Datasheet

Maxim Integrated │ 6
MAX34409 Evaluation Kit Evaluates: MAX34409
www.maximintegrated.com
Detailed Description of Hardware
Monitor Current of Load
To monitor the current of a load, connect one of the screw
terminal current-monitoring inputs (IN1–IN4) in series
with the load, such that the current flows from the positive
terminal to the negative terminal (Figure 3). The maxi-
mumvoltagedropfromINX+toINX-shouldnotexceed
12.25mV.Thesenseresistor(R3X–R6X)mayneedtobe
adjusteddependingonthecurrentbeingmonitored.
User-Supplied I
2
C interface
To communicate with the device using a user-
supplied I
2
C interface, first remove all the J23 jumpers to
disconnect the USB I
2
C dongle. If the dongle is no longer
desired,itcanbeseparatedfromtheEVkitbysnapping
thePCBatthescoredline.ConnectJ1signalsSDAand
SCLtotheoff-boardI
2
C interface and connect power to
the3.3VandGNDsignals.
Troubleshooting
All efforts were made to ensure that each EV kit works on
thefirsttry,rightout-of-the-box.Intherareoccasionthat
aproblemissuspected,SeeTable3tohelptroubleshoot
the issue.
Figure 3. MAX34409 Monitor Load Current
Table 1. Description of Switches (S1)
Table 2. Description of LEDs (D1, D2, D20, D21)
Table 3. Troubleshooting
SWITCH POSITION DESCRIPTION
S1
High ENA:
Enablesshutdown.
Low ENA:Disablesshutdown.
LED COLOR DESCRIPTION
D1 Red ALERT: An overcurrent threshold was exceeded for longer than the overcurrent delay.
D2 Red SHTDN: An overcurrent threshold was exceeded for longer than the shutdown delay.
D20(POWER)
Red USB Power Fault: A fault occurred due to overvoltage limit, current limit, or thermal limit.
Green USB Power: USB power supply is on.
D21(COM)
Red
Communication:
Afterthesoftwarehasinitializedthehardware,theLEDashesred
when a command from the PC is received.
Green Initialized:
Hardwarehasbeeninitializedbysoftware.
SYMPTOM CHECK SOLUTION
GUI indicates: Hardware not found
IstheLEDlabeled
D20red?
If yes, then the electronic fuse is in a fault state. Inspect for
electrical shorts on the PCB and make sure that the PCB is not
sitting on a conductive surface.
DoestheLED
labeledD21turn
green when the GUI
isrunning?
Ifnot,thenexittheGUIandtryrunningitagain.IfD21stilldoesnot
turngreen,thenexittheGUIandtryconnectingtheUSBcableto
adifferentUSBportonthePCandwaitforaWindowsmessage
indicatingthatthehardwareisreadytouse.RuntheGUIagain.
AreanyoftheLEDs
illuminated?
Ifnot,thenthePCBmaynotbegettingpowerfromtheUSB.
TryadifferentUSBcableoradifferentUSBport.
GUI indicates Read Failed! and all
slave addresses are being found
J23 Make sure all four jumpers on J23 are populated.
J1X
SCREW
TERMINAL
12.25mV
MAX
CURRENT
FLOW
LOAD
INX