CS1112

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5

PACKAGE PIN DESCRIPTION (continued)

PACKAGE PIN #

FUNCTION

PIN SYMBOL

24 Lead SOIC

FUNCTION

PIN SYMBOL

15

OUT2

Open drain output three.

16

IN2

Parallel input three.

21

IN3

Parallel input four.

22

OUT3

Open drain output four.

23

STATUS

Open drain output, which is asserted when an open load or

overcurrent condition occurs at any of the outputs.

24

82 k

Ω resistor tied to ground to set up accurate internal cur-

rent sources.

CIRCUIT DESCRIPTION

Typical Operation

Control of the CS1112 can be done using the Serial

Peripheral Interface (SPI) port using the Data Input

information in Table 1, or the outputs can be controlled via

the parallel inputs (IN0, IN1, IN2, IN3). IN0 controls OUT0,

IN1 controls OUT1, IN2 controls OUT2, and IN3 controls

OUT3. Turning the output drivers on is an OR function with

the SPI input and the parallel inputs.

must be above the Power on Reset threshold (3.5 V) before

OUT0

OUT1

OUT2

OUT3

Time

SI

SCLK

CS

Don’t Care

TIMING DIAGRAM

Table 1. SPI Inputs

D7

D6

D5

D4

D3

D2

D1

D0

X

X

X

X

OUT3

OUT2

OUT1

OUT0

MSB

LSB

X = Don’t Care; MSB is Transferred first.