MAX14921EVKIT Datasheet, PDF (8/25 Pages) Maxim Integrated Products – A high-acuuracy 16-cell battery-management reference design

MAX14921 Evaluation Kit
Evaluates: MAX14921
Table 2. EV Kit Control Section Details (Figure 6) (continued)
ITEM
LABEL
READ/WRITE
DESCRIPTION
Sets the delay between acquisitions of a set of cell voltages. For example, at the
default 10ms, the device samples cell voltages 100 times per second. This entry is
4
Repeat Time
Write
ignored by the application when it updates the cell voltages directly on the window.
However, when streaming data to a file, this parameter sets how often a new data
set is written to the file. The repeat time must be at least 1ms greater than the
sample time. If not, the repeat time is about 1ms greater than the sample time.
5
Product
Read
This value is obtained from the device when the EV kit is attached to the PC.
6
Die Revision
Read
This value is obtained from the device when the EV kit is attached to the PC.
This status indicator is updated regularly once the EV kit is attached to the PC.
7
VA UV
Read
A red indicator means that the internal 5V LDO is unable to provide the correct
voltage to the device or to the attached external circuitry.
8
Ready to
Operate
Read
This status bit is updated regularly from the device when the EV kit is attached to
the PC. A red indicator means that there is something wrong with the device.
9
Thermal
Shutdown
Read
This status bit is updated continuously from the device when the EV kit is attached
to the PC. A red indicator means that the device is too hot.
10
Power Down
Action
Click this control button to toggle the EN pin on the device and enable or disable
the IC.
Click this control button to implement open-wire detection as detailed in the First
Method of Open-Wire Detection section in the MAX14920/MAX14921 IC data
11
Detect Open
Wires
Action
sheet. This detection is not continuous and happens once each time this control
is pushed. It updates the open-wire (OW) indicators in the cell voltage readout
section of the application window. Indicators are dimmed green or red when this
information is considered stale.
Click this control button to implement the offset calibration feature, as detailed in
12
Offset Cal
Action
the Buffer Amplifier Offset Calibration section in the MAX14920/MAX14921 IC
data sheet. The output buffer offset is minimized once calibration is complete.
Click this control button to enable continuous reading of the cell voltages, the
13
Measure
Action
cell U/OV bits, and the T1–T3 voltages. The application updates 6 to 7 times per
second unless the sample time is set too high.
14
Measure Once
Action
Click this control button to disable continuous reading. Only one set of data is
measured and presented in the application window when this button is pushed.
15
Balance
Enable/Disable
Selection
This global control either disables or enables cell balancing for all cells whose
balance checkboxes are checked. Cell balancing can be individually enabled with
the balance checkboxes.
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