MAX8738EVKIT Maxim Integrated Products, MAX8738EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX8738EVKIT
• Description: Display Modules & Development Tools MAX8738 KIT MAX8738 KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX8738EVKIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Do not turn on the power supplies until all connec-
tions are made:
1) Connect the 5V power supply between the VCC
2) Connect the 16.1V or higher power supply between
3) Connect the 9V power supply between the AVDD
4) Turn on all three power supplies.
5) Measure the voltage at VOUT. It should be approxi-
The MAX8738 evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX8738
programmable VCOM-adjustment solution for TFT
LCDs. On the PC board, the unbuffered VCOM adjust-
ment signal (VOUT) is available on the VOUT pad.
MAX8738 Evaluation Kit
Note: Indicate you are using the MAX8738 when contacting
these component suppliers.
2
Citizen
TDK
SUPPLIER
3 power supplies:
a) 16.1V or higher (up to 28V) at 10mA for VGON
b) 9V at 10mA for AVDD
c) 5V at 250mA for VCC
1 digital voltmeter (DVM)
and GND pads.
the VGON and GND pads.
and GND pads.
mately 3.73V.
_______________________________________________________________________________________
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847-803-6100
PHONE
Component Suppliers
Recommended Equipment
Detailed Description
www.citizencrystal.com
www.component.tdk.com
Quick Start
WEBSITE
Procedure
The EV kit is designed to output a typical VOUT voltage
between 3.48V and 3.97V (with AVDD at 9V) with 7-bit
resolution. For this, the AVDD voltage should be 9V. If a
different VOUT range is desired or if a different AVDD
voltage is used, the user may need to change R3, R4,
and R5. The pads for these resistors are designed for
standard 0805 case sizes. Refer to the Setting the
VCOM Adjustment Range section in the MAX8738 data
sheet for instructions about how to select these resistors.
Note that the VGON input voltage must be between
16.1V and 28V to supply the high voltage needed for
internal EEPROM programming.
An optical encoder (SW1) is used to send VCOM adjust-
ment commands to the MAX8738. When the user turns
the knob on the optical encoder, the on-board microcon-
troller (U2) sends an I
the MAX8738. Turning the knob clockwise decreases the
VOUT voltage, while turning the knob counterclockwise
increases the VCOM voltage. As the knob on the optical
encoder is turned, a different LED lights indicating the
direction of change of the VOUT voltage.
The momentary pushbutton switch (SW2) on the EV kit
is used to save the MAX8738’s DAC setting to its inter-
nal EEPROM. When the button is pressed, the on-board
microcontroller (U2) sends an I
(0xAA) to the MAX8738. The LEDs flash on and off
quickly, indicating that the DAC setting has been
saved.
The MAX8738 supports additional I
not supported by this EV kit such as 0x55 (reload DAC
setting from EEPROM) and 0x11 (program-specific
value of the DAC). The SDA and SCL pads on the EV kit
can be used to connect to an I
these commands (or any of the commands supported
by the MAX8738) can be transmitted.
2
C command byte (0xFF or 0x00) to
2
2
C controller where
2
C command byte
C command bytes