ST10F272M_12 datasheet(79/176 Pages) STMICROELECTRONICS

79 / 176 page

ST10F272M

System reset

Doc ID 12968 Rev 3

79/176

Warning:

It is recommended to provide the external hardware with a

current limitation circuitry. This is necessary to avoid

permanent damage of the device during the power-on

transient, when the capacitance on V18 pin is charged. For

the on-chip voltage regulator functionality 10nF is sufficient:

In any case, a maximum of 100 nF on V18 pin should not

generate problems of over-current (higher value is allowed if

current is limited by the external hardware). External current

limitation is nevertheless also recommended to avoid risks of

damage in case of a temporary short between V18 and

ground: The internal 1.8 V drivers are sized to drive currents

of several tens of Amps, so the current must be limited by the

external hardware. The limit of current is imposed by power

dissipation considerations (refer to Section 24: Electrical

characteristics).

In figures 17 and 18 below, asynchronous power-on timing diagrams are shown, with boot

from internal or external memory respectively, highlighting the reset phase extension

introduced by the embedded Flash module when selected.

Caution:

Never power the device without keeping the RSTIN pin grounded: The device could enter

into unpredictable states, risking also permanent damage.

ST10F272M Datasheet(PDF) 79 Page - STMicroelectronics