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MAX9694 Evaluation Kit
I 2 C Address Setting
The MAX9694’s I 2 C slave address is displayed in the
I2C Address Setting drop-down list and in the bottom
status bar of the software window. If an address is
manually selected in the drop-down list, the software
verifies the address and changes the address dis-
played appropriately. If no acknowledge is received
from the EV kit, a pop-up window opens, directing the
user to properly set jumper JU2 on the EV kit. If the
Auto Detect Address checkbox is checked, the soft-
ware automatically detects the I 2 C address of the
MAX9694.
Upper and Lower DAC Output Voltages
The upper and lower DAC output voltages are generat-
ed using an on-board resistor-divider network. The user
can also apply external references to the VREFU_H,
VREFU_L, VREFL_H, and VREFL_L and AGND PCB
pads. The voltages on these four pads MUST be cap-
tured and typed into the appropriate edit boxes in the
Reference Voltages (V) group box for the calculated
DAC output voltages shown in the Upper DAC
Output (V) edit box. The software uses a register
value that generates a voltage closest to the
desired voltage value.
When a register value is changed, the corresponding
field changes its color to red. A user should synchro-
nize the GUI fields and actual device registers by
pressing the Load All Values To Registers button.
The Load All Reg Values From File button is used to
load all the register values and reference voltages from
a user-selected text file. The Save All Reg Values To
File button is used to save all the register values and
reference voltages on the current GUI to a user-named
text file.
V COM Calibration
V COM calibration is controlled using the scrollbar and
edit box of the DVR_OUT group box (see the Hardware
Configuration for V COM Calibration section to make use
of this feature). The register value for the 7-bit DAC
controls the DVR_OUT sink current adjusting the volt-
age at the DVR_OUT pin as follows:
V DVR = ?
? ? × ? 1 ? ? ? 128 ? ? × ? ? 20 × R 28 ? ? ? × AVDD
Channels and Lower DAC Channels group boxes to
be correct.
The transfer function for the upper DAC channels is:
? R20
? R19 + R20
? ? ? D + 1 ? ? R19 ? ?
? ?
V OUT = V REFU_L +
D
256
× (VREFU_H - VREFU_L)
where D is the DVR_OUT 7-bit register value and AVDD
is the voltage at the AVDD PCB pad.
The transfer function for the lower DAC channels is:
Advanced User Interface
A serial interface can be used by advanced users by
V OUT = V REFL_L +
D
256
× (VREFL_H - VREFL_L)
clicking Options | Interface (Advanced Users) from
the menu bar.
Click on the 2-wire interface tab shown in Figure 2.
In both equations, D is the register’s decimal value.
Refer to the MAX9694 IC data sheet for more details.
When the evaluation software is run for the first time,
the reference input-voltage values in the Reference
Voltages (V) group box are loaded from an initialization
file (REF.INI). When the program is closed, the current
values are logged into the initialization file. The next
time the program is run, the latest values are loaded
automatically.
Output Register Values
Each DAC channel’s register value can be set in three
ways within the Upper DAC Channels and Lower DAC
Channels group boxes by:
Press the Hunt for active listeners button to obtain the
current MAX9694 slave address in the Target Device
Address: combo box. In the General commands tab
select 1 – SMBusWriteByte(addr,cmd,data8) in the
Command (SMBus Protocols, Raw Block Read/Write,
EEPROM Read/Write) drop-down list. Enter the desired
values into the Command byte: and Data Out: combo
boxes and then press the Execute button.
Detailed Description of Hardware
The MAX9694 EV kit demonstrates the MAX9694 refer-
ence voltage generator in a 32-pin TQFN surface-
mount package with an exposed pad. EV kit
applications include gamma correction in TFT-LCD
?
?
?
Moving the channel’s scrollbar.
Typing register values directly into the channel’s
Reg Value edit box (decimal 8-bit equivalent).
Typing the expected output voltage in the channel’s
panels, such as those found in high-resolution TVs,
high-end monitors, or for general industrial reference
voltage generation. Using four input reference voltages
(DAC reference inputs), the MAX9694 EV kit provides
14 programmable reference voltage outputs (DAC out-
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