MAX7320EVKIT+ Maxim Integrated, MAX7320EVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX7320EVKIT+
• Description: Interface Development Tools Evaluation Kit for the MAX7320
• Manufacturer: Maxim Integrated
• Series: MAX7320r

Specifications of MAX7320EVKIT+

• Operating Supply Voltage: 1.71 V to 5.5 V

MAX7320 Evaluation Kit
The MAX7320 EV kit provides a proven layout for the
MAX7320. The microcontroller circuitry (U2, U3, U4,
U5, and U6) is equivalent to Maxim’s MAXQ2000-based
MINIQUSB board. Jumper blocks JU1 and JU3 select
the I
H2 provide labeled test points for all of the MAX7320
pins.
To use the MAX7320 EV kit with a user-supplied I
interface, first cut the JU5 and JU6 default traces, dis-
connecting SCL and SDA from the on-board microcon-
troller. If the user-supplied I
SCL/SDA pullup resistors, then disable on-board pullup
resistors R7 and R8 by cutting the JU12 and JU13
default traces. Next, apply your own 1.71V to 5.5V
power supply between the EXT V+ and GND pads.
Lastly, connect your SCL and SDA signals to the corre-
sponding SDA and SCL test points on header H2 on
the MAX7320 EV kit board.
The MAX7320 EV kit is powered completely from the
USB port by default.
As shipped from the factory, the V+ supply voltage is
connected to the on-board 3.3V regulator by jumper JU2.
To configure the EV kit to accept user-supplied power
between 1.71V and 3.6V:
1) Remove shunts from JU4 (if present).
2) Connect external power supply between the EXT V+
3) Move JU2 shunt to the 2-3 position.
4
Detailed Description of Hardware
oval pad and the GND oval pad.
_______________________________________________________________________________________
2
C device address (see Table 2). Headers H1 and
User-Supplied I
Operation with External
1.71V to 3.6V Supply
2
C bus provides its own
2
C Interface
2
C
As shipped from the factory, the V+ supply voltage is
connected to the on-board 3.3V regulator by jumper JU2.
To configure the EV kit to accept user-supplied power
between 1.8V and 5.5V requires cutting traces and mount-
ing additional components. The absolute maximum rating
of the MAXQ2000 microcontroller is 3.6V—if SCL or SDA
ever exceed 3.6V, the microcontroller may be dam-
aged. To protect the MAXQ2000 against high voltage, a
level translation circuit can be mounted on the board.
1) Obtain the following parts listed below (Maxim does
2) Cut the PCB trace that shorts across JU5 and JU6.
3) Mount components Q1, Q2, R12, and R14.
4) Remove shunts from JU4 (if present).
5) Connect external power supply between the EXT V+
6) Move JU2 shunt to the 2-3 position.
To restore the EV kit, remove Q1 and Q2 and then
install shunts at JU5 and JU6. If Q1 and Q2 are not
removed, the 2N7002’s body diode will be forward
biased, which may prevent the SCL and SDA signals
from meeting minimum logic-high threshold V
DESIGNATION
not supply these components).
oval pad and the GND oval pad.
R12, R14
Q1, Q2
QTY
2
2
2N7002 (SOT23)
Central Semiconductor 2N7002FC
Diodes Inc. 2N7002-7-F
Fairchild 2N7002_NL
Vishay/General Semi 2N7002-E3
10kΩ ±5% resistors (0603)
Operation with External
1.8V to 5.5V Supply
DESCRIPTION
IH
(min).