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ELM633 Datasheet(PDF) 11 Page - ELM Electronics |
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ELM633 Datasheet(HTML) 11 Page - ELM Electronics |
11 / 11 page 11 of 11 ELM633 ELM633DSB Elm Electronics – Circuits for the Hobbyist < http://www.elmelectronics.com/ > Example Applications (continued) This mode is entered into automatically if the RS232Rx input is found to be at an active level for the entire startup time period. This is the period of time that it takes for the ELM633 to stabilize on a power-up or reset, prior to issuing the first ‘ELM633 v2.0’ message. Since pin 4 is shown connected high, if pin 5 is held low for at least the initial period, the device will immediately enter the AT MA mode, as if a user had sent the command. This is convenient if one wants to monitor all LIN bus data, but does not particularly want to manually have to initiate the monitoring. This would be useful if making a ‘smart’ adapter cable, for example. Circuit power is from three button cells, which provide 4.5V to the circuit through a momentary action pushbutton switch. The 4.5V is at the lower level of recommended voltages, but is still within specified limits, so works fine. These examples have hopefully provided enough information to get you started with LIN devices. The LIN standard shows considerable promise for low-cost circuits that can be used in lower speed networks such as for man-machine interfaces. While they are relatively new and not too frequently found at this time, they are beginning to turn up everywhere… Figure 4. LIN Logic Probe 3.58MHz 27pF 10K Ω 4.7K Ω 1 2 3 4 7 6 5 633 8 27pF 2 (RxD) 5 (SG) 3 (TxD) RS232 Interface 4.7K Ω LIN Data Signal Ground LIN Interface 10K Ω 22K Ω 0.01µF +4.5V |
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