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参数资料
| 型号： | 33661 |
| 厂商： | Motorola, Inc. |
| 英文描述： | LIN Enhanced Physical Interface |
| 中文描述： | 林增强型物理接口 |
| 文件页数： | 13/20页 |
| 文件大小： | 377K |
| 代理商： | 33661 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33661
13
SYSTEM/APPLICATION INFORMATION
INTRODUCTION
The 33661 is a Physical Layer component dedicated to
automotive LIN sub-bus applications.
The 33661 features include slew rate selection for optimized
operation at 10 kbps and 20 kbps, fast baud rate for test and
programming modes, excellent radiated emission performance,
and safe behavior in case of LIN bus short-to-ground or LIN bus
leakage during low power mode.
Digital inputs are 5.0 V and 3.3 V compatible without any
external component required.
The INH output may be used to control an external voltage
regulator or to drive a LIN bus pullup resistor.
FUNCTIONAL TERMINAL DESCRIPTION
V
SUP
Supply Terminal
The V
SUP
supply terminal is the power supply terminal for the
33661.
LIN Bus Terminal
This I/O terminal represents the single-wire bus transmitter
and receiver.
TXD Input Terminal
The TXD input terminal is the MCU interface to control the
state of the LIN output. When TXD is LOW, LIN output is LOW;
when TXD is HIGH, the LIN output transistor is turned OFF. The
threshold is 3.3 V and 5.0 V compatible. The baud rate
selection (normal or slow mode) is done at device wake-up by
the state of the TXD terminal prior to a HIGH level at the EN
terminal (see
Figures 5
through
10
, page 10).
RXD Output Terminal
The RXD output terminal is the MCU interface, which reports
the state of the LIN bus voltage. LIN HIGH (recessive) is
reported by a high voltage on RXD; LIN LOW (dominant) is
reported by a low voltage on RXD. The RXD output structure is
a CMOS-type push-pull output stage.
The low level is fixed. The high level is dependant on the EN
voltage. If EN is set at 3.3 V, RXD V
OH
is 3.3 V. If EN is set at
5.0 V, RXD V
OH
is 5.0 V.
In the sleep mode, RXD is high impedance. When a wake-up
event is recognized from WAKE terminal or from the LIN bus
terminal, RXD is pulled LOW to report the wake-up event. An
external pullup resistor may be needed.
EN Input Terminal
The EN input terminal controls the operation mode of the
interface. If EN = 1, the interface is in normal mode, with
transmission path from TXD to LIN and from LIN to RXD both
active. The threshold is 3.3 V and 5.0 V compatible. The high
level at EN defines the V
OH
at RXD. The sleep mode is entered
by setting EN LOW while TXD is HIGH. Sleep mode is active
after the t
1
filter time (see
Figure 12
, page 11).
INH Output Terminal
The INH output terminal may have two main functions. It may
be used to control an external switchable voltage regulator
having an inhibit input. The high drive capability also allows it to
drive the bus external resistor in the master node application.
This is illustrated in
Figures 16
and
17
, page 17.
In sleep mode, INH is turned OFF. If a voltage regulator
inhibit input is connected to INH, the regulator will be disabled.
If the master node pullup resistor is connected to INH, the
pullup resistor will be disabled from the LIN bus.
WAKE Input Terminal
The WAKE terminal is a high-voltage input used to wake up
the device from the sleep mode. WAKE is usually connected to
an external switch in the application. The typical wake thresholds
are V
SUP
/2.
The WAKE terminal has a special design structure and
allows wake-up from both HIGH-to-LOW or LOW-to-HIGH
transitions. When entering into sleep mode, the LIN monitors
the state of the WAKE terminal and stores it as a 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 (40
μ
s typical filtering time
delay). WAKE terminal input structure exhibits a high
impedance, with extremely low input current when voltage at
this terminal is below 14 V. When voltage at the WAKE terminal
exceeds 14 V, input current starts 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 33 k
.
Important
The WAKE terminal should
not
be left open. If
the wake-up function is not used, WAKE should be connected
to ground to avoid false wake-up.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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