STM6524:Dual push-button Smart Reset

The Smart Reset™ devices provide a useful feature that ensures inadvertent short reset push-button closures do not cause system resets. This is done by implementing extended Smart Reset™ input delay time (tSRC) and combined push-button inputs, which together ensures a safe reset and eliminates the need for a specific dedicated reset button.

This reset configuration provides versatility and allows the application to distinguish between a software generated interrupt and a hard system reset. When the input push-buttons are connected to microcontroller interrupt inputs, and are closed for a short time, the processor can only be interrupted. If the system still does not respond properly, continuing to keep the push-buttons closed for the extended setup time tSRCcauses a hard reset of the processor through the reset output.

The STM6524 has two combined delayed Smart Reset™ inputs (SR0,SR1) with preset delayed Smart Reset™ setup time (tSRC). The reset output is asserted after both of the Smart Reset™ inputs were held active for the selected tSRCdelay time. Depending on selected option theRSToutput remains asserted either until at least oneSRinput goes to inactive logic level (i.e. neither fixed nor minimum reset pulse width is set) or the output reset pulse duration is fixed for tREC(i.e. factory-programmed). The reset output,RST, is active low or active high, push-pull or open drain with optional pull-up resistor. The device fully operates over a broad VCCrange 1.65 V to 5.5 V. Below 1.575 V typ. the inputs are ignored and outputs are deasserted; the deasserted reset output levels are then valid down to 1.0 V.

Key Features

  • Operating voltage 1.65 V to 5.5 V
  • Low supply current 1.5 μA
  • Integrated test mode
  • Dual Smart Reset™ push-button inputs with fixed extended reset setup delay (tSRC ) from 0.5 s to 10 s in 0.5 s steps (typ.), option with internal pull-up resistor
  • Push-button controlled reset pulse duration
    • Option 1: fully push-button controlled, no fixed or minimum pulse width guaranteed
    • Option 2: defined output reset pulse duration (tREC ), factory-programmed
  • No power-on reset
  • Single reset output
    • Active low or active high
    • Push-pull or open drain with optional pull-up resistor
  • Fixed Smart Reset™ input logic voltage levels
  • Operating temperature: –40 C to +85 C
  • UDFN6 package: 1.6 mm x 1.3 mm
  • ECOPACK® 2 (RoHS compliant, Halogen-Free)
Product Specifications
DescriptionVersionSize
DS8698: 6-pin Smart Reset™3.0268 KB
Technical Notes & Articles
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TN0941: Reset and supervisor ICs: frequently asked questions (FAQ)1.0328 KB
Presentations
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Health and Wellness Mobility Cloud computing1 MB
ST offering in Wearable - Analog and Mixed Signal Portfolio3.01 MB
Flyers
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Resets and supervisors - portfolio overview1.01 MB
Smart Reset ICs dual push-button1.0767 KB
Brochures
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ST’s solutions for mobile devices3.23 MB
Sample & Buy
Part NumberPackagePacking TypeReset pulse width (mS) (min)Reset pulse width (mS) (max)Operating Temperature (°C) (min)Unit Price (US$) *QuantityOperating Temperature (°C) (max)ECCN (EU)ECCN (US)Country of Origin
STM6524AHARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
STM6524AUARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99CHINA
STM6524ALARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
STM6524AUABDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel240480-400.3100085NECEAR99CHINA
STM6524ALABDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel240480-400.3100085NECEAR99MALAYSIA
STM6524APARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40Tape And Reel1.28360-400.3100085NECEAR99MALAYSIA
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
STM6524AHARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
STM6524AUARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
STM6524ALARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3
STM6524AUABDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3md_a0gl-wspc-udfn-6l-wspc-1.3x1.6-wspc-x0.55-wspc-pitch-wspc-0.40_aya4u6baabu-wspc-(sr2uabu)_a_ver2_signed.pdf
md_a0gl-wspc-udfn-6l-wspc-1.3x1.6-wspc-x0.55-wspc-pitch-wspc-0.40_aya4u6baabu-wspc-(sr2uabu)_a_ver2.xml
STM6524ALABDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2_signed.pdf
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2.xml
STM6524APARDL6FUDFN-6L 1.3X1.6 X0.55,PITCH 0.40IndustrialEcopack3md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4-wspc-u6baarp.pdf
md_a4-wspc-udfn-6l-wspc-1.xml
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md_a0gl-wspc-udfn-6l-wspc-1.3x1.6-wspc-x0.55-wspc-pitch-wspc-0.40_aya4u6baabu-wspc-(sr2uabu)_a_ver2.xml STM6524
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2_signed.pdf STM6524
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4u6baabl-wspc-(sr2labu)-wspc-ver2.xml STM6524
md_a4-wspc-udfn-6l-wspc-1.3x1.6x0.55-wspc-pitch-wspc-0.40_aya4-wspc-u6baarp.pdf STM6524
md_a4-wspc-udfn-6l-wspc-1.xml STM6524