L5988D datasheet(14/52 Pages) STMICROELECTRONICS

номер детали	L5988D

подробное описание детали	Pre-bias start up capability

PDF	52 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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14 / 52 page

Functional description

L5988D

14/52

DocID15324 Rev 4

The circuitry related to the UOS multifunction pin is composed of a 3 bit A/D converter and

the decoding logic. Table 6 shows the internal thresholds of each voltage window

composing the VREF magnitude. The voltage biasing of the multifunction can be set

accordingly to table Table 7.

Table 6. A/D voltage windows

UVLO

OVP

SINK

12 V BUS

LATCH

SINK

12 V BUS

LATCH

NO SINK

12 V BUS

NO LATCH

SINK

12 V BUS

NO LATCH

NO SINK

3.3 V BUS

LATCH

SINK

3.3 V BUS

LATCH

NO SINK

3.3 V BUS

NO LATCH

SINK

3.3 V BUS

NO LATCH

NO SINK

Table 7. UOS voltage biasing

R1 (k

)R2 (k)VOUS (V)

UVLO

OVP

SINK

N.C.

1.8

12 V BUS

LATCH

SINK

0.68

2.7

1.438

12 V BUS

LATCH

NO SINK

1.2

2.7

1.246

12 V BUS

NO LATCH

SINK

2.7

1.034

12 V BUS

NO LATCH

NO SINK

3.3

2.7

0.810

3.3 V BUS

LATCH

SINK

6.2

2.7

0.546

3.3 V BUS

LATCH

NO SINK

2.7

0.355

3.3 V BUS

NO LATCH

SINK

N.C.

3.3 V BUS

NO LATCH

NO SINK

1.8 V

1.575 V

1.35 V

1.125 V

0.9 V

0.675 V

0.45 V

0.225 V

0 V

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