Description of internal registers

STCF03

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8.15

VOUTOK_N

This bit is set by the STCF03. 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 20mA 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 13.

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.

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