CAT3604

5

Doc. No. 5008, Rev. I

© 2005 by Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

s

e

n

i

L

l

o

r

t

n

o

Cs

t

u

p

t

u

O

D

E

L

2

R

T

C1

R

T

C0

R

T

C4

D

E

L3

D

E

L2

D

E

L1

D

E

L

00

0

-

-

-

N

O

00

1

-

-

N

O-

01

0

-

N

O-

-

01

1

N

O-

-

-

10

0

-

-

N

ON

O

10

1

-

N

ON

ON

O

11

0

N

ON

ON

ON

O

11

1

-

-

-

-

Table 2: LED Selection

Notes: 1 = logic high (or VIN)

0 = logic low (or GND)

- = LED output OFF

SHORT CIRCUIT DETECT/DISABLE

The unused LED channels can also be turned off by

connecting the respective LED pins to VOUT. In

which case, the corresponding LED driver is disabled

and the typical LED sink current is only about 20

µA.

When the following equation is true on any channel,

the driver turns off the LED channel:

≤ 1V (LED channel OFF)

Note: The CAT3604 is designed to drive LEDs with

forward voltage greater than 1V and is not compatible

with resistive loads.

LED CURRENT SETTING

connected between the RSET pin and ground.

Table 1 lists various LED currents and the associ-

surface mount resistors.

)

A

m

(

t

n

e

r

r

u

C

D

E

LR

T

E

S

k

(

Ω

Ω

Ω

Ω

Ω)

19

4

6

27

8

2

52

0

1

0

19

.

9

4

5

14

.

2

3

0

27

.

3

2

0

34

.

5

1

Table 1. RSET Resistor Selection

The digital control lines CTR0, CTR1 adn CTR2

allow to turn On or Off a combition of LEDs as

shown in Table 2.