STMicroelectronics STM6601DS2BDM6F

Overview

STM6601DS2BDM6F 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 - enabling robust startup validation in smartphones, audio players, and PDAs.

For engineers reviewing the STM6601DS2BDM6F datasheet, STM6601DS2BDM6F pinout, STM6601DS2BDM6F application, or STM6601DS2BDM6F equivalent, this device is selected for its guaranteed power-on lockout behavior, PB/SR debounced inputs with ±15 kV air-discharge ESD tolerance, active-high/active-low enable output options, and integrated undervoltage detection with separate VCCLO and INT outputs - critical for fail-safe embedded power management.

Technical Context

The STM6601 implements a deterministic power-up sequence where the PSHOLD input must be driven high within a fixed tON_BLANK timeout (not user-adjustable) to confirm microprocessor readiness - unlike the STM6600's push-button-hold-dependent startup. Its logic block integrates edge-detecting debounce for PB and SR inputs, glitch-immune comparators for VTH+ (3.4 V typ.) and VTH– thresholds, and independent timing generators for tREC (reset pulse width), tDEBOUNCE (25 ms typ.), and tINT_Min (10 ms min).

Smart Reset™ assertion is triggered only after simultaneous PB+SR press sustained for tDEBOUNCE + tSRD, where tSRD is set by CSRD capacitor charging via ISRD current (1.2 µA typ.). The device provides three dedicated open-drain status outputs - VCCLO (high-threshold comparator), INT (combined PB/undervoltage interrupt), and RST (reset pulse) - each with defined assertion timing and pull-up requirements.

Key Specifications

Pinout & Package

STM6601DS2BDM6F is housed in a 2 × 3 mm TDFN12 package with exposed thermal pad (pin 13 not electrically connected). The package supports reflow soldering per JEDEC J-STD-020 and offers low thermal resistance for reliable operation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM6600DS2BDM6F, the STM6601DS2BDM6F adds deterministic startup security via fixed tON_BLANK, while TPS3808G33DBVR omits all push-button logic and power-control outputs - making STM6601 the sole option for integrated, ESD-hardened, reference-equipped power sequencing in space-constrained portable designs.

Availability

STM6601DS2BDM6F is available at Aetrix Electronics and suitable for smartphone power sequencing, portable audio player startup, industrial handheld terminals, and PDA system power management requiring stable component supply across production lifecycles.

Supply support for STM6601DS2BDM6F 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 intelligent power, sensing, connectivity, and microcontroller solutions for industrial, automotive, and consumer markets.

The STM660x series belongs to ST's Smart Power Management portfolio, engineered specifically for ultra-low-power, ESD-resilient, push-button-driven power sequencing in battery-operated portable electronics - emphasizing hardware-enforced reliability over firmware-dependent control.

FAQ

What is the function of the PSHOLD pin on STM6601DS2BDM6F?

The PSHOLD pin is a hardware confirmation input that must be driven high within 250 ms (tON_BLANK) of VCC reaching VTH+ to sustain the EN output assertion. During startup, an internal pull-down ensures PSHOLD defaults low; once the host processor initializes, it drives PSHOLD high to validate successful boot - preventing EN release due to MCU non-response or faulty switch contact.

How does the CSRD pin configure Smart Reset™ timing?

The CSRD pin accepts an external capacitor to ground that sets the Smart Reset™ delay time (tSRD) via controlled charging by a 1.2 µA internal current source. When PB and SR are pressed simultaneously, tSRD begins counting after tDEBOUNCE expires; reset assertion occurs only after tDEBOUNCE + tSRD elapses - enabling user-tunable long-press duration without firmware involvement.

Can STM6601DS2BDM6F generate both reset and interrupt signals simultaneously?

Yes - the INT output asserts low for either PB press (after tDEBOUNCE) or VCC undervoltage detection, while RST pulses low only upon validated long-push (PB+SR held ≥ tDEBOUNCE + tSRD). The PBOUT output remains low during PB press, allowing firmware to distinguish whether INT was triggered by button action or supply fault - enabling differentiated system responses.

Is the VREF output mandatory to use even if not connected to external circuitry?

Yes - a 1 µF ceramic capacitor must be connected between VREF and GND regardless of whether the 1.5 V reference is utilized. This capacitor stabilizes the internal reference buffer and prevents oscillation or erratic behavior; omission risks improper device operation, especially during power transitions or under load transients.