NOA3302 Datasheet, PDF (15/23 Pages) ON Semiconductor – Digital Proximity Sensor

NOA3302
PS_INTERVAL Register (0x16)
The PS_INTERVAL register sets the wait time between
consecutive proximity measurements in PS_Repeat mode.
The register is binary weighted times 5 in milliseconds with
the special case that the register value 0x00 specifies 5 ms.
The range is therefore 5 ms to 1.28 s. The default startup
value is 0x0A (50 ms).
Table 15. PS_INTERVAL REGISTER (0x16)
Bit
7
6
5
4
3
2
1
0
Field
interval
Field
Interval
Bit
Default
7:0
0x0A
0x01 to 0xFF
Description
Interval time between measurement cycles. Binary weighted value
times 5 ms plus a 5 ms offset.
PS_CONTROL Register (0x17)
The PS_CONTROL register is used to control the
functional mode and commencement of proximity sensor
measurements. The proximity sensor can be operated in
either a single shot mode or consecutive measurements
taken at programmable intervals.
Table 16. PS_CONTROL REGISTER (0x17)
Bit
7
6
5
4
Field
NA
Both single shot and repeat modes consume a minimum
of power by immediately turning off LED driver and sensor
circuitry after each measurement. In both cases the quiescent
current is less than the IDD_STBY parameter. These automatic
power management features eliminate the need for power
down pins or special power down instructions.
3
2
1
0
PS_Repeat PS_OneShot
Field
NA
PS_Repeat
PS_OneShot
Bit
Default
Description
7:2
XXXXXX Don’t care
1
0
Initiates new measurements at PS_Interval rates
0
0
Triggers proximity sensing measurement. In single shot mode this bit clears
itself after cycle completion.
ALS_TH Registers (0x20 – 0x23)
With hysteresis not enabled (see ALS_CONFIG register),
the ALS_TH registers set the upper and lower interrupt
thresholds of the ambient light detection window. Interrupt
functions compare these threshold values to data from the
ALS_DATA registers. Measured ALS_DATA values
outside this window will set an interrupt according to the
INT_CONFIG register settings.
With hysteresis enabled, threshold settings take on a
different meaning. If the ALS_hyst_trig is set, the
ALS_TH_UP register sets the upper threshold at which an
interrupt will be set, while the ALS_TH_LO register then
sets the lower threshold hysteresis value where the interrupt
would be cleared. Setting the ALS_hyst_trig low reverses
the function such that the ALS_TH_LO register sets the
lower threshold at which an interrupt will be set and the
ALS_TH_UP represents the hysteresis value at which the
interrupt would be subsequently cleared. Hysteresis
functions only apply in “auto_clear” INT_CONFIG mode.
Table 17. ALS_TH_UP REGISTERS (0x20 – 0x21)
Bit
7
6
5
4
3
2
1
0
Field
ALS_TH_UP_MSB(0x20), ALS_TH_UP_LSB(0x21)
Field
ALS_TH_UP_MSB
ALS_TH_UP_LSB
Bit
Default
Description
7:0
0xFF
Upper threshold for ALS detection, MSB
7:0
0xFF
Upper threshold for ALS detection, LSB
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