STM6520 datasheet(7/23 Pages) STMICROELECTRONICS

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STM6520

Pin descriptions

Doc ID 15953 Rev 5

7/23

Pin descriptions

3.1

Power supply (VCC)

This pin is used to provide power to the Smart Reset™ device. A 0.1 µF ceramic decoupling

capacitor is recommended to be connected between the VCC and VSS pins, as close to the

STM6520 device as possible.

3.2

Ground (VSS)

This is the ground pin for the device.

3.3

Smart Reset™ inputs (SR0, SR1)

Push-button Smart Reset™ inputs, active-low. Both inputs need to be asserted

simultaneously for at least tSRC to activate the reset outputs.

3.4

User-selectable Smart Reset™ delay (DSR)

An input that allows the user to program the setup time (tSRC) for which both the push-

buttons need to be pressed to activate the reset outputs. Controlled by different voltage

levels on the DSR pin: when connected to ground, tSRC = 7.5 s, when connected to VCC,

tSRC = 12.5 s (typ.). DSR is a DC-type input, intended to be either permanently grounded or

permanently connected to VCC.

3.5

Reset outputs (RST1, RST2)

RST1 is active-low, open-drain, RST2 active-high, push-pull. Neither fixed nor minimum

output reset pulse duration, nor power-on reset is implemented. Releasing any of the push-

buttons while reset outputs are active, causes both outputs to deassert.

Figure 3.

Block diagram

tSRC selector

two-state logic

DSR

RST2

RST1

Oscillator

Output

logic

SR0

SR1

tSRC

AM00436V2

Smart ResetTM

reset logic

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