STMicroelectronics STM6601DA2BDM6F

Overview

STM6601DA2BDM6F 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 for reliable cold-start control.

For engineers reviewing the STM6601DA2BDM6F datasheet, STM6601DA2BDM6F pinout, STM6601DA2BDM6F application, or STM6601DA2BDM6F 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.

Technical Context

The STM6601 implements a deterministic power-up sequence where PB press initiates startup, but full enable assertion (EN) requires PSHOLD confirmation within a fixed tON_BLANK window - preventing false turn-on due to faulty switches or unresponsive microcontrollers. Its internal logic combines edge-triggered debounce (tDEBOUNCE), undervoltage detection (VTH+ = 3.4 V typ., VTH– hysteresis = 200 mV), and dual-interrupt sources (PB press or VCC dropout) routed to separate INT and PBOUT outputs.

Smart Reset™ behavior is configurable via external CSRD capacitor charging (ISRD current), defining tSRD delay before long-push recognition; RST assertion or EN deassertion depends on factory option. The device integrates a dedicated 1.5 V reference (1% accuracy, 15 µA load capability) with mandatory 1 µF bypass, active only post-reset and disabled in standby.

Key Specifications

Pinout & Package

STM6601DA2BDM6F 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 efficient heat dissipation in high-density designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM6600DA2BDM6F, the STM6601DA2BDM6F offers stricter power-on validation via tON_BLANK, improving boot reliability in deterministic systems; versus TPS3808G125DBVR, it delivers integrated push-button control, Smart Reset™, and reference - eliminating three discrete components.

Availability

STM6601DA2BDM6F is available at Aetrix Electronics and suitable for smartphone power sequencing, portable audio player control, handheld terminal boot security, and PDA system supervision requiring stable component supply across extended production lifecycles.

Supply support for STM6601DA2BDM6F 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, and control solutions for industrial, automotive, and consumer markets.

The STM6600/STM6601 product line targets ultra-low-power portable electronics requiring robust, hardware-enforced power-on sequencing, secure reset, and integrated voltage reference - reducing firmware dependency and BOM complexity.

FAQ

What is the function of the PSHOLD pin on STM6601DA2BDM6F?

The PSHOLD pin is a critical power-on confirmation input that must be driven high by the host processor within the fixed tON_BLANK window after PB press to validate successful boot. If unasserted, EN is deasserted to prevent unstable system operation. During startup, an internal pull-down ensures default low state, and during normal operation, pulling PSHOLD low forces immediate EN deassertion for controlled shutdown.

How does the CSRD capacitor affect Smart Reset™ behavior?

The CSRD capacitor sets the Smart Reset™ delay time (tSRD) by controlling the charge time to the VSRD threshold. Larger capacitance increases tSRD, extending the required PB+SR press duration before long-push recognition. With no capacitor, tSRD = 0 and long-push is detected immediately after tINT_Min expires. Ceramic capacitors with low ESR are recommended for stable timing.

Can the VREF output be left unconnected?

No - a 1 µF ceramic capacitor is mandatory on the VREF pin regardless of whether the 1.5 V reference is used in the system. This capacitor stabilizes the internal reference circuitry and prevents oscillation or inaccurate output. Omitting it risks reference instability, degraded accuracy, and potential malfunction of associated analog functions dependent on VREF.

What is the difference between EN and EN outputs?

EN is an active-high push-pull output that drives high to enable downstream power stages; EN is its active-low complement, driving low for the same functional purpose. The variant shipped (EN or EN) is factory-configured per part number - STM6601DA2BDM6F uses EN. Selection depends on external MOSFET gate drive requirements: EN simplifies N-channel high-side switching, while EN suits P-channel or inverter-based control topologies.