MAX8930 Datasheet, PDF (18/52 Pages) Maxim Integrated Products – WLED Charge Pump, RGB, OLED Boost, LDOs with ALC and CAI

WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
Pin Description (continued)
PIN
NAME
C4
PGND3
D4
PGND1
D5
PGND2
LDO FUNCTION
A3
LDO1
Power Ground for the Step-Up Converter
Power Ground for the Charge-Pump Block
Power Ground for the Charge-Pump Block
FUNCTION
Output of LDO1. The default value is 2.6V. Bypass LDO1 to AGND with a 1FF ceramic capacitor as
close as possible to the IC.
B3
LDO2
Output of LDO2. The default value is 2.9V. Bypass LDO2 to AGND with a 1FF ceramic capacitor as
close as possible to the IC.
B2
LDO3
Output of LDO3. The default value is 1.80V. Bypass LDO3 to AGND with a minimum 2.2FF ceramic
capacitor as close as possible to the IC.
LOGIC AND ENABLE FUNCTION
D1
VDD
Logic-Supply Voltage Input. Bypass VDD to AGND with a 0.1FF ceramic capacitor as close as possible
to the IC. The input range is 1.7V to 5.5V.
D3
SDA
I²C Data Input. Data is read on the rising edge of SCL. Connect a 1.5kI resistor from SDA to VDD.
E2
SCL
I²C Clock Input. Data is read on the rising edge of SCL. Connect a 1.5kI resistor from SCL to VDD.
D2
AGND Analog Ground. Connect AGND to the system ground plane.
C3
EN
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
CAI
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.
E3
PLAYR
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.
E4
PLAYG
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.
F3
PLAYB
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.
E1
FILT
PWM Filter Capacitor. Connect a 0.1FF 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
C1
KEY
through the I²C serial interface. KEY on/off function is controlled by the I²C, ALC, or the internal 500Hz
PWM signal. Program the settings for KEY through the I²C interface.
C2
REFBP
1.20V Reference output. Bypass REFBP to AGND with 0.1FF ceramic capacitor as close as possible
to the IC. Do not load REFBP.
AUTOMATIC LUMINANCE CONTROL
F1
BIAS
Bias Output for an External Light Sensor. Bypass BIAS to AGND with a 1FF ceramic capacitor as
close as possible to the IC. The BIAS output is 3.0V.
G2
SENSE Input from Ambient Light Sensor. Connect a 5.1kI resistor from SENSE to AGND.
CHARGE-PUMP BLOCK
B5
C1P Transfer Capacitor 1 Positive Connection. Connect a 1FF ceramic capacitor from C1P to C1N.
C6
C1N Transfer Capacitor 1 Negative Connection. Connect a 1FF ceramic capacitor from C1P to C1N.
C5
C2P Transfer Capacitor 2 Positive Connection. Connect a 1FF ceramic capacitor from C2P to C2N.
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