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ELM329P 参数 Datasheet PDF下载

ELM329P图片预览
型号: ELM329P
PDF下载: 下载PDF文件 查看货源
内容描述: CAN解释 [CAN Interpreter]
分类和应用:
文件页数/大小: 76 页 / 353 K
品牌: ELM [ ELM ELECTRONICS ]
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ELM329  
Pin Descriptions (continued)  
Example Applications section for more information).  
If unused, pin 24 must be connected to a logic high  
(VDD) level.  
be the most positive point in the circuit. Internal  
circuitry connected to this pin is used to provide  
power on reset of the microprocessor, so an external  
reset signal is not required. Refer to the Electrical  
Characteristics section for further information.  
RS232 Rx LED (pin 25), RS232 Tx LED (pin 26),  
OBD Rx LED (pin 27) and OBD Tx LED (pin 28)  
These four output pins are normally high, and are  
driven to low levels when the ELM329 is transmitting  
or receiving data. These outputs are suitable for  
directly driving most LEDs through current limiting  
resistors, or interfacing to other logic circuits. If  
unused, these pins may be left open-circuited.  
M1 (pin 21) and M0 (pin 22)  
These two output pins are provided for use with CAN  
transceiver ICs, as are typically used for Single Wire  
CAN applications. The ELM329 will set both outputs  
to a high level (‘Normal’) after startup, but the level at  
these pins may be changed at any time with the  
AT TM commands, and the level after powerup may  
be set with PP20.  
Note that pin 28 can also be used to turn off all of the  
Programmable Parameters, if you can not do so by  
using the normal interface - see page 61 for more  
details.  
CAN Tx (pin 23) and CAN Rx (pin 24)  
These are the two CAN interface signals that must  
be connected to a CAN transceiver IC (see the  
Unused Pins  
When people only want to implement a portion of what the ELM329 is capable of, they often ask what to do with the  
unused pins. The rule is that unused outputs may be left open-circuited with nothing connected to them, but unused  
inputs must be terminated. The ELM329 is a CMOS integrated circuit that can not have any inputs left floating (or  
you might damage the IC). Connect unused inputs as follows:  
Pin  
1
2
*
5
*
6
*
7
*
11  
*
12  
*
13  
*
15  
H
18  
H
24  
H
Level  
H
The inputs that are shown with an asterisk (*) may be connected to either a High (VDD) or a Low (VSS) level.  
Absolute Maximum Ratings  
Storage Temperature....................... -65°C to +150°C  
Note:  
These values are given as a design guideline only.  
The ability to operate to these levels is neither  
inferred nor recommended, and stresses beyond  
those listed here will likely damage the device.  
Ambient Temperature with  
Power Applied....................................-40°C to +85°C  
Voltage on VDD with respect to VSS..... -0.3V to +7.5V  
Voltage on any other pin with  
respect to VSS........................... -0.3V to (VDD + 0.3V)  
ELM329DSB  
Elm Electronics – Circuits for the Hobbyist  
www.elmelectronics.com  
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