DocID024660 Rev 6

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STCC5011, STCC5021

Application information

37

FAULT functionality

The FAULT open drain active low output is asserted during overcurrent or overtemperature

conditions. Signal is asserted until the fault is removed.

For overcurrent conditions, the STCC50x1 device is designed to eliminate false FAULT

reporting, by using an internal deglitch delay (9 ms typ.).

In the case of overtemperature, there is no deglitch delay and the FAULT signal is asserted

immediately. It is deasserted with delay after the device has cooled down and begins to turn

on. This unidirectional glitch immunity prevents FAULT oscillation during an

overtemperature event.

In the case of fault condition, the host may disable the power switch by toggling EN input to

logic low (see Figure 10).

Current limit programming

Current limit can be adjusted by an external resistor in the range 500 mA to 2.8 A (typ.). The

programming resistor may be calculated using Equation 1 to Equation 3:

Equation 1

Equation 2

Equation 3

Equation 2 and Equation 3 allow the minimum and maximum variation to be estimated

Equation 2 and Equation 3 do not take into consideration external resistor variations.

5.8

EN functionality

The enable input (EN, active high) serves to turn off the STCC50x1 device and achieve the

lowest current consumption.

The behavior of the STCC50x1 device in disabled state (EN = 0) is as follows:

•

Power switch, USB data switch and emulation profiles are turned off

•

The FAULT and CHARGING/ATTACH flags are cleared (the FAULT and

CHARGING/ATTACH outputs are set to Hi-Z mode)

•

If ATTACH_EN = 0, permanent output discharge is turned on

•

If ATTACH_EN = 1, the device turns into the attach detection mode.

()

48000

----------------

=

mA k

Ω

,

()

()

48000

1.037

--------------------------

=

mA k

Ω

,

()

()

48000

0.962

--------------------------

=

mA k

Ω

,

()