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參數(shù)資料
| 型號： | MC33399 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | “Local Interconnect Network” Physical Interface(“本地互聯(lián)網(wǎng)”（LIN）物理接口) |
| 中文描述： | “本地互連網(wǎng)絡”物理接口（“本地互聯(lián)網(wǎng)”（林）物理接口） |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 282K |
| 代理商： | MC33399 |
FUNCTIONAL DESCRIPTION
MC33399
Automotive “Local Interconnect Network” Physical Interface
Go to: www.freescale.com
5
VSUP Supply Pin
Device power supply pin. It is connected to battery through
a serial diode for reverse battery protection. The DC operating
voltage is from 7 to 27V. This pin sustains standard
automotive voltage conditions such as 27V DC during jump
start conditions and 40V during load dump. An under voltage
reset circuitry is implemented to disable the transmission path
(from Tx to LIN) when Vsup is falling below 7V in order to
avoid false bus message. Supply current in sleep mode is
20uA typical.
GND Ground Pin
Device gnd connection.
In case ground disconnection at the module level, the
MC33399 does not have significant current consumption on
the LIN bus pin when in recessive state (less than 100uA is
sourced from LIN bus pin, which create 100mV drop voltage
from the 1 kohms LIN bus pull up resistor), for dominant state
the pull up resistor should be always active.
Gnd shift: the MC33399 handle ground shift up to 3V for
Vsup>9V. Below 9V Vsup, ground shift can reduce Vsup
value below the minimum Vsup operation of 7V.
LIN Bus Pin
This I/O pin represents the single-wire bus transmitter and
receiver.
Transmitter Characteristics
The driver is a low side transistor with internal current
limitation and 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 1k
must be added
when the device is used in the master node.
Voltage can go from +40V down to 18V DC below GND (-
18V) without no current other than the pull up resistance. This
pin exhibit no reverse current from the LIN bus line to VSUP,
even in case of GND shift or Vbat disconnection. LIN
thresholds are compatible LIN Protocol Specification.
The fall time, from recessive to dominant and the rise time
from dominant to recessive are controlled to 2V/us typical.
The symmetry between rise and fall time is also guaranteed.
When going from dominant to recessive the bus
impedance parasitic capacitor has to be charged up to Vsup,
and this is done by the total system pull up current resistors. In
order to guarantee the rise time is within the specification,
maximum bus capacitance should not exceed 10nF with bus
total pull up resistance less than 1kOhm.
Receiver Characteristics
The receiver thresholds are ratiometric with the device
supply pin. Typical threshold is 50%, with a hysteresis
between 5 and 10% of Vsupply.
Tx Input Pin
This pin is the MCU interface to control the state of the LIN
output. When Tx is low, LIN output is low, when Tx is high, LIN
output transistor is turned off.
This pin has an internal pull up current source internal 5V
in order to set the bus in recessive state in case the micron
controller could not control it during system power up or down
for instance. During the Sleep mode the pull-up is turned off.
Rx Output Pin
This pin is the MCU interface which reports the state of the
LIN bus voltage. LIN high (recessive) is reported by a high
level on Rx, LIN low (dominant) is reported by a low voltage on
Rx. Rx output structure is a CMOS type push-pull output
stage.
EN Input Pin (Enable)
This pin controls the operation mode of the interface. If
EN=1, the interface is in normal mode, with transmission path
from Tx to LIN and from LIN to Rx both active.
If EN=0, the device is turned into sleep mode or low power
mode, and no transmission is possible. In sleep mode the LIN
bus pin is hold at Vsup through the bus pull up resistors and
pull up current sources. The device can transmit only after
being waked up (see INH pin description).
During sleep mode the device is still supplied from the
battery voltage (through VSUP pin). Supply current is 20uA
typical. Setting the ENABLE pin to low will turn the INHIBIT to
high impedance. EN pin has an internal 20uA pull down
current source to ensure the device is in sleep mode if EN
floats.
INH Output Pin
This pin is used to control an external switchable voltage
regulator having an inhibit input. The inhibit pin is a high side
switch structure to Vsup. When the device is in normal mode,
inhibit high side switch is turned on and the external voltage
regulator is activated. When the device is in sleep mode, the
inhibit switch is turned off and disables the voltage regulator (if
this feature is used).
A wake-up event on the LIN bus line will switch the inhibit
pin to Vsup level. Wake up output current capability is limited
to 280uA. INH pin can also drive an external transistor
connected to an MCU IRQ or XIRQ input to generate an
interrupt. Refer to typical application, figure 7.
Wake Input Pin
This pin is a high voltage input used to wake up the device
from Sleep mode. Wake is usually connected to an external
switch in the application. The typical wake thresholds are
Vsup/2.
Wake pin has special design structure and allows wake up
from both high to low or low to high transitions. When entering
into the Sleep mode, the LIN monitors the state of the wake
pin and stores it as reference state. The opposite state of this
reference state will be the wake up event used by the device
to enter again into normal mode.
An internal filter is implemented, (50
μ
s typical filtering
time delay). Wake pin input structure exhibits a high
impedance, with extremely low input current when voltage at
this pin is below 14V. When voltage at Wake pin exceed 14V
input current start to sink into the device. A serial resistor
should be inserted in order to limit the input current mainly
during transient pulses. Recommended resistor value is
33kohms.
CAUTION : The Wake pin should not be left open. If wake
up function is not used, wake should be connected to GND to
avoid false wake up.
F
Freescale Semiconductor, Inc.
n
.
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