STNS01 datasheet(21/29 Pages) STMICROELECTRONICS

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STNS01

Operation description

8.6

Battery discharge overcurrent protection

When the STNS01 is powered from the BAT pin, a discharge overcurrent protection circuit

disables the device if the battery current exceeds I

BATOCP

for more than t

DOD

. A valid input

voltage (V

) must be connected to restore normal operating conditions.

8.7

Input overcurrent protection

When the STNS01 is powered from the IN pin, a current limitation circuit prevents the input

current from increasing up to potentially destructive values. When V

SYS

is lower than

ILIMSCTH

, the input current is limited to I

INLIMSC

in order to have reduced power dissipation

in short-circuit conditions. As soon as V

SYS

increases over V

ILIMSCTH

, the current limitation

value is increased to I

INLIM

8.8

SYS and LDO short-circuit protection

In case of an abrupt short-circuit on SYS or LDO, the STNS01 is immediately turned off (no

deglitch). This short-circuit protection intervenes when the SYS voltage drops below V

SCSYS

or the LDO output voltage drops below V

SCLDO

8.9

IN overvoltage protection

The STNS01 is normally powered from the battery when V

> V

INOVP

while it is powered

from the IN pin when V

UVLO

< V

INOVP

. In the latter case, if the input voltage temporarily

increases over V

INOVP

due to a poorly regulated power supply, the STNS01 switches to

battery power to protect any external circuit connected to SYS.

If the input voltage (V

) returns into the normal range, the device's supply voltage is

switched back to the IN pin.

8.10

Shutdown mode

A high level on the shutdown digital input pin (SD) when no valid input voltage is connected

makes the device enter shutdown (low power) mode. Battery drain is then reduced to less

than 500 nA. The exit conditions for the shutdown mode are the same as for the

overdischarge state (valid V

connected and V

BAT

> V

ODCR

8.11

Thermal shutdown

The STNS01 is protected against overheating which might be generated by the combination

of ambient temperature and internal heating due to power dissipation. When the die

temperature exceeds T

the device is turned off.

In order to restore normal operation the input voltage (V

) must be disconnected and re-

connected.

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