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MAX9660 Evaluation Kit
Digital Supply Configuration
The MAX9660 EV kit provides two options to power the
MAX9660 digital supply DVDD. DVDD can operate
from the 3.3V supply generated by the USB-to-I 2 C
interface circuit or from a user-supplied 2.5V to 3.6V
DC power supply connected across the DIN and
DGND PCB pads. See Table 1 to configure DVDD
using jumper JU1.
Stand-Alone User-Supplied I 2 C
Communication
The MAX9660 EV kit can be used in stand-alone opera-
tion to interface with a user’s I 2 C system without using a
PC. In stand-alone operation, I 2 C communication oper-
ates from 2.5V to 3.6V. To use the MAX9660 EV kit with
a user-supplied I 2 C interface, perform the following
steps:
Table 1. Digital Supply Configuration (JU1)
1) Disconnect the USB cable from the EV kit.
2) Cut open header J1 shorting traces on the PCB
bottom layer.
3) Move jumper JU1 shunt to pins 1-2 (user-supplied
digital power supply).
4) Connect the positive terminal of a user-supplied
2.5V to 3.6V DC power supply to the DIN PCB pad
and the negative terminal to the nearby DGND PCB
pad.
5) Remove SDA and SCL pullup resistors R11 and
R12 if not needed.
6) Connect the user-supplied I 2 C interface signals to
the EV kit PCB pads, as shown in Table 2.
SHUNT POSITION
1-2
1-2
2-3*
DVDD PIN CONNECTION
DIN PCB pad
DIN PCB pad
+3.3V bus
DVDD POWER
User-supplied
DVDD range: 3.3V to 3.6V**
User-supplied
DVDD range: 2.5V to 3.6V
On-board
I 2 C COMMUNICATION
On-board
User-supplied***
On-board
*Default position.
**Minimum DVDD is limited to 3.3V by the USB-to-I 2 C interface circuit 3.3V logic level.
***Disconnect the USB cable from the EV kit.
Table 2. User-Supplied I 2 C Interface
USER-SUPPLIED
SIGNAL
DVDD
SDA
SCL
GND
SIGNAL
Digital supply
I 2 C data
I 2 C clock
Signal ground return
EV KIT PCB
PAD
DIN
SDA
SCL
DGND
6
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