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MAX9694 Evaluation Kit
The USB-to-I 2 C interface circuit is powered by 2.5V
and 3.3V Maxim MAX8511 voltage regulators. The
application circuit’s digital supply (DVDD) can operate
from the on-board 3.3V supply or from a 2.7V to 3.6V
user supply. A Maxim MAX3394E dual, bidirectional
level translator provides logic-level translation between
the MAXQ2000 low-power 16-bit microcontroller and
the featured MAX9694 reference voltage generator.
Hardware Configuration
for V COM Calibration
To make use of the MAX9694 V COM calibration feature,
connect the DVR_OUT PCB pad to a V COM amplifier or
install appropriate values for resistors R19 and R20. By
default, the EV kit comes with 3.3k Ω installed at set resis-
tor R28. Refer to the Digital Variable Reference (DVR) sec-
tion of the MAX9694 IC data sheet for more information.
Digital Supply Configuration
The MAX9694 EV kit provides two options to power the
MAX9694 DVDD, digital supply input. DVDD can operate
from the 3.3V supply generated by the USB-to-I 2 C inter-
face circuit or from a user-supplied 2.7V to 5.5V DC power
supply connected across the DIN and DGND PCB pads.
The user supply must provide a minimum of 100mA.
See Table 1 to configure DVDD using jumper JU1.
Caution: Always ensure that DVDD is powered before
MAX9694 Slave Address Description
The MAX9694 I 2 C slave address can be set by jumper
JU2. The slave address can be set to one of four different
addresses. See Table 2 for slave address configuration.
Stand-Alone User-Supplied
I 2 C Communication
The MAX9694 EV kit can be used in stand-alone opera-
tion to interface with a user’s I 2 C system without using a
PC. To use the MAX9694 EV kit with a user-supplied
I 2 C interface, perform the following steps:
1) Disconnect the USB cable from the EV kit.
2) Cut open the shorting traces of jumper J2 on the top
layer.
3) Move the jumper JU1 shunt to pins 2-3.
4) Connect the positive terminal of a user-supplied 2.7V
to 5.5V DC power supply to the DIN PCB pad and
the negative terminal to the nearby DGND PCB pad.
5) If the user-supplied I 2 C interface circuit includes
pullup resistors for SDA and SCL, remove resistors
R26 and R27. Resistors R26 and R27 are pulled up
to DVDD.
6) Connect the user-supplied I 2 C interface signals
and signal ground return to the EV kit PCB pads, as
shown in Table 3.
AVDD.
Table 1. Digital Supply Configuration (Jumper JU1)
SHUNT POSITION
1-2*
2-3
2-3
DVDD PIN CONNECTION
3.3V
DVDD PCB pad
DVDD PCB pad
DVDD POWER
On-board
User-supplied
DVDD range: 3.3V to 5.5V**
User-supplied
DVDD range: 2.7V to 5.5V
I 2 C COMMUNICATION
On-board
On-board
User-supplied
*Default position.
**Minimum DVDD is limited to 3.3V by the USB-to-I 2 C interface circuit 3.3V logic level.
Table 2. Slave Address Configuration
Table 3. User-Supplied I 2 C Interface
(Jumper JU2)
SHUNT
A0 PIN
MAX9694 ADDRESS (hex)
USER-SUPPLIED
SIGNAL
SIGNAL
EV KIT PCB PAD
POSITION
1-2*
1-3
1-4
CONNECTION
DGND
DIN
SCL
WRITE
0xE8
0xEA
0xEC
READ
0xE9
0xEB
0xED
SDA
SCL
GND
I 2 C data
I 2 C clock
Signal ground
return
SDA
SCL
DGND
1-5
SDA
0xEE
0xEF
*Default position.
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