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L5951 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. L5951
Description  TRIPLE OUTPUT MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO WITH IDR/CLASS 2 INTERFACE
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L5951 Datasheet(HTML) 4 Page - STMicroelectronics

 
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L5951
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high pulse identified by a pulse width of about t = 200
µs.
DATA - Total number of bytes that can be transmitted (from SOF to EOF) is 12 bytes.
Cyclic Redundancy Check (CRC) - A method for determining if the message received is the same as the mes-
sage transmitted. If an invalid CRC number is detected, then an error will be detected. The SOF signal is not
used to determine the CRC. All bits in the CRC are initially "ones" to avoid confusion with a data stream that are
all "zeros".
End of Data (EOD) - Used to signal the receiver about the end of data transmission. If there is a IRF signal, the
sender of the frame will expect one or more bytes in the IFR following the EOD. If there is no IFR used, then the
bus would stay in a logic level low state resulting in a EOF. EOD signal is recognized by a logic level low pulse
for a duration of about 200
µs.
Normalization Bit (NB) - The sole reason for the NB is to define the start of the in-frame response. The first bit
the the IFR is passive, therefore it is necessary to have a signal that follows EOD. There are two forms to the
NB. First of all, the NB is a logic level high pulse. The two forms are distinguished by thier pulse widths. The first
form has a pulse width of about 64
µs and indicates if the IFR contains a CRC or not. The second form has a
longer pulse width of about 128
µs and also indicates if there is a CRC in the IFR or not. The manufacturer can
manipulate the NB to any of the two methods.
In-Frame Response (IFR) - Response bytes are sent by the receiver of the transmission and start after the
EOD. If the IFR stays at a logic level low for a period of time then the frame must be considered to be complete.
IFR bytes can be used to send a signal back to the originator indicating the correct CRC number to confirm the
correct message was sent.
End of Frame (EOF) - Indicates the end of a frame. Once the last byte is transmitted, the bus will be in a logic
level low state for a period of time indicating the end of the frame. EOF signal is recognized by a low pulse for
a width of about 280
µs.
Inter-Frame Separation (IFS) - IFS is used to synchronize the receivers at various nodes.
ABSOLUTE MAXIMUM RATINGS
* denotes active low
THERMAL DATA
(*) With 6cm2 on board heat sink area.
Symbol
Parameter
Value
Unit
VS
DC Operating Supply Voltage
-0.6 to 26.5
V
VDIAG
Diagnostic output voltage
-0.6 to 5.5
V
VIN
Input Control Voltage (EN, Sleep, 4X, Loop, TX)
-0.6 to 5.5
V
VOUT
Output Control Voltage (Reset *)
-0.3 to 5.5
V
VS
Peak Supply Voltage t = 50ms
34
V
Top
Operating Temperature Range
-40 to 85
°C
Tstg
Storage Temperature Range
-40 to 150
°C
Symbol
Parameter
Value
Unit
Rth j-amb
Thermal resistance junction to ambient (*)
50
°C/W


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