MAX14921EVKIT Datasheet, PDF (7/25 Pages) Maxim Integrated Products – A high-acuuracy 16-cell battery-management reference design

MAX14921 Evaluation Kit
Evaluates: MAX14921
Figure 5. Status Section
Table 1. EV Kit Status Labels
LABEL
Idling
Measuring
Offset Cal
Open Chk
Streaming
Waiting
DESCRIPTION
The application has made one measurement,
and continues measuring once the user has
clicked either the “Measure” or the “Measure
Once” button.
The application is capturing data continuously
and presenting it in the application window.
The device is performing an offset calibration,
as detailed in the MAX14920/MAX14921 IC
data sheet.
The device is performing an opens check, as
detailed in the MAX14920/MAX14921 IC data
sheet.
The application is capturing data at speed
from the device, and is writing it to a disc file.
The application is waiting for an EV kit to be
attached to the PC through a USB port.
Figure 6. Control Section
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
11) ENGAGE OW DETECT
12) PERFORM OFFSET CAL
2) SAMPLE TIME ENTRY
3) SETTLING TIME ENTRY
4) REPEAT TIME ENTRY
13) MEASURE REPEATEDLY
14) MEASURE ONCE
15) CELL BALANCE GLOBAL
Table 2. EV Kit Control Section Details (Figure 6)
ITEM
1
2
3
LABEL
Number of
Cells
Sample Time
Settling Time
READ/WRITE
Write
Write
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
cell voltages are recorded when streaming data to a file.
Sets the sample time, from 1ms to 1,000ms. This refers to the t_SAMPL
specification in the MAX14920/MAX14921 IC data sheet. This is the length of
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
cell voltages can be read. Refer to Figure 5 in the MAX14920/MAX14921 IC data
sheet for more details. The default value of 4ms is optimized to work with the
1.2µF sampling capacitors and the 100Ω series resistors.
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_SET specification
in Figure 5 in the MAX14920/MAX14921 IC data sheet. Leave at the default of
50µs.
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