STM6513 datasheet(8/29 Pages) STMICROELECTRONICS

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Pin descriptions

STM6513

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Doc ID 16490 Rev 2

Pin descriptions

3.1

Power supply (VCC)

This pin is used to provide the power to the Smart Reset device and to monitor the power

supply. A 0.1 µF decoupling ceramic capacitor is recommended to be connected between

VCC and VSS pins.

3.2

Ground (VSS)

This is the ground for the device and all supplies.

3.3

Smart Reset inputs (SR0, SR1)

Push-button Smart Reset inputs. Both inputs need to be held active at the same time for at

least tSRC to activate the reset outputs. When only one Smart Reset input is used, connect

the unused one permanently to VSS.

3.4

User-programmable Smart Reset delay (TSR pin)

Used to allow the user to program the setup time before the push-buttons action is validated

by reset output. Controlled by different voltage levels on the TSR pin: when connected to

ground, tSRC = 2 s; when left open, tSRC = 6 s; when connected to VCC, tSRC = 10 s

(all times are minimum). TSR is a DC-type input, intended to be either permanently

grounded, permanently connected to VCC or permanently left open. If left open, for improved

system glitch immunity it is strongly recommended to connect a 0.1 µF decoupling ceramic

capacitor between the TSR and VSS pins.

3.5

Reset outputs (RST1, RST2)

Reset outputs, RST1 active-high, push-pull type, RST2 active-low, open-drain.

3.6

Adjustable output reset timeout period input pin (TRECADJ)

The output reset timeout period (tREC1) on RST1 is adjustable by connecting an external

capacitor CtREC to the TRECADJ pin. Calculated tREC and CtREC examples are given in

Table 2. Refer also to Table 5.

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