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ADBMS1818CSWAZ-R7 数据表(PDF) 77 Page - Analog Devices

部件名 ADBMS1818CSWAZ-R7
功能描述  18-Cell Battery Monitor with Daisy Chain Interface
PDF  92 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADBMS1818CSWAZ-R7 数据表(HTML) 77 Page - Analog Devices

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Data Sheet
ADBMS1818
APPLICATIONS INFORMATION
analog.com
Rev. B | 77 of 92
DISCHARGE CONTROL DURING CELL
MEASUREMENTS
If the discharge permitted (DCP) bit is high at the time of a cell
measurement command, the S pin discharge states do not change
during cell measurements. If the DCP bit is low, S pin discharge
states are disabled while the corresponding cell or adjacent cells
are being measured. If using an external discharge transistor, the
relatively low 1 kΩ impedance of the internal ADBMS1818 PMOS
transistors allow the discharge currents to fully turn off before the
cell measurement. Table 73 shows the ADCV command with DCP
= 0. In this table, off indicates that the S pin discharge is forced off
irrespective of the state of the corresponding DCC bit. On indicates
that the S pin discharge remains on during the measurement period
if it was on prior to the measurement command.
In some cases, it is not possible for the automatic discharge
control to eliminate all measurement error caused by running the
discharges. This is due to the discharge transistor not turning off
fast enough for the cell voltage to completely settle before the
measurement starts. For the best measurement accuracy when
running discharge, the mute and unmute commands must be
used. The mute command can be issued to temporarily disable
all discharge transistors before the ADCV command is issued. After
the cell conversion completes, an unmute command can be sent
to reenable all discharge transistors that were previously on. Using
this method maximizes the measurement accuracy with a very
small time penalty.
Method to Verify Discharge Circuits
When using the internal discharge feature, the ability to verify
discharge functionality can be implemented in the software. In
applications using an external discharge MOSFET, an additional
resistor can be added between the battery cell and the source of
the discharge MOSFET, which allows the system to test discharge
functionality.
Table 73. Discharge Control During an ADCV Command with DCP = 0
Discharge Pin
Cell Measurement Periods
Cell Calibration Periods
Cell 1,
Cell 7,
Cell 13
Cell 2,
Cell 8,
Cell 14
Cell 3,
Cell 9,
Cell 15
Cell 4, Cell
10, Cell 16
Cell 5, Cell
11, Cell 17
Cell 6, Cell
12, Cell 18
Cell 1,
Cell 7,
Cell 13
Cell 2,
Cell 8,
Cell 14
Cell 3,
Cell 9,
Cell 15
Cell 4, Cell
10, Cell 16
Cell 5, Cell
11, Cell 17
Cell 6, Cell
12, Cell 18
t0 to t1M
t1M to t2M t2M to t3M t3M to t4M
t4M to t5M
t5M to t6M
t6M to t1C t1C to t2C t2C to t3C t3C to t4C
t4C to t5C
t5C to t6C
S1
Off
Off
On
On
On
Off
Off
Off
On
On
On
Off
S2
Off
Off
Off
On
On
On
Off
Off
Off
On
On
On
S3
On
Off
Off
Off
On
On
On
Off
Off
Off
On
On
S4
On
On
Off
Off
Off
On
On
On
Off
Off
Off
On
S5
On
On
On
Off
Off
Off
On
On
On
Off
Off
Off
S6
Off
On
On
On
Off
Off
Off
On
On
On
Off
Off
S7
Off
Off
On
On
On
Off
Off
Off
On
On
On
Off
S8
Off
Off
Off
On
On
On
Off
Off
Off
On
On
On
S9
On
Off
Off
Off
On
On
On
Off
Off
Off
On
On
S10
On
On
Off
Off
Off
On
On
On
Off
Off
Off
On
S11
On
On
On
Off
Off
Off
On
On
On
Off
Off
Off
S12
Off
On
On
On
Off
Off
Off
On
On
On
Off
Off
S13
Off
Off
On
On
On
Off
Off
Off
On
On
On
Off
S14
Off
Off
Off
On
On
On
Off
Off
Off
On
On
On
S15
On
Off
Off
Off
On
On
On
Off
Off
Off
On
On
S16
On
On
Off
Off
Off
On
On
On
Off
Off
Off
On
S17
On
On
On
Off
Off
Off
On
On
On
Off
Off
Off
S18
Off
On
On
On
Off
Off
Off
On
On
On
Off
Off



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