MC33663AJEF Freescale Semiconductor, MC33663AJEF Datasheet - Page 26

• Manufacturer Part Number: MC33663AJEF
• Description: LIN Transceivers dual LINcell
• Manufacturer: Freescale Semiconductor

Specifications of MC33663AJEF

• Rohs: yes
• Operating Supply Voltage: 7 V to 18 V
• Supply Current: 22 uA
• Maximum Operating Temperature: + 125 C
• Package / Case: SOIC-14
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

t
Normal mode.
Receiver Characteristics
state even if communication is sent to TXD1 or TXD2.
When the temperature is below the
Module 2.
function (See
Baud Rate entry (See
RXD pin stays high to signal Fast Baud Rate exit (See
temperature.
DATA INPUT PINS (TXD1, TXD2)
is LOW (dominant), LIN1 (LIN2) output is LOW; when TXD1 (TXD2) is HIGH (recessive), the LIN1 (LIN2) output transistor is
turned OFF. TXD1/TXD2 pins thresholds are 3.3 V and 5.0 V compatible.
automatically into recessive state.
DATA OUTPUT PINS (RXD1, RXD2)
description is the same for both.
a low voltage on RXD. The RXD output structure is a tristate output buffer.
voltage. If EN is set at 3.3 V, RXD V
defined independently.
RXD is pulled LOW to report the wake-up event. An external pull-up resistor may be needed.
26
33663
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
FIRST_DOM
As soon as the device enters Normal mode, the LIN transmitter will be able to send the first dominant bit only after the
The receiver thresholds are ratiometric with the device supply pin.
If the V
For the LIN Module 1, in case of LIN1 Thermal Shutdown, the transceiver and receiver are in recessive and INH1 turned off.
For each LIN Module, the Fast Baud Rate selection is reported by the RXD pin. Fast Baud Rate is activated by the toggle
To exit the Fast Baud Rate and return in Normal or Slow baud rate, a toggle function is needed. At the end the toggle function,
The TXD1 and TXD2 inputs pins are the MCU interface to control the state of the LIN1 and LIN2 outputs. When TXD1 (TXD2)
These pins have an internal pull-up current source to force the recessive state if the input pins are left floating.
If TXD1 (TXD2) stays low (dominant sate) more than 5.0 ms (typical value), the LIN1 (LIN2) transmitter of LIN Module goes
Each LIN Modules integrate the same RXD output structure and functionality. Both pins are independent. The following
RXD output pin is the MCU interface, which reports the state of the LIN bus voltage.
In Normal or Slow baud rate, LIN HIGH (recessive) is reported by a high voltage on RXD; LIN LOW (dominant) is reported by
The RXD output pins are the receiver output of the LIN interface. The low level is fixed. The high level is dependent on EN
In sleep mode, RXD are high-impedance. When a wake-up event is recognized from the WAKE pin or from the LIN bus pin,
SUP
delay. t
voltage goes below the V
Figure
FIRST_DOM
19). At the end of the toggle function, just after EN rising edge, RXD pin is kept low for t
Figure
19).
delay has no impact on the receiver. The receiver will be enabled as soon as the device enters
T
OH
LINSD
RXD
SUP
is 3.3 V. If EN is set at 5.0 V, RXD V
,
under-voltage threshold (
INH1 and LIN1 will be automatically enabled. The same behavior is valid for LIN
Figure 24. RXD interface
LIN_RXD
Figure
20). The device enters into Fast Baud Rate at room and hot
X 1
V
EN_RXD
UVL
Receiver
Control
200 kΩ
Slope
, V
UVH
OH
30 k
EN
), the bus LIN1 and bus LIN2 enter into a recessive
VSUP
Ω
is 5.0 V. The RXD1 and RXD2 V
LIN
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
to flag the Fast
OH
level can be