stcf03i STMicroelectronics, stcf03i Datasheet - Page 24

• Manufacturer Part Number: stcf03i
• Description: High Power White Led Driver With I2ctm Interface
• Manufacturer: STMicroelectronics

8.15
Figure 13. VOUTOK_N behavior
Table 16. Status register details
1. YES means that the bit is set by internal signals and is reset to default by an I
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Default value
Ready mode
Latched
LOW when
Bit Name
Sets ATN
when set
that the bit is set and reset by internal signals in real-time.
Forces
set
(1)
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
(STAT_REG)
F_RUN
NO
NO
NO
0
(STAT_REG)
LED_F
YES
YES
YES
0
(STAT_REG)
NTC_W
YES
YES
NO
0
(STAT_REG)
NTC_H
YES
YES
YES
2
0
C read operation of STAT_REG NO means
(STAT_REG)
OT_F
YES
YES
YES
0
(STAT_REG)
VOUTOK_N
YES
YES
YES
0