参数资料
| 型号： | MCZ33390EF |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 3/15页 |
| 文件大小： | 0K |
| 描述： | IC TXRX SERIAL LINK 8-SOIC |
| 标准包装： | 98 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | J-1850 |
| 电源电压： | 9 V ~ 16 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
33390
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
Class B Module Inputs
Transmitter Data from the MCU (Tx)
The Tx input is a push-pull (N-channel/P-channel FETs)
buffer with hysteresis for noise immunity purposes. This pin
is a 5.0 V CMOS logic level input from the MCU following a
true logic protocol. A logic [0] input drives the BUS output to
0 V (via the external pull-down resistor to ground on each
node), while a logic [1] input produces a high voltage at the
BUS output. A logic [0] input level is guaranteed when the Tx
input pin is open-circuited by virtue of an internal 40 k
pull-
down resistor. No external resistor is required for its
operation.
Waveshaping and 4X/Loop
This input is a tristateable input: 0 V = normal
waveshaping, 5.0 V = waveshaping is disabled for 4X
transmitting, and high impedance = loopback mode of
operation. This is a logic level input used to select whether
waveshaping for the Class B output is enabled or disabled. A
logic [0] enables waveshaping, while a logic [1] disables
waveshaping. In the 4X mode, the BUS output rise time is
less than 2.0 s and the fall time is less than 5.0 s (owing to
the external RC pull-down to ground). In the loopback
condition, the Tx signal is fed back to the Rx output after
waveshaping without being transmitted onto the BUS. This
mode of operation is useful for system diagnostic purposes.
Class B Module Outputs
Transceiver Output (BUS)
This is the output driver stage that sources current to the
bus. Its output follows the waveshaped waveform input. Its
output voltage is limited to 6.25 V to 8.0 V under normal
battery level conditions. The limited level is controlled by an
internal regulator/clamp circuit. Once the battery voltage
drops below 9.0 V, the regulator/clamp circuit saturates,
causing the bus voltage to track the battery voltage. A 1.5 k
±5% external resistor (as well as any 10.6 k
pull-down
resistors of any secondary nodes) sinks the current to
discharge the capacitors during high-to-low transitions. This
sourcing output is short circuit-protected (60 mA to 170 mA)
against a short to -2.0 V and sinks less than 1.0 mA when
shorted to VBAT. If a short occurs, the overtemperature
shutdown circuit protects the source driver of the device. In
the event battery power is lost to the assembly, the bus
transmitter's output stage will be disabled and the leakage
current from the BUS output will not source or sink more than
100 A of current. The transceiver will operate with a remote
ground offset of ±2.0 V, but the lower corners of transmission
will not be rounded during this condition.
Receiver Output to the Microcontroller (Rx)
This is a 5.0 V CMOS compatible push-pull output used to
send received data to the microcontroller. It does not require
an external pull-up resistor to be used. The receiver is always
enabled and draws less than 65 A of current from VBAT. The
receive threshold is dependent on the state of the SLEEP pin.
The receiver circuitry is able to operate with VBAT voltages as
low as 4.25 V and still remains capable of “waking up” the
33390 when remote Class B activity is detected.
When the SLEEP pin is 0 V and message activity occurs
on the bus, the receiver passes the bus message through to
the microcontroller. The 33390 does not automatically “wake
up” from a sleep state when bus activity occurs: the
microcontroller must tell it to do so.
In the Static Electrical Characteristics table, the maximum
voltage for Rx is specified as 4.75 V over an operating range
of -40
°C to 125°C temperature and 7.0 V to 16 V V
BAT. This
maximum Rx voltage is compatible with the minimum VDD
voltage of microcontrollers to prevent the 33390 from
sourcing current to the microcontroller's output.
Switched Ground Output (LOAD)
Normally this output is a saturated switch to ground, which
pulls down the external resistor between the BUS and LOAD
outputs. In the event ground is lost to the assembly, the
LOAD output will bias itself “off” and will not leak more than
100 A of current out of this pin.
Overtemperature Shutdown
If the BUS output becomes shorted to ground for any
duration, an overtemperature shutdown circuit “latches off”
the output source transistor whenever the die temperature
exceeds 150
°C to 190°C. The output transistor remains
latched off until the Tx input is toggled from a logic [0] to a
logic [1]. The rising edge provides the clearing function,
provided the locally sensed temperature is 10
°C to 15°C
below the latch-off temperature trip temperature.
Waveshaping
Waveshaping is incorporated into the 33390 to minimize
radiated EMI emissions.
Receiver Protocol
The Class B communication scheme uses a variable pulse
width (VPW) protocol. The microcontroller provides the VPW
decoding function. Once the receiver detects a transition on
Rx, it starts an internal counter. The initial “start of frame” bit
is a logic [1] and lasts 200 s. For subsequent bits, if there is
a bus transition before 96 s, one logic state is inferred. If
there is a bus transition after 96 s, the other logic state is
inferred. The “end of data” bit is a logic [0] and lasts 200 s.
If there is no activity on the bus for 280 s to 320 s following
a broadcast message, multiple unit nodes may arbitrate for
control of the next message. During an arbitration, after the
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