- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄359133 > MC33897 (飛思卡爾半導(dǎo)體(中國)有限公司) Single-Wire CAN Transceiver(單線CAN收發(fā)器) PDF資料下載
參數(shù)資料
| 型號： | MC33897 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 元件分類： | CAN |
| 英文描述： | Single-Wire CAN Transceiver(單線CAN收發(fā)器) |
| 中文描述： | 單線CAN收發(fā)器（單線的CAN收發(fā)器） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 345K |
| 代理商： | MC33897 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33897
11
SYSTEM/APPLICATION INFORMATION
INTRODUCTION
The 33897 is intended for use as a physical layer device in a
single-wire CAN communications bus. The communications
takes place from a single pin over a single wire using a common
ground for a current return path. Two data rates are available,
with the high rate used for factory or assembly line
communications and the lower for actual system
communications where the radiated EMI of the higher rate
could be an issue.
Two pins control of the mode of operation (sleep, low-speed,
high-speed, and high-voltage wake-up).
BLOCK DIAGRAM COMPONENTS
Timer OSC
This circuit generates a 500 kHz signal to be used for internal
logic. It is the reference for some of the required delays.
Timers
This circuit contains the timing logic used to hold the CNTL
active for the required time after the conditions for sleep mode
have been met. It is also used to keep the TXD driver active for
a period of time after it has generated a passive level on the
bus.
Mode Control
This circuit contains the control logic for the various
operating modes and conditions required for the IC.
BUS RCVR
This circuit translates the levels on the BUS pin to a CMOS
level indicating the presence of a data 0 or 1. It also determines
the presence of a high-voltage wake-up (HVWU) signal that is
passed to Mode Control and Timers circuits. An analog filter is
used to “de-glitch” the high-voltage wake-up signal and prevent
false exits from the sleep mode.
TX BUS DRVR
This circuit drives the BUS. It can drive it with the higher
voltage wake-up signals when enabled by the Mode Control
circuit. It can also provide waveshaping for reduced EMI or not
provide it for the higher data rate mode. The actual data is
received on TXD at CMOS logic levels, then translated by this
circuit to the necessary operating voltages.
Undervoltage Detect
This circuit monitors internal operating voltage to assure
proper operation of the part. If a low-voltage condition is
detected, it sends a signal to disable the BUS RCVR and Tx
BUS DRVR circuits. This prevents incorrect data from being put
on the bus or sent to the MCU.
Load Switch
The LOAD switch provides a path for an external resistor
connected to the BUS to be connected to ground. When a loss
of ground is detected, this switch is opened to prevent the
current that would normally be flowing to the ground from the
module from going back through the load resistor and raising
the bus level. The circuit is opened when the voltage between
GND and VBATT becomes too low as would be the case if
module ground were lost.
OPERATION
The 33897 is intended to be used with an MCU to control its
operation and to process and generate the data for the bus.
Ground Pins
The four ground pins are not only for electrical conduction,
their number and locations at each of the four corners serve
also to remove heat from the IC. The biggest benefit of this is
obtained by putting a lot of copper on the PCB in this area and,
if ground is an internal layer, by adding numerous plated-
through connections to it with the largest diameter holes the
layout can use.
TX Data
The data driven onto the SWCAN bus is inverted from the
TXD pin. A “1” driven on TXD will result in an undriven
(recessive) state (bus at near zero volts). When the TXD pin is
low, the output goes to a driven state. The voltage and
waveshaping in the driven state is determined by the levels on
the MODE0 and MODE1 pins (refer to
Table 1
).
Table 1. Mode Control
MODE0
MODE1
Operation
0
0
Sleep Mode
0
1
Transmit High Voltage
(Wake-up)
1
0
Transmit High Speed
1
1
Normal Speed and Voltage
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC33972 | Multiple Switch Detection Interface with Suppressed Wake-Up(帶抑制喚醒功能的多開關(guān)檢測接口) |
| MC33976 | Dual Gauge Driver with Configurable Response Time(帶可設(shè)置響應(yīng)時間的雙標(biāo)尺驅(qū)動器) |
| MC33984 | Dual Intelligent High-Current Self-Protected Silicon High-Side Switch (4.0 mOhm)(雙智能大電流帶自保護功能的硅高端開關(guān)（4mOhm）) |
| MC33989 | System Basis Chip with High Speed CAN Transceiver(帶高速CAN收發(fā)器的系統(tǒng)基片) |
| MC33990 | J-1850 SERIAL TRANSCEIVER(J-1850總線收發(fā)器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC33897AEF | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC SWCAN PB FREE P 2.4 RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MC33897AEFR2 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC SWCAN PB FREE P 2.4 RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MC33897BEF | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC SINGLE WIRE CAN 8 LEAD RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MC33897BEFR2 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC SINGLE WIRE CAN 8 LEAD RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MC33897CTEF | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC SINGLE WIRE CAN RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。