MAX14921 Evaluation Kit
Evaluates: MAX14921
Stream Data File Format
Auxiliary Input Section
Theꢀdataꢀisꢀstoredꢀinꢀtheꢀstreamingꢀfileꢀasꢀtext.ꢀTheꢀfirstꢀ
line indicates what range of cell data is captured, up to
16 cells, and whether each T_ input is also captured or
not.ꢀEachꢀsubsequentꢀlineꢀorꢀpairꢀofꢀlinesꢀrepresentsꢀoneꢀ
captured data set.
The device also has three general-purpose analog
inputs (T1–T3) whose voltages can also be presented
to the ADC. Unlike the cell voltage inputs, the T_ inputs
areꢀ neitherꢀ levelꢀ shiftedꢀ norꢀ sampled.ꢀ Theꢀ auxiliaryꢀ
input section provides a way to see these T inputs in
action. Figure 8 and Table 4 detail the available control
and actions.
Actual data starts with the second line. This line records
up to 16 cell voltages, starting with the highest numbered
cell down to the first cell (cell 1). If any of the T_ inputs
areꢀenabled,ꢀtheꢀnextꢀlineꢀisꢀupꢀtoꢀ3ꢀT_ꢀinputꢀvoltages.ꢀIfꢀ
noꢀT_ꢀinputꢀisꢀenabled,ꢀtheꢀthirdꢀlineꢀisꢀinsteadꢀtheꢀnextꢀ
set of cell voltages, captured one repeat time later.
Streaming Data to a File
The EV kit can collect cell and T_ input data and stream it
to a file. This is when the repeat time parameter is used.
At the default setting of 10ms, data is logged at 100 data
sets per second.
Forꢀexample,ꢀinꢀFigureꢀ10,ꢀtheꢀfirstꢀlineꢀofꢀtheꢀfileꢀindicatesꢀ
that all 16 cell voltages are captured, as well as all three
auxiliaryꢀinputs.ꢀTheꢀsecondꢀlineꢀshowsꢀthatꢀcellꢀ16ꢀreadꢀ
0.0392V and cell 15 read 0.0160V. The third line shows
that T1 read 1.1506V, T2 read 4.0587V, and T3 read
4.0950V. This occurred at one time instant. The fourth
andꢀfifthꢀlineꢀwouldꢀreportꢀtheꢀcellꢀandꢀauxiliaryꢀinputs,ꢀlikeꢀ
lines 2 and 3, only one repeat time later. Note that at the
default 100 samples per second (10ms repeat time), the
dataꢀfileꢀcanꢀquicklyꢀgrowꢀquiteꢀlarge.
To stream cell data, push the “Stream to File” control. A
“SaveꢀAs”ꢀ dialogꢀ boxꢀ opensꢀ toꢀ selectꢀ aꢀ fileꢀ toꢀ writeꢀ theꢀ
dataꢀto.ꢀOnceꢀaꢀfileꢀisꢀselected,ꢀclickꢀtheꢀ“Save”ꢀbutton.ꢀ
Streaming continues until the “Stop Streaming” control is
pushed.ꢀNoteꢀthatꢀyouꢀcanꢀquicklyꢀendꢀupꢀwithꢀlargeꢀfiles.
Table 4. EV Kit Auxiliary Input Section Details (Figure 8)
ITEM
LABEL
READ/WRITE
DESCRIPTION
These are the voltages read from the corresponding T_ input. Each T_ input must
beꢀenabledꢀforꢀitsꢀvoltageꢀtoꢀbeꢀacquiredꢀandꢀdisplayed.
1
Voltage
Read
CheckꢀtheꢀboxꢀtoꢀenableꢀorꢀdisableꢀtheꢀcorrespondingꢀT_ꢀinput.ꢀWhenꢀenabled,ꢀ
the T_ input voltage is read and converted at the same repetition rate as the cell
voltages.
2
Enable
Write
CheckꢀtheꢀboxꢀtoꢀenableꢀorꢀdisableꢀtheꢀoptionalꢀbufferꢀforꢀeachꢀT_ꢀinput.ꢀWhenꢀ
unchecked, the corresponding T_ input connects directly to the ADC. Use this
setting for high-drive analog sources. When checked, the T_ input is unity-gain
buffered to the ADC. Use this for low-drive analog signals.
3
4
Buffer
Write
Write
This is the delay time, in microseconds, from when the device presents a T_ signal
to when the ADC conversion begins.
Settling Delay
MaximꢀIntegratedꢀꢀ
│ 10
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