STMicroelectronics STM6601BS2BDM6F

Overview

STM6601BS2BDM6F 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 STM6601BS2BDM6F datasheet, STM6601BS2BDM6F pinout, STM6601BS2BDM6F application, or STM6601BS2BDM6F equivalent, key selection criteria include tON_BLANK timing compliance, PSHOLD-driven startup validation, open-drain vs. push-pull EN output configuration, and Smart Reset™ delay programmability via CSRD - all critical for fail-safe power management in resource-constrained embedded systems.

Technical Context

The STM6601 implements a deterministic power-up sequence where PB press initiates startup, but system enable (EN) remains asserted only if PSHOLD is driven high within the fixed tON_BLANK window - preventing boot under faulty supply or unresponsive MCU. Its internal logic combines debounced edge detection on PB/SR inputs, factory-trimmed VTH+ (3.4 V typ.) and VTH− thresholds with 200 mV hysteresis, and glitch-immune state machines for interrupt, reset, and undervoltage response.

Smart Reset™ assertion requires simultaneous PB+SR press held for tDEBOUNCE + tSRD (externally set by CSRD capacitor charging), while VCCLO and INT outputs provide separate, debounced signals for high-threshold undervoltage detection and dual-source interrupt (PB vs. VCC dropout), enabling distinct firmware handling paths without additional external logic.

Key Specifications

Pinout & Package

STM6601BS2BDM6F is housed in a TDFN12 (2 × 3 mm) thermally enhanced, lead-free package with exposed thermal pad, optimized for space-constrained portable PCB layouts and efficient heat dissipation during transient load conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM6600BS2BDM6F, the STM6601 offers stricter hardware-enforced startup timing via tON_BLANK, improving reliability in MCU-boot-critical systems; versus TPS3808G125DBVR, it integrates complete push-button sequencing logic, eliminating external components and firmware complexity for portable power control.

Availability

STM6601BS2BDM6F is available at Aetrix Electronics and suitable for smartphone power sequencing, portable audio player control, industrial handheld terminals, and PDA system management requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for STM6601BS2BDM6F 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 STM660x series belongs to ST's Smart Power Management portfolio, engineered specifically for ultra-low-power, push-button-initiated power sequencing in portable and battery-operated devices - prioritizing fail-safe startup, ESD resilience, and minimal external component count.

FAQ

What is the purpose of the PSHOLD pin on the STM6601BS2BDM6F?

The PSHOLD pin enforces hardware-level startup validation: after a PB press, the STM6601 holds EN inactive until PSHOLD is driven high within the fixed tON_BLANK window. This confirms that the host MCU has initialized and can manage system power, preventing boot under unstable supply or unresponsive firmware - a critical safety feature absent in basic supervisors.

How does the CSRD pin affect Smart Reset™ behavior?

The CSRD pin accepts an external capacitor to ground that sets the Smart Reset™ delay time (tSRD). Charging this capacitor at a constant ISRD current determines how long PB and SR must be held simultaneously before triggering RST or EN deassertion. No capacitor yields immediate long-press recognition; typical values range 1–100 nF for delays from ~100 ms to several seconds - enabling field-configurable reset timing without firmware updates.

Can the STM6601BS2BDM6F operate with a 1.8 V supply?

Yes - the STM6601BS2BDM6F operates down to 1.6 V, making it fully compatible with 1.8 V systems. Its VTH+ threshold is factory-trimmed to 3.4 V (typ.), so at 1.8 V the device will not assert EN during startup; however, all internal logic, debounce, and reference functions remain active and functional within the 1.6–5.5 V range, supporting low-voltage brownout detection and controlled shutdown.

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

No - the VREF output is optional, but a 1 µF capacitor is mandatory on the VREF pin regardless of usage. This capacitor stabilizes the internal reference circuitry and prevents oscillation or startup failure. The 1.5 V ±1% reference is active only after reset deassertion and disabled in standby, making it suitable for periodic calibration or sensor biasing without continuous power penalty.