Datasheet
SHUNT POSITION MAX5825A ADDRESS (hex)
JU3 (ADDR0) JU4 (ADDR1) WRITE READ
1-4 1-4 0x20 0x21
Not installed 1-4 0x24 0x25
1-2* 1-4 0x26 0x27
1-4 Not installed 0x30 0x31
Not installed Not installed 0x34 0x35
1-2* Not installed 0x36 0x37
1-4 1-2* 0x38 0x39
Not installed 1-2* 0x3C 0x3D
1-2* 1-2* 0x3E 0x3F
________________________________________________________________ Maxim Integrated Products 11
Evaluates: MAX5823/MAX5824/
MAX5825A/MAX5825B
MAX5825A Evaluation Kit
Table 2. I
2
C Address Settings
*Default position.
User-Supplied Power Supply
The EV kit is powered completely from the USB port
by default. To power the IC with a user-supplied power
supply, move the shunt on jumper JU10 to the 2-3
position and apply a 2.7V to 5.5V power supply at the
VDD_EXT and the nearest GND PCB pads on the EV kit.
The on-board voltage reference (U7) is powered from the
USB interface circuit when the shunt is installed in the
1-2 position on jumper JU13. To use the same external
supply applied at the VDD_EXT PCB pad, move the
shunt to the 2-3 position on JU13.
User-Supplied Reference
The on-board voltage reference (U7) generates a voltage
reference of 2.5V. The user can apply an external voltage
reference by moving the shunt on jumper JU11 to the
2-3 position and applying between 2V and VDD at the
REF_EXT PCB pad on the EV kit. If the internal reference
is selected, the REF pin becomes an output. In this case,
JU11 should be removed.
User-Supplied I
2
C
To evaluate the EV kit with a user-supplied I
2
C bus,
remove shunts from jumpers JU1 and JU2. Apply the
user-supplied SDA signal to header pin H1-1 and the
user-supplied SCL signal to header pin H1-3. If pullup
resistors are on the user-supplied interface, shunts must
not be installed on jumpers JU7 and JU8. Connect the
user-supplied I
2
C ground to header pins H1-2 or H1-4.
User-Supplied IRQ, CLR, and LDAC
Remove shunts from jumpers JU5 and JU6. Apply the
user-supplied IRQ, CLR, and LDAC to header pins
H1-11, H1-15, and H1-17, respectively. Connect the
user-supplied signal ground to header pins H1-12,
H1-16, and H1-18.