NOA1312 Datasheet, PDF (14/16 Pages) ON Semiconductor – High-Precision Ambient Light Sensor

NOA1312
To write the DEVICE_ID_MSB value to the EEPROM,
the above sequence must be repeated substituting the MSB
register address values.
To read the DEVICE_ID_LSB value from the EEPROM,
use the following read command sequence:
1. Issue Start command
2. Issue 0x52 (lower seven bits of I²C slave address
0x29 followed by write−bit 0) – the write address
could be 0x52 (0x29), 0x72 (0x39) or 0x92 (0x49)
3. Issue 0x0A for the
EEPROM_RDWR_REG_ADDRESS register
address
4. Issue 0x18 for the EEPROM DEVICE_ID_LSB
register address to be read
5. Issue Stop command
6. Issue Start command
7. Issue 0x52 (lower seven bits of I²C slave address
0x29 followed by write−bit 0) – the write address
could be 0x52 (0x29), 0x72 (0x39) or 0x92 (0x49)
8. Issue 0x0B for the
EEPROM_CONTROL_STATUS register address
9. Issue 0x04 value to initiate an EEPROM read
operation
10. Issue Stop command.
11. Wait 3 ms for the EEPROM read operation to
complete
12. Issue Start command
13. Issue 0x52 (lower seven bits of I²C slave address
0x29 followed by write−bit 0) – the write address
could be 0x52 (0x29), 0x72 (0x39) or 0x92 (0x49)
14. Issue 0x0B for the
EEPROM_CONTROL_STATUS register address
15. Issue Start command
16. Issue 0x53 (lower seven bits of I²C slave address
0x29 followed by read−bit 1) – the read address
could be 0x53 (0x29), 0x73 (0x39) or 0x93 (0x49)
17. Read the EEPROM_CONTROL_STATUS byte
18. Issue Stop command
19. If the EEPROM_CONTROL_STATUS byte
equals 0x08 proceed to the next step, otherwise go
to step 12.
20. Issue Start command
21. Issue 0x52 (lower seven bits of I²C slave address
0x29 followed by write−bit 0) – the write address
could be 0x52 (0x29), 0x72 (0x39) or 0x92 (0x49)
22. Issue 0x18 for the EEPROM DEVICE_ID_LSB
register address
23. Issue Start command
24. Issue 0x53 (lower seven bits of I²C slave address
0x29 followed by read−bit 1) – the read address
could be 0x53 (0x29), 0x73 (0x39) or 0x93 (0x49)
25. Read the DEVICE_ID_LSB byte
26. Issue Stop command
To read the DEVICE_ID_MSB value from the EEPROM,
the above sequence must be repeated substituting the MSB
register address values.
OUTPUT_TRIM Register (0x16)
EEPROM Register Address 0x16 contains 8−bits of
output trim covering the range of 0x00 to 0xFF (0 to 255).
Table 11 shows the minimum, default and maximum trim
available.
Table 11. OUTPUT_TRIM REGISTER VALUES
Input Code
Trim Gain
0000 0000
165%
0101 1101
100%
1111 1111
63%
Changes to the trim register are reflected in real time on
the output value of the device.
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