MAX14921 Evaluation Kit
Evaluates: MAX14921
1) CELL SELECTION ENTRY
5) PRODUCT ID INDICATOR
6) DIE REV INDICATOR
7) LDO UV INDICATOR
8) READY BIT INDICATOR
9) OVER TEMP INDICATOR
10) MAX14921 ENABLE
Figure 5. Status Section
Table 1. EV Kit Status Labels
11) ENGAGE OW DETECT
12) PERFORM OFFSET CAL
LABEL
DESCRIPTION
The application has made one measurement,
and continues measuring once the user has
clicked either the “Measure” or the “Measure
Once”ꢀbutton.
Idling
2) SAMPLE TIME ENTRY
3) SETTLING TIME ENTRY
The application is capturing data continuously
and presenting it in the application window.
Measuring
4) REPEAT TIME ENTRY
The device is performing an offset calibration,
asꢀdetailedꢀinꢀtheꢀMAX14920/MAX14921ꢀICꢀ
data sheet.
13) MEASURE REPEATEDLY
OffsetꢀCal
14) MEASURE ONCE
The device is performing an opens check, as
detailedꢀinꢀtheꢀMAX14920/MAX14921ꢀICꢀdataꢀ
sheet.
OpenꢀChk
15) CELL BALANCE GLOBAL
The application is capturing data at speed
fromꢀtheꢀdevice,ꢀandꢀisꢀwritingꢀitꢀtoꢀaꢀdiscꢀfile.
Streaming
Waiting
The application is waiting for an EV kit to be
attached to the PC through a USB port.
Figure 6. Control Section
Table 2. EV Kit Control Section Details (Figure 6)
ITEM
LABEL
READ/WRITE
DESCRIPTION
Enter the number of cells in the battery stack here, from 3–16 cells. This affects
how many cell voltages display in the application window, as well as how many
cellꢀvoltagesꢀareꢀrecordedꢀwhenꢀstreamingꢀdataꢀtoꢀaꢀfile.
Number of
Cells
1
Write
Sets the sample time, from 1ms to 1,000ms. This refers to the t
SAMPL
specificationꢀinꢀtheꢀMAX14920/MAX14921ꢀICꢀdataꢀsheet.ꢀThisꢀisꢀtheꢀlengthꢀofꢀ
time that the device stays in sample phase. Setting this too low affects how
accurately the cell voltages are measured. Setting it too high limits how often the
cellꢀvoltagesꢀcanꢀbeꢀread.ꢀReferꢀtoꢀFigureꢀ5ꢀinꢀtheꢀMAX14920/MAX14921ꢀICꢀdataꢀ
sheet for more details. The default value of 4ms is optimized to work with the
1.2µFꢀsamplingꢀcapacitorsꢀandꢀtheꢀ100Ωꢀseriesꢀresistors.
2
3
Sample Time
Settling Time
Write
Write
Sets the delay from when the device provides a cell voltage sample to when the
ADC starts conversion, from 1µs to 10,000µs. This refers to the t
ꢀspecificationꢀ
SET
inꢀFigureꢀ5ꢀinꢀtheꢀMAX14920/MAX14921ꢀICꢀdataꢀsheet.ꢀLeaveꢀatꢀtheꢀdefaultꢀofꢀ
50µs.
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