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BQ78412 Fiches technique(PDF) 14 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
Download  36 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

BQ78412 Fiches technique(HTML) 14 Page - Texas Instruments

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background image
| Current | <
IdleThreshold
Idle
Display =
previous
value
Active
Display on
| Current | >=
TransToActive ,
Sleep
Display off
| Current | >=
TransToActive ,
Time >
SleepTime
bq78412
SLUSAA0 – OCTOBER 2010
www.ti.com
Figure 3. Operational States
COMMUNICATION AND CONTROL
Communications Interface
The bq78412 provides a UART communications interface for parameter initialization during system configuration
and test. This interface also provides real-time measurement capability and access to stored battery performance
data. This interface can be used with RS-232, IrDA, RS-485, or any other transceiver that is compatible with
NRZ- or IrDA-formatted data streams.
The serial interface always operates in multi-drop mode. The default address is 0xFF. The address can be
changed in parameter flash parameter, MultiDropAdr. This design allows multiple batteries to be supported in a
system and accessed from a single point.
Communications to the bq78412 is via messages. The first byte transmitted to the bq78412 is the address byte.
Subsequent bytes are the message. Bytes within a message must be separated by less than 10 bit times.
Messages must be separated by more than 10 bit times.
The bq78412 is configurable for either NRZ- or IrDA-compatible bit encoding.
DevConfig1[13:12] = [0,0]: Multi-drop mode with NRZ encoding. RS-232, RS-485, or wireless transceivers
can be used. (default)
DevConfig1[13:12] = [0,1]: Multi-drop mode with IrDA encoding. IrDA transceivers can be used.
When real-time data are being accessed and/or when the communications mode is active for configuration,
power consumption may increase.
14
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