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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
Pin Description (continued)
PIN
NAME
FUNCTION
LDO FUNCTION
A3
B3
B2
LDO1
LDO2
LDO3
Output of LDO1. The default value is 2.6V. Bypass LDO1 to AGND with a 1 F F ceramic capacitor as
close as possible to the IC.
Output of LDO2. The default value is 2.9V. Bypass LDO2 to AGND with a 1 F F ceramic capacitor as
close as possible to the IC.
Output of LDO3. The default value is 1.80V. Bypass LDO3 to AGND with a minimum 2.2 F F ceramic
capacitor as close as possible to the IC.
LOGIC AND ENABLE FUNCTION
D1
D3
E2
D2
C3
V DD
SDA
SCL
AGND
EN
Logic-Supply Voltage Input. Bypass V DD to AGND with a 0.1 F F ceramic capacitor as close as possible
to the IC. The input range is 1.7V to 5.5V.
I 2 C Data Input. Data is read on the rising edge of SCL. Connect a 1.5k I resistor from SDA to V DD .
I 2 C Clock Input. Data is read on the rising edge of SCL. Connect a 1.5k I resistor from SCL to V DD .
Analog Ground. Connect AGND to the system ground plane.
Hardware Enable Input for the IC. Drive EN high to activate the IC. Drive EN low to disable the IC.
WLED AND RGB DIMMING RELATED FUNCTION
Brightness Control Input by Contents Adaptive Interface (DPWM signal). CAI varies the brightness of
F2
E3
E4
F3
E1
C1
C2
CAI
PLAYR
PLAYG
PLAYB
FILT
KEY
REFBP
main WLEDs from 0% to 100%. The dimming frequency is typically 200Hz. When CAI is used as the
main control method for main white LEDs, the ramp-up/ramp-down is automatically disabled.
On/Off Input for the Red LED Current Regulator. The PLAYR signal can be either active high or active
low. Program either active high or active low through the 20h register.
On/Off Input for the Green LED Current Regulator. The PLAYG signal can be either active high or
active low. Program either active high or active low through the 20h register.
On/Off Input for the Blue LED Current Regulator. The PLAYB signal can be either active high or active
low. Program either active high or active low through the 20h register.
PWM Filter Capacitor. Connect a 0.1 F F ceramic capacitor between FILT and AGND as close as
possible to FILT.
Key Backlight Control Output. Two threshold values for ON/OFF are available and programmable
through the I 2 C serial interface. KEY on/off function is controlled by the I 2 C, ALC, or the internal 500Hz
PWM signal. Program the settings for KEY through the I 2 C interface.
1.20V Reference output. Bypass REFBP to AGND with 0.1 F F ceramic capacitor as close as possible
to the IC. Do not load REFBP.
AUTOMATIC LUMINANCE CONTROL
F1
G2
BIAS
SENSE
Bias Output for an External Light Sensor. Bypass BIAS to AGND with a 1 F F ceramic capacitor as
close as possible to the IC. The BIAS output is 3.0V.
Input from Ambient Light Sensor. Connect a 5.1k I resistor from SENSE to AGND.
CHARGE-PUMP BLOCK
18
B5
C6
C5
C7
D6
C1P
C1N
C2P
NEG
C2N
Transfer Capacitor 1 Positive Connection. Connect a 1 F F ceramic capacitor from C1P to C1N.
Transfer Capacitor 1 Negative Connection. Connect a 1 F F ceramic capacitor from C1P to C1N.
Transfer Capacitor 2 Positive Connection. Connect a 1 F F ceramic capacitor from C2P to C2N.
Charge-Pump Negative Output. Connect a 1 F F to 2.2 F F ceramic capacitor from NEG to PGND1. In
shutdown, an internal 10k I resistor pulls NEG to PGND.
Transfer Capacitor 2 Negative Connection. Connect a 1 F F ceramic capacitor from C2P to C2N.
Maxim Integrated
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