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NCP5890
When the photo sense returns a lower ambient light level
in comparison to the maximum level set up by the user, the
I ? LED decreases with a timing defined by an I2C
$0A PHTIM[0..5]
command. Such a timing is derived from the Low
Frequency clock and selected by the PHTIM register (see
Figure 14).
B7
?
B6
?
B5
PHT6
B4
PHT5
B3
PHT4
B2
PHT3
B1
PHT2
B0
PHT1
RESET
0
0
0
0
0
0
0
0
Bits [B7] : RFU
Bits [B6] : RFU
Bits[B5:B0] :
PHT1 = T = 50 ms/step
PHT2 = T = 100 ms/step
PHT3 = T = 200 ms/step
PHT4 = T = 400 ms/step
PHT5 = T = 800 ms/step
PHT6 = T = 1600 ms/step
Note: the bits cannot be combined to generate a different timing.
In addition, the positive and negative slopes of the I-LED current are intentionally different. In order to generate a smooth
transition of the backlight from maximum toward the minimum calculated by the photo sense, the timing of the negative
going slope is twice the timing of the positive going slope.
Phot Sense AMBS
I ? LED maximum
I ? LED minimum
PHTIM
16ms to 7500ms
PHTIM
16ms to 7500ms
Figure 14. Basic Photo Sense Timing
The rise and fall time of the I ? LED current are
programmable (according to the PHTIM register contain).
The timing is defined by the PHTIM[B5:B0] bits
multiplied by the number of steps necessary to reduce /
increase the I ? LED form one value to the next limit.
$09 PHMIN[0..7]
On the other hand, the I ? LED cannot be reduce to zero
during the Photo sense operation: the contain of the
PHMIN[B3:B0] register limits the low end current when
the photo sensor is in a dark environment.
B7
B6
B5
B4
B3
B2
B1
B0
step
RESET
?
0
?
0
?
0
?
0
PHM4
0
PHM3
0
PHM2
0
PHM1
0
Bits [B7:B4] : RFU
Bits[B3:B0] : set up the I ? LED minimum value, according to the exponential table.
http://onsemi.com
14
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