LM3533 datasheet(32/63 Pages) TI1

32 / 63 page

SDA

Start Condition

Stop Condition

SCL

LM3533

SNOSC68C – APRIL 2012 – REVISED SEPTEMBER 2015

www.ti.com

Programming (continued)

Figure 35. Start and Stop Sequences

7.5.1.2 I2C-Compatible Address

The chip address for the LM3533 is 0110110 (36h) for the -40 device and 0111000 (38h) for the -40A device.

After the START condition, the I2C master sends the 7-bit chip address followed by an eighth read or write bit

(R/W). R/W= 0 indicates a WRITE and R/W = 1 indicates a READ. The second byte following the chip address

selects the register address to which the data is written. The third byte contains the data for the selected register.

7.5.1.3 Transferring Data

Every byte on the SDA line must be eight bits long, with the most significant bit (MSB) transferred first. Each byte

of data must be followed by an acknowledge bit (ACK). The acknowledge related clock pulse (9th clock pulse) is

generated by the master. The master releases SDA (HIGH) during the 9th clock pulse. The LM3533 pulls down

SDA during the 9th clock pulse signifying an acknowledge. An acknowledge is generated after each byte has

been received.

Table 1 lists the available registers within the LM3533.

7.6 Register Maps

7.6.1 LM3533 Register Descriptions

Table 1. LM3533 Register Definitions

Name

Address

Power On Reset

Current Sink Output Configuration 1

0x10

0x92

Current Sink Output Configuration 2

0x11

0x0F

Start Up/Shut Down Ramp Rates

0x12

0x00

Run Time Ramp Rates

0x13

0x00

Control Bank A PWM Configuration

0x14

0x38

Control Bank B PWM Configuration

0x15

0x38

Control Bank C PWM Configuration

0x16

0x38

Control Bank D PWM Configuration

0x17

0x38

Control Bank E PWM Configuration

0x18

0x38

Control Bank F PWM Configuration

0x19

0x38

Control Bank A/B Brightness Configuration

0x1A

0x00

Control Bank C Brightness Configuration

0x1B

0x00

Control Bank D Brightness Configuration

0x1C

0x00

Control Bank E Brightness Configuration

0x1D

0x00

Control Bank F Brightness Configuration

0x1E

0x00

Control Bank A Full-Scale Current

0x1F

0x13

Control Bank B Full-Scale Current

0x20

0x13

Control Bank C Full-Scale Current

0x21

0x13

Control Bank D Full-Scale Current

0x22

0x13

Control Bank E Full-Scale Current

0x23

0x13

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