CAT9532WI datasheet(10/18 Pages) ONSEMI

Part #	CAT9532WI

Description	16-bit Programmable LED Dimmer with I2C Interface

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Manufacturer	ONSEMI [ON Semiconductor]

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CAT9532

Write Operations

Data is transmitted to the CAT9532 registers using the

write sequence shown in Figure 6.

If the AI bit from the command byte is set to “1”, the

CAT9532

internal

registers

can

be

written

sequentially. After sending data to one register, the

next data byte will be sent to the next register

sequentially addressed.

Read Operations

The CAT9532 registers are read according to the

timing diagrams shown in Figure 7 and Figure 8. Data

from the register, defined by the command byte, will

be sent serially on the SDA line.

After the first byte is read, additional data bytes may

be read when the auto-increment flag, AI, is set. The

additional data byte will reflect the data read from the

next register sequentially addressed by the (B3 B2 B1

B0) bits of the command byte.

When reading Input Port Registers (Figure 8), data is

clocked into the register on the failing edge of the

acknowledge clock pulse. The transfer is stopped

when the master will not acknowledge the data byte

received and issue the STOP condition.

LED Pins Used as General Purpose I/O

Any LED pins not used to drive LEDs can be used as

general purpose input/output, GPIO.

When used as input, the user should program the

corresponding LED pin to Hi-Z (“00” for the LSx

register bits). The pin state can be read via the

Input Register according to the sequence shown in

Figure 8.

For use as output, an external pull-up resistor should

be connected to the pin. The value of the pull-up

resistor is calculated according to the DC operating

characteristics. To set the LED output high, the user

has to program the output Hi-Z writing “00” into the

corresponding LED Selector (LSx) register bits. The

output pin is set low when the LED output is

programmed low through the LSx register bits (“01” in

LSx register bits).

Figure 6. Write to Register Timing Diagram

Figure 7. Read from Register Timing Diagram

12

SCL

WRITE TO

REGISTER

DATA OUT

FROM PORT

34

5

6

7

8

SDA

A

Slave Address

Data To Register 1

Start Condition

R/W Acknowledge

From Slave

Acknowledge

From Slave

Acknowledge

From Slave

9

Command Byte

1.0

A

Data To Register 2

S

1

0

A2 A1 A0

0

tpv

A

AI B3 B2 B1 B0

A

00

0

DAT

1

S

A

0

A2 A1 A0

1

0

A2 A1 A0

1

A

COMMAND BYTE

Acknowledge

From Slave

Acknowledge

From Slave

Acknowledg

From Slave

A

P

NA

e

From Master

S

DATA

R/W

First Byte

Last Byte

No Acknowledge

From Master

1

Slave Address

Data From Register

Slave Address

MSB

LSB

MSB

LSB

0

Note:

Transfer can be stopped at any time by a STOP condition.

R/W

At This Moment Master-Transmitter

Becomes Master-receiver and

Slave-Receiver Becomes

Slave-Transmitter

Auto-increment

Register Address

If Al = 1

Doc. No. MD-9001 Rev. E

10

Characteristics subject to change without notice

Similar Part No. - CAT9532WI

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ON Semiconductor	CAT9532WI	203Kb / 17P	16-bit Programmable LED Dimmer with I2C Interface Doc. No. MD-9001 Rev. D
ON Semiconductor	CAT9532WI-T1	203Kb / 17P	16-bit Programmable LED Dimmer with I2C Interface Doc. No. MD-9001 Rev. D

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Manufacturer	Part #	Datasheet	Description
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