mc33662 Freescale Semiconductor, Inc, mc33662 Datasheet - Page 23

• Manufacturer Part Number: mc33662
• Description: Lin 2.1 / Saej2602-2, Lin Physical Layer
• Manufacturer: Freescale Semiconductor, Inc

component dedicated to automotive LIN sub-bus
applications.
rate and the 33662J a 10 kbps baud rate. They integrate fast
baud rate for test and programming modes, excellent ESD
robustness, immunity against disturbance, and radiated
emission performance. They have safe behavior in case of a
POWER SUPPLY PIN (VSUP)
33662L, or 33662J, or 33662S. In an application, the pin is
connected to a battery through a serial diode, for reverse
battery protection. The DC operating voltage is from 7.0 to
18 V. This pin can sustain a standard automotive load dump
condition up to 40 V. To avoid a false bus message, an
under-voltage on VSUP disables the transmission path (from
TXD to LIN) when V
Sleep mode is typically 6.0 μA.
GROUND PIN (GND)
33662L, 33662J, and 33662S do not have significant current
consumption on the LIN bus pin when in the recessive state.
LIN BUS PIN (LIN)
receiver. It is suited for automotive bus systems, and is
compliant to the LIN bus specification 1.3, 2.0, 2.1, and
SAEJ2602-2.
Figure
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33662L, 33662J, and 33662S are a physical layer
The 33662L and 33662S features include a 20 kbps baud
The VSUP supply pin is the power supply pin for the
In case of a ground disconnection at the module level, the
The LIN pin represents the single-wire bus transmitter and
The LIN interface is only active during Normal mode (See
LIN overtemperature
INH overtemperature
27).
V
EN
TXD Dominant
SUP
Undervoltage
RXD
X 1
TXD
Figure 27. LIN Interface
LIN Wake up
SUP
OR
falls below 6.7 V. Supply current in
LIN Driver
Slope Control
LIN transmitter and receiver disabled
35µA
INH switched off &
Receiver
EN_sleep
INH_ON
FUNCTIONAL DESCRIPTION
INH
FUNCTIONAL PIN DESCRIPTION
30 k
VSUP
Ω
725 k
INTRODUCTION
Ω
LIN
LIN bus short-to-ground, or a LIN bus leakage during low
power mode.
external required components.
regulator, or to drive a LIN bus pull-up resistor.
Transmitter Characteristics
current thermal shutdown. An internal pull-up resistor with a
serial diode structure is integrated so no external pull-up
components are required for the application in a slave node.
An additional pull-up resistor of 1.0 kΩ must be added when
the device is used in the master node.
line to V
disconnection. The 33662 is tested according to the
application conditions (i.e. in normal mode and recessive
state during communication).
rate) for the 33662L and 33662S devices, or 10 kbps baud
rate (Slow baud rate) for the 33662J device.
transmitter will be able to send the first dominant bit only after
the t
receiver. The receiver will be enabled as soon as the device
enters in Normal mode.
Receiver Characteristics
supply pin.
threshold (
even if communication is sent to TXD.
receiver are in recessive and INH turned off. When the
temperature is below the
automatically enabled.
Fast Baud Rate is activated by the toggle function (See
Figure
rising edge, RXD pin is kept low for t
Rate entry (See
baud rate, a toggle function is needed. At the end of the
toggle function, the RXD pin stays high to signal Fast Baud
Digital inputs are 5.0 and 3.3 V compatible without any
The INH output can be used to control an external voltage
The LIN driver is a low side MOSFET with internal over-
The LIN pin exhibits no reverse current from the LIN bus
The transmitter has a 20 kbps baud rate (Normal baud
As soon as the device enters in Normal mode, the LIN
The receiver thresholds are ratiometric with the device
If the V
In case of LIN thermal shutdown, the transceiver and
The Fast Baud Rate selection is reported by the RXD pin.
To exit the Fast Baud Rate and return in Normal or Slow
FIRST_DOM
22). At the end of the toggle function, just after EN
SUP
SUP
V
, even in the event of a GND shift or V
UVL
voltage goes below the V
, V
delay. t
Figure
UVH
), the bus enters into a recessive state
FIRST_DOM
22).
T
LINSD
,
INH and LIN will be
FUNCTIONAL DESCRIPTION
delay has no impact on the
5
to flag the Fast Baud
SUP
under-voltage
INTRODUCTION
SUP
33662
23