraded accuracy of VTH+/VTH– thresholds. The capacitor ensures proper loop stability and noise immunity per ST's design requirements.

Can STM6601BM2DDM6F generate both reset and interrupt signals simultaneously?

Yes - during normal operation, pressing PB asserts INT low after tDEBOUNCE, while simultaneously holding PB and SR for >tDEBOUNCE + tSRD triggers RST assertion (if configured for RST-on-long-push). These are independent outputs: INT reflects real-time PB/undervoltage status, while RST delivers a timed pulse for system-level reset coordination.