MLX75030 Datasheet, PDF (39/72 Pages) Melexis Microelectronic Systems – Universal ActiveLight Sensor Interface

MLX75030 Universal ActiveLight Sensor Interface
Datasheet
If all possible measurements are selected, the Output Data Frame is defined in the table below:
Data Byte Number
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Byte 10
Byte 11
Byte 12
Byte 13
Byte 14
Byte 15
Byte 16
Data Byte Contents after SD command
ADCtest0 (8 MSB)
ADCtest0 (8 LSB)
ADCtest1 (8 MSB)
ADCtest1 (8 LSB)
ADCtest2 (8 MSB)
ADCtest2 (8 LSB)
ADCtest3 (8 MSB)
ADCtest3 (8 LSB)
ADCtest4 (8 MSB)
ADCtest4 (8 LSB)
DAC-ADC Test (8 MSB)
DAC-ADC Test (8 LSB)
00000 + CD_x Ambient Diodes Detection (3 bit)
CRC (8 bit)
Comments
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₆
Depends on M₅
Depends on M₅
Depends on M₄
Output always
Table 20 : SD Output Data Frame
When certain measurements are disabled, the corresponding data bytes are omitted from the Output Data Frame.
ADCtest0/1/2/3/4
These measurements are AD conversions of some internal reference voltages:
ADCtest0 is typically at 1/16 of the ADC range: ADCtest0 = 0x0E00 .. 0x1200.
ADCtest1 is typically at 1/4=4/16 of the ADC range: ADCtest1 = 0x3E00 .. 0x4200.
ADCtest2 is typically at 3/4=12/16 of the ADC range: ADCtest2 = 0xBE00 .. 0xC200.
ADCtest3 is typically at 15/16 of the ADC range: ADCtest3 = 0xEE00 .. 0xF200.
ADCtest4 is similar to ADCtest0/1/2/3: an AD conversion of an internal reference voltage is made. However, an independent
voltage reference is used as input for the ADC in case of ADCtest4. In the case of ADCtest0/1/2/3, the reference voltages are
generated from the references used for the ADC.
The typical output for ADCtest4 will be as listed in below table:
ADCtest4 values
min
typ
max
@ Vs=3.0V 33400
35400
37400
LSB
@ Vs=3.3V 30400
32400
34400
LSB
@ Vs=3.6V 27400
29400
31400
LSB
DAC-ADC test
A DAC-ADC test measurement is performed in the following way: the DAC output is connected to the ADC input. The DAC
input will be DACA<7:0> from register 'SetAH'. This DAC-input will be converted to an analog output voltage that will be
converted again by the ADC to give a digital value. This digital value is given in the bytes DAC-ADC Test.
Ambient Diodes Detection
During the Diagnostics measurement, the status of the external photo diodes connected to the ambient light channel inputs
is checked.
Three bits CDx are output: when the bit C is set high, an error on the photo diode channel C is present.
In a similar way, bit D indicate if errors on ambient light channels D is present or not.
REVISION 005 – DECEMBER 2013
3901075030
PAGE 39 OF 72