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BQ78412 Fiches technique(PDF) 20 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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BQ78412 Fiches technique(HTML) 20 Page - Texas Instruments

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bq78412
SLUSAA0 – OCTOBER 2010
www.ti.com
Status Broadcast
The bq78412 can be configured to automatically broadcast a status message block when DevConfig1[0] = 1.
This option allows the output of the UART to be connected to a wireless transmitter so battery status can be
remotely received and displayed.
Automatic transmission of the broadcast status message block is suspended for 60 seconds when a command is
received, after transmission of the current frame is completed. Automatic status transmission restarts a minimum
of 60 seconds after completion of the response to the received command. The address is included in the status
block since it may be desired to have one receiver unit monitor several batteries. Table 6 lists the broadcast
status message block words in the order that they are transmitted.
Table 6. bq78412 Broadcast Status Message Block
BYTE
STATUS
BYTES
DESCRIPTION(2)
UNITS
OFFSET(1)
Device Address
0
1
Address of bq78412
“!”
1
1
Indicates ACK
BatteryStatusWord
2
2
Battery status. See description in BatteryStatusWord section.
-
Temperature
4
2
Battery temperature
°C
BatteryVoltage
6
2
Battery voltage.
mV
Battery current. Positive value = charge current, negative value =
Current
8
2
100 mA
discharge current.
Remaining battery capacity derated as function of discharge
RemCapDerated
10
2
100 mAh
current.
FullChargeCapacity
12
2
Learned battery capacity at full charge, rated load.
100 mAh
Run time to empty derated as a function of discharge current. Only
RunTimetoEmpty
14
2
Minutes
valid during discharge.
CycleCount
16
2
Number of full discharge cycles or equivalents.
AverageCurrent
18
2
Battery current averaged based on CurrentAvgTime parameter.
100 mA
DeratedFCC
20
2
Derated Available Capacity
100 mAh
Accumulated missed charge due to multiple discharges occurring
AccumulatedMissedCharge
22
2
%
before a full charge has occurred.
RelativeStateOfCharge
24
2
Battery relative state of charge.
%
Checksum
26
1
= 0xFF XOR byte 0 XOR byte 1 …..XOR byte24 XOR byte25
(1)
Byte offsets are counted from the start of the broadcast message block.
(2)
Data words are transmitted in Little Endian format (least significant byte first)
While the broadcast message is being generated and transmitted, reception of commands is suspended,
therefore, the response to the command sent may arrive after a broadcast message. Any external device should
verify that the response it receives to a command does not appear to be a broadcast.
20
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): bq78412


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