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SC668
Register Map (continued)
Table 22 — ALS Function Enable Bits
AD_AUTO AD_EN
Comments
0
0
0
1
ADC is disabled. Bank #1 will not change
brightness with ambient conditions.
ADC is enabled. ADC output is stored in the
AD OUT register. Bank #1 does not respond
to the AD OUT value.
AD OUT < AD RISE
AD_AUTO = 1 or 0
Bank #1 Brightness
= Value of Register 02h
1
0
ADC is disabled. Bank #1 current is set to
the start or target current. AD OUT is com-
pared to AD RISE and AD FALL registers. A new
value may be written to AD OUT via the I 2 C
interface.
AD_AUTO = 1
AD OUT < AD FALL
AD_AUTO = 0
AD OUT < AD FALL
AD_AUTO = 0
AD OUT > AD RISE
AD_AUTO = 1
AD OUT > AD RISE
1
1
ADC is enabled. Bank #1 current is set to
the start or target current. AD OUT is com-
pared to AD RISE and AD FALL registers.
Bank #1 Brightness
= Value of Register 06h
The ALS comparator functions are shown in Table 23.
Table 23 — ALS Comparator Function (1)
AD OUT > AD FALL
AD_AUTO = 1 or 0
Conditions
AD OUT Effect on Bank #1
AD OUT > AD RISE
Brightness changes to target value
Figure 29 — ADC function at Bank #1 Brightness
AD OUT < AD FALL Brightness changes to start value
AD FALL ≤ AD OUT ≤ AD RISE Brightness does not change
Hysteresis between the rising and falling
thresholds is disabled, and . . .
AD FALL → has no effect on brightness
AD O > AD RISE → brightness changes to
AD FALL ≥ AD RISE target value
AD O < AD RISE → brightness changes to
start value
AD O = AD RISE → brightness does not
change
Notes:
1) When AD_AUTO bit is high.
The state diagram of Figure 29 shows how the ADC is used
to change the brightness of backlight bank #1. No auto-
matic change in brightness occurs when AD_AUTO = 0.
ADC Output and Threshold Register (13h)
This register contains the value AD OUT which is compared
with AD RISE and AD FALL . The contents of AD OUT may originate
automatically from the ADC, when the AD_EN bit is a logic
one. Alternatively, AD OUT may be written to the register via
the I 2 C interface when the AD_EN bit is a logic zero.
When AD_EN = 1, the ADC receives its analog voltage
input signal from the external photo-detector circuit con-
nected to the ADI pin. V ADI is then converted into digital
and stored as the 8 bit word AD OUT . The reference voltage
for the ADC is provided internally by the output of LDO4
(V LDO4 ). When the voltage V ADI is equal to V LDO4 , the ADC is
at full-scale value FFh, and AD OUT will equal FFh.
When using an external photo-detection circuit, the ADC
requires the LDO output voltage V LDO4 to remain constant.
V LDO4 can drop-out if the supply voltage becomes too low.
V LDO4 should be set to a value sufficiently low to guard
against drop-out.
41
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