Description of internal registers

STCF03I

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8.15

VOUTOK_N

This bit is set by the STCF03I. It is used to protect the device, if the output is shorted. The

VOUTOK_N bit is set to HIGH at the start-up. Then a current generator of 20 mA charges

the output capacitor for 360 µs typ. and it detects when the output capacitor reaches 100

mV. If this threshold is reached the bit is set to LOW. If the output is shorted to ground or the

LED is shorted, this threshold is never reached: the bit stays HIGH, ATN pin is pulled down

and the device will not start. This bit is reset following a read operation of the STAT_REG

Figure 14.

VOUTOK_N behavior

Table 16.

Status register details

Bit Name

F_RUN

(STAT_REG)

LED_F

(STAT_REG)

NTC_W

(STAT_REG)

NTC_H

(STAT_REG)

OT_F

(STAT_REG)

VOUTOK_N

(STAT_REG)

Default value

00

0

0

0

0

NO

YES

YES

YES

YES

YES

Forces

Ready mode

when set

NO

YES

NO

YES

YES

YES

Sets ATN

LOW when

set

NO

YES

YES

YES

YES

YES

1.

YES means that the bit is set by internal signals and is reset to default by an I²C read operation of STAT_REG NO means

that the bit is set and reset by internal signals in real-time.