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NCP5021
The PHTT bit is reserved for ON Semiconductor test purposes and shall not be asserted High by the end user outside the
ON Semiconductor final test facilities. When the PHTT is asserted High, the I ? LED jumps instantaneously from the
previous level to the end value.
Phot Sense AMBS
I ? LED maximum
I ? LED minimum
PHTIM
16ms to 7500ms
PHTIM
16ms to 7500ms
Figure 13. Basic Photo Sense Timing
The rise and fall time of the I ? LED current are
programmable (according to the PHTIM register contain)
and identical. The timing is defined by the PHTIM[B4:B0]
bits multiplied by the number of steps necessary to reduce
/ increase the I ? LED form one value to the next limit.
Table 15. PHMIM[0..7]
On the other hand, the I ? LED cannot be reduce to zero
during the Photo sense operation: the contain of the
PHMIN[B2:B0] register limits the low end current when
the photo sensor is in a dark environment.
B7
0
B6
0
B5
0
B4
0
B3
PHM4
B2
PHM3
B1
PHM2
B0
PHM1
RESET
0
0
0
0
0
0
0
0
Bits [B7:B4] : RFU
Bits [B3:B0] : set up the I ? LED minimum value, according to the logarithmic table.
ILED Max
(25 mA, programmable)
Ambient Light
Gradual Dimming:
Photo sense
de ? activated
I ? setup
ILED Min
(Programmable)
Photo Sense
The photo sense register is loaded with the I2C content
Ambient Light < I2C ILED:
the Photo sense controls the ILED
The Photo Sense cannot force the
ILED below the pre ? programmed minimum level
The Photo Sense controls ILED within the Imin and I ? setup limits
When a Downward Gradual Dimming is engaged, the ILED is reduced from the level
defined by the Photo sense to the lower value defined by the gradual dimming register containt.
Figure 14. Basic Gradual Dimming and Photo Sense Operation Strategy
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