SI1133 datasheet(11/43 Pages) SILABS

Nome de Peças	SI1133

Descrição Electrónicos	UV Index/Ambient Light Sensor IC with IC Interface

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Fabricante Electrônico	SILABS [Silicon Laboratories]

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5. User to Sensor Communication

5.1 Basic I2C Operation

I2C operation is dependent on serial I2C reads and writes to an addressable bank of memory referred to as I2C space. The diagram

below outlines the registers used, some functionality and the direction of data flow. The I2C address is initially fixed but can be program-

med to a new value. This new value is volatile and reverts to the old value on hardware or software reset. Only 7-bit I2C addressing is

supported; 10-bit I2C addressing is not supported. The Si1133 responds to the I2C address of 0x55 or to an alternate address of 0x52.

SDA

SCL

SDA

Engine

PART ID

MFR ID

REV ID

MCU

INPUT3 -> 0

COMMAND

RESPONSE_1

OUTPUT0 to 25

AND

OR

INT

6

IRQ_EN

IRQ_STATUS

RESPONSE_0

Bit7: RUNNING

INFO_0 & 1 (SPARES)

CR

Sequencial Write Group

Sequencial Read Group

Part and Version ID Group

COMMAND_WR_INT

Interrupt

Logic

OD

Bit6: SUSPEND

SFR

SPACE

5

I2C

SPACE

Bit5: SLEEP

Figure 5.1. I2C Interface Block Diagram

Si1133 Data Sheet

User to Sensor Communication

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