STM660x push-button on/off controllers
The STM660x ICs provide safe, reliable on/off control for embedded applications using one or two pushbuttons, handling power-up sequencing, power-down, processor reset, and recovery from unresponsive software in a single device.
Features and integration
The STM6600 and STM6601 protect battery-operated devices against incomplete power-up sequences. The devices prevent startup if the battery lacks sufficient energy to complete the sequence, avoiding system damage that can result from an interrupted power-up, and block power-up if a fault is detected on the supply.
The STM660x also implements Smart Reset to recover products that have crashed or frozen during normal operation. Smart Reset requires both pushbuttons to be held simultaneously for a minimum period (set by an external capacitor) before a reset is issued. This two-action sequence eliminates the need to recess the reset button behind a hole in the outer casing, reducing enclosure engineering costs and allowing the casing to be fully sealed where required.
The integration level of the STM660x replaces up to 30–40 discrete components, or alternatively a CPLD with a dedicated voltage regulator, clock, and voltage detector, or a microcontroller-based housekeeping solution requiring an external crystal, voltage detector, and custom firmware.
The 2 × 3 mm package occupies less than half the PCB area of comparable discrete implementations. Active current consumption is 6 µA, with a shutdown mode below 1 µA.
Applications
- The STM660x is suited for battery-powered and portable applications including:
- IoT and smart devices requiring efficient power on/off control
- Consumer electronics and handheld devices
- Portable medical and industrial equipment
- Telecom and networking equipment
Benefits
- Safe power-up sequencing prevents startup with insufficient battery energy
- Fault-protected power-up blocks power-on if a supply fault is detected
- Smart Reset via simultaneous dual-button hold eliminates hidden or recessed reset buttons
- Crash recovery without external reset hardware
- Up to 30–40 discrete components replaced in a single 2 × 3 mm package
- Ultralow quiescent current: 6 µA active, <1 µA shutdown