STCF04

Description of the internal registers

Doc ID 022927 Rev 3

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9.5

Feature (FTR_REG) 04(hex)

LS_0~2: these 3 bits define the value of the internal reference voltage for the light sensor

comparator. The EN_LS bit must be set to 1 to activate the internal reference for the light

sensor comparator.

EN_LS: this bit enables the light sensor function when set HIGH.

VDC_0~1: these 2 bits define the output voltage of the DC-DC converter.

Note:

See Section 10.4.

IDC_0: this bit defines the peak current limit value of the DC-DC converter.

Table 18.

Status register details

Bit name

F_RUN

(STAT_REG)

FL_R

NTC_W

(STAT_REG)

NTC_H

(STAT_REG)

OT_F

(STAT_REG)

FL_OVR

LTH

Default value

0

0

0

0

0

0

0

NO

NO

YES

YES

YES

NO

NO

Forces Idle

mode when set

NO

NO

NO

YES

YES

NO

NO

Sets ATN LOW

when set

NO

YES

YES

YES

YES

YES

NO

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.

Table 19.

Feature register

LS_REG

(Write mode)

MSB

LSB

SUB ADD=04

IDC_0

N/A

VDC_1

VDC_0

EN_LS

LS_2

LS_1

LS_0

Power-ON, Shutdown

mode RESET value

0

0000000

Table 20.

Light sensor reference dimming register settings

LS_DIM(hex)

012

3

4

5

6

7

LSREF[mV]

200

400

600

800

1000

1200

1400

1600

Table 21.

VDC_1

VDC_0

00

4.5 V

01

5.0 V

10

5.5 V