generator for the main LED group is powered.
ENM is pulled down to GND, disabling the main LED group. The pulse generator for the main
LED group is not powered.
for the sub LED group is powered.
ENS is pulled down to GND, disabling the sub LED group. The pulse generator for the sub
LED group is not powered.
Quick Start
Recommended Equipment
Before beginning, the follow equipment is needed:
• 2.7V to 5.5V power supply capable of delivering
500mA
Procedure
Follow the steps below to verify board operation:
1) Place shunts across pins 1-2 of JU1 and JU2 to
enable the main and sub LEDs.
2) Set the power-supply voltage between 2.7V to 5.5V.
Turn the power supply off. Do not turn on the power
supply until all connections are completed.
3) Connect the positive power-supply lead to the EV
kit pad labeled IN. Connect the power-supply
ground to the EV kit pad labeled GND.
4) Turn on the power supply. When turned on, the
LEDs are at full brightness.
5) To dim the main LEDs in 1/32nd steps, press S1
repeatedly. The main LEDs return to full brightness
after 32 button presses.
6) To dim the sub LEDs in 1/32nd steps, press S2
repeatedly. The sub LEDs return to full brightness
after 32 button presses.
Detailed Description of Hardware
Serial-Pulse Dimming
On-board pulse generators are provided to evaluate
the serial-pulse dimming feature of the MAX8630X. To
enable or disable the main or sub group of LEDs and
the corresponding pulse generator, use JU1 and JU2
(see Table 1). When first enabled, the LEDs are at full
brightness. To dim the main LEDs, press S1 repeated-
ly; for the sub LEDs, press S2 repeatedly. Dimming is
done in 32 linear steps. On the 32nd button press, the
LEDs return to full brightness.
To use external pulse generators, cut the traces short-
ing JU4 and JU5 to disconnect the on-board pulse
generators. Connect the external pulse generator to the
pads labeled ENM (main) and ENS/PWM (sub).
Using Fewer than 5 LEDs
To disable any of the LEDs, connect the square pad next
to that particular LED to the square pad labeled OUT.
Evaluating Other Versions of
the MAX8630
The MAX8630XETD25 (25mA serial-pulse dimming ver-
sion) comes installed on the MAX8630X EV kit. To eval-
uate other versions of the MAX8630X, simply replace
the IC with a part having the desired factory-pro-
grammed, full-scale output current.
To evaluate the MAX8630W_ with direct PWM dimming
control, replace U1 with the MAX8630W_, cut the
traces shorting JU4 and JU5, and install capacitor C9
(typically 0.1µF). Apply the PWM dimming signal to the
EV kit pad labeled ENS/PWM.
