SI1133 Datasheet, PDF (15/43 Pages) Silicon Laboratories – UV Index/Ambient Light Sensor IC with IC Interface

Si1133 Data Sheet
User to Sensor Communication
5.3.1 Accessing the Parameter Table (PARAM_QUERY & PARAM_SET Commands)
The parameter table is written to by writing the INPUT_0 I2C register and the PARAM_SET command byte to the Command I²C regis-
ter. The format of the PARAM_SET word is such that the 6 LSBits contain the location of the target byte in the parameter table.
Example: To transfer 0xA5 to parameter table location 0b010101.
Read RESPONSE0 (address 0x11)
and store the CMMND_CTR field.
Write 0xA5 to INPUT0 (address 0x0A).
Write 0b10010101 to COMMAND (address 0x0B).
Read RESPONSE0 (address 0x11)
and check if the CMMND_CTR field incremented.
If there is no increment or error, repeat the “read the RESPONSE0” step until the CMMND_CTR has incremented. If there is an error
send a RESET or a RESET_CMD_CTR command.
The two write commands (to INPUT0 and COMMAND) can be in the same I²C transaction.
Example: To read data from the parameter table location 0b010101.
Read the RESPONSE0 (address 0x11)
and store the CMMND_CTR field.
Write 0b01010101 to the COMMAND (address 0x0B).
Read RESPONSE0 (address 0x11)
and check if the CMMND_CTR field incremented.
If there is no increment or error, repeat the “read RESPONSE0” step until the CMMND_CTR has incremented.
Read RESPONSE1 (address 0x10)
this gives the read result. If there is an error send RESET or a RESET_CMD_CTR com-
mand.
The last two read commands (from RESPONSE0 and RESPONSE1) should not be in the same I²C transaction.
5.3.2 Sensor Operation Initiation Commands
The FORCE, PAUSE, and START commands make use of the information in CHAN_LIST. Configure CHAN_LIST prior to using any of
these commands.
5.3.3 RESET_CMD_CTR Command
Resets RESPONSE0 CMMND_CTR field and does nothing else.
5.3.4 RESET Command
Resets the sensor and puts it into the same state as when powering up. The parameter table and all I²C registers are reset to their
default values.
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