Datasheet

Simple I
2
C/SMBus Commands
There are two methods for communicating with the
MAX17065: through the normal user-interface panel
(Figure 2) or through the I
2
C/SMBus commands, avail-
able by selecting the Interface Diagnostic Window
menu item from the Action menu bar. The Maxim
Command Module Interface window pops up and
includes a 2-wire interface tab that allows for execu-
tion of simple I
2
C/SMBus commands.
The SMBus dialog boxes accept numeric data in bina-
ry, decimal, or hexadecimal. Hexadecimal numbers
should be prefixed by $ or 0x. Binary numbers must be
exactly eight digits. See Figure 3 for an illustration
of this tool.
Detailed Description of Hardware
The MAX17065 evaluation kit (EV kit) is a fully assem-
bled and tested surface-mount PCB that evaluates the
high-efficiency MAX17065 organic LED (OLED) driver.
The MAX17065 EV kit provides an on-board I
2
C/SMBus
interface and is connected to the computer through the
USB port. The EV kit includes Windows 2000/XP- and
Windows Vista-compatible software that provides a GUI
for control of the MAX17065’s output voltages, switch-
ing frequency, operating mode, current limit, and SMPS
and charge-pump enables. The MAX17065 EV kit oper-
ates from a +2.3V to +4.5V single power supply.
The MAX17065 includes dual SMPS outputs (+5.35
fixed positive and -5V to -0.5V adjustable negative),
one LDO (+1.9V/60mA), and dual regulated charge
pumps (+5.5V to +9V positive and -5V to -0.5V nega-
tive) for an OLED panel.
Shutdown Control
The MAX7065 can be placed in shutdown mode
through jumper JU1 (see Table 2). When connected to
GND or left open, the VD output is enabled with four ris-
ing CLK edges. When connected to VDDIO, the
MAX17065’s VD is enabled without a CLK signal.
User-Supplied VDDIO Input
The MAX17065’s VDDIO supply is powered from the
USB port by default. Move the shunt of JU2 to the 2-3
position to apply your own +1.6V to +3.6V power sup-
ply at the VDDIO pad. See Table 3 for jumper JU2 con-
figuration. VDDIO voltage decides the SHDN and CLK
logic levels. When CLK is driven by an external signal,
jumper JU2 can be placed in a 2-3 position to allow
external VDDIO voltage.
User-Supplied I
2
C/SMBus Interface
To use the MAX17065 EV kit with a user-supplied
I
2
C/SMBus interface, first move the shunts of JU5 and
JU6 to the 2-3 position. Then connect your SDA and
SCL signals to the corresponding SDA and SCL pads
on the MAX17065 EV kit board. Note: The I
2
C/SMBus
interface is not available until VD is enabled by either
SHDN = VDDIO or four rising CLK edges because SDA
and SCL are pulled up by internal 10kΩ resistors.
Evaluates: MAX17065
MAX17065 Evaluation Kit
_______________________________________________________________________________________ 5
Figure 3. Interface Diagnostic Window
Table 2. Jumper JU1 Function
SHUNT
POSITION
SHDN PIN
LDO OUTPUT
(VD)
Installed*
Connected to
VDDIO
Always on
One pin
Internally
connected to GND
Enabled with four
rising CLK edges
Table 3. Jumper JU2 Function
SHUNT
POSITION
VDDIO PIN
1-2* Powered from +3.3V USB supply
2-3 Powered from external +1.6V to +3.6V supply
* Default position.
* Default position.