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| 型号： | MC33199 |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 英文描述： | ISO 9141 Serial Link Driver(ISO-9141串行链路驱动器) |
| 中文描述： | 标准9141串行连接驱动器字符（ISO - 9141串行链路驱动器） |
| 文件页数： | 10/12页 |
| 文件大小： | 549K |
| 代理商： | MC33199 |
MC33199
10
MC33199
I
ntroduction
The MC33199D is a serial interface circuit used in diag-
nostic applications. It is the interface between the microcon-
troller and the special K and L lines of the ISO diagnostic
port. The MC33199D has been designed to meet the Diag-
nosis System ISO9141 specification.
This product description will detail the functionality of the
device (see simplified block diagram). First, the power supply
and reference voltage generator will be discussed, then the
paths functions between MCU, K and L lines will be detailed.
A dedicated paragraph will tell about the special functionality
of the I1 pin, which allow high Baud rates transmission.
Power supplies and reference voltage
The device has two power supplies :
A 5V supply, Vcc, normally connected to the MCU supply
voltage. This pin sink typically 1mA during operation. A Vbat
supply voltage, VS, normally tied to the car battery voltage.
This pin can sustain up to 40V DC. Care should be taken for
reverse battery protection and transient voltages higher than
40V.
The voltage reference generator is supplied from both Vcc
and Vbat. It provides reference voltage for the K and L lines
comparators thresholds. The reference voltage is dependant
on Vbat voltage : it is linear versus Vbat voltage, for Vbat
from 5,6V to 18V. Below 5.6V and over 18V the reference
voltage is clamped (see fig 11). The reference is connected
externally to the device, through REF-OUT pin. It is available
for other needs. It can supplied 50uA max (see fig 12).
Path functions between MCU, K and L lines
The path function from the MCU to the K line is composed
of a driver interfacing directly with the MCU through the TXD
pin. The TXD pin is CMOS compatible. This driver controls a
power transistor which can be turned ON or OFF. When it is
ON, it pull the DIA pin low. This pin is known as K line in the
ISO 9141 specification. The DIA pin structure is open collec-
tor, without pull up component. This allow the connection of
several MC33199 on the K line and the use of a single pull
up resistor per system (see fig 6). In order to protect the DIA
pin against short circuits to Vbat, the device incorporates a
current limitation (see fig 16) and a thermal shutdown. This
current limitation will also act when the device drives a K line
bus exhibiting large parasitic capacitor value (see
Special
functionality of I1 pin
below).
The path from this DIA pin, or K line, to the MCU is done
through a comparator. The comparator threshold voltage is
connected to REF-IN-K pin. It can be tied to the REF-OUT
voltage, if the Vbat dependant threshold to be achieved. The
second input of this comparator is internally connected to
DIA pin. The output of the comparator is available on RXD
output pin, normally connected to a MCU I/O port. RXD pin
has a 2kOhms internal pull up resistor.
The path from the L line, used during wake-up sequence of
the transmission, to the MCU is done through a second com-
parator. The comparator threshold voltage is connected to
REF-IN-L pin. As the REF-IN-K pin, it can be tied to the REF-
OUT voltage, if the Vbat dependant threshold need to be
achieved. The second input of this comparator is internally
connected to L pin. The output of the comparator is available
on LO output pin, which is an open collector structure. LO is
normally connected to a MCU I/O port.
The DIA, and L pins can sustain up to 38V DC. Care
should be taken for reverse battery protection and transient
voltages higher than 38V.
The DIA and L pins both have internal pull down current
source of typically 7,5uA (see fig 14). So the L line exhibits a
10uA pull down current. The DIA pin has the same behaviour
when it is in OFF state, that is when TXD is at logic high
level.
Special functionality of I1 pin
The MC33199D has a unique feature which allow the
transmission Baud rate to be up to 200kBauds. In practice,
the K line can be several meters long, and thus can have a
large parasitic capacitor value. This parasitic capacitor value
will slow down the low to high transition of the K line, and
indeed will limit the Baud rate transmission. For the K line to
go from low to high level, the parasitic capacitor need to be
charged, and it can only be charged by the pull up resistor. A
low pull up resistor value would result in fast charge time of
the capacitor, but also in large output current, and large
power dissipation in the driver.
To avoid this problem, the MC33199D incorporates a
dynamic current source, which is temporary activated at the
low to high transition of the TXD pin, that is when the DIA pin
or K line should switch from low to high level (see fig 3 & 4).
This current source is available at I1 pin. It has a typical
value of 80mA. It is activated for 4us (see fig 21 & 22) and is
automatically disabled after this time. During that time it will
charge the K line parasitic capacitor. This extra current will
quickly rise the K line voltage up to the Vbat, and will result in
reduce rise time on the K line. With this feature the
MC33199D can ensure Baud rate transmission of up to
200kBauds.
During high to low transition on the K line, the parasitic
capacitor of the bus line will be discharged by the output
transistor of the DIA pin. In this case, the total current may
exceed the internal current limitation of the DIA pin. If so, the
current limitation will act, and discharge current will be lim-
ited to typically 60mA (See fig 4 & 16).
If a high Baud rate is necessary, the I1 pin need to be con-
nected to the DIA as shown in the typical application fig 5.
The I1 pin can also be left open, if the I1 functionality and
high Baud rate are not suited in the application.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相关代理商/技术参数 |
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| MC33199D | 功能描述:DRV AUTO ISO 9141 SER LNK 14SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MC33199DR2 | 功能描述:IC DRVR SER INK ISO9141 14-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MC33200 | 制造商:SPC Multicomp 功能描述:RESETTABLE FUSE 60V 1.35A |
| MC33201 | 制造商:SPC Multicomp 功能描述:RESETTABLE FUSE 60V 1.6A |
| MC33201D | 功能描述:运算放大器 - 运放 1.8-12V Sngl Rail to RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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