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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
KEY (Keypad Backlight) ON/OFF
Control Operation
The keypad lighting is controlled by 3 methods, which
are all exclusive of each other.
These are:
? ALC
? PWM
? I 2 C command
If KBALC (bit 1 of 00h) is set to 1, then ALC for keypad
is ON, otherwise, it is off.
If KYPWM (bit 0 of 03h) is set to 1, PWM for keypad is
ON, otherwise, it is off.
If KYI2C (bit 5 of 02h) is set to 1, I 2 C for keypad is ON,
The ambient light level at which the key backlight is
turned off can be set in register 0Fh. The default ambi-
ent light is Ah. There is also a programmable hysteresis
level, accessed through I 2 C in the 0Fh register. The
default hysteresis width is 3h. See Figure 7.
There is a built in PWM that has a 500Hz operation fre-
quency. The dimming can be adjusted by duty ratio (set
KYDT_ bit in register 0Eh).
The KEY output is simply a 1 bit value representing ON
or OFF function.
Keypad Backlight ON/OFF Operation by ALC
To link the keypad backlight ON/OFF control to the ALC,
the register bit, KBALC, at register 00h, should be set to
1 (see Table 5).
otherwise, it is off.
KEYPAD ON/OFF
KEYPAD ON
3h LEVEL
(HYSTERESIS TO BE ON)
KEYPAD OFF
Ah LEVEL (THRESHOLD TO BE OFF)
Figure 7. KEY On/Off Hysteresis
Table 5. Keypad Backlight On/Off by ALC
BRIGHTNESS LEVEL
ALCEN
0
0
1
1
KBALC
0
1
0
1
MAIN WLEDs IN ALC MODE
No
Yes
Yes
ALC BLOCK
OFF
ON
ON
KEY BACKLIGHT
OFF
ON/OFF by I 2 C or PWM*
ON/OFF by I 2 C or PWM**
ON/OFF depends on ALC data level***
* The ALC block is disabled in this mode. In this condition, keypad backlight is activated and controlled by either internal PWM
operation (500Hz) or I 2 C.
** The ALC block is enabled in this mode. However KBALC bit is still set to 0. Therefore, the on/off control should be either I 2 C or
internal 500Hz PWM.
*** The ALC block is enabled in this mode. ALC has priority over both internal PWM and I 2 C in case KBALC bit is set to 1. This
means that the activation of the key backlight depends on the preprogrammed on/off threshold and hysteresis width.
Maxim Integrated
29
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