AN3261

Typical application diagrams

Doc ID 17837 Rev 1

5/17

2

Typical application diagrams

The STM65xx family of Smart Reset™ products provides a broad variety of options for

various types of applications.

2.1

Single-button reset

The STM65xx devices allow for different reset input configurations. In simple applications,

only one input reset button with delayed reset may be sufficient. In this case, for product

options without internal input pull-up resistors, SR0 and SR1 can be either connected

together or the unused SR input permanently grounded. In the case of a product version

with internal input pull-up resistors, just connect the inputs together. Permanent grounding

of the unused SR input would, in this case, cause a continuous current to flow through the

Figure 1.

Single-button Smart Reset™ typical application diagram, with “early-

warning” feature, STM6503

1.

Early warning feature: the input reset push-button can be also used as an early warning to the processor

SR0

TSR

SR1

RST

VSS

VCC

INT/

NMI

VSS

PUSH-BUTTON

SWITCH

MCU

RESET

STM6503

VCC

VCC

Early

warning