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ELM329LP Datasheet(PDF) 4 Page - ELM Electronics |
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ELM329LP Datasheet(HTML) 4 Page - ELM Electronics |
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4 / 87 page  ELM329L Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com Pin Descriptions 4 of 87 MCLR (pin 1) A momentary (>2µsec) logic low applied to this input will reset the ELM329. If unused, this pin should be connected to a logic high (VDD) level. Vmeasure (pin 2) This analog input is used to measure a 0 to VDD volt signal that is applied to it. The value measured is scaled by a factor of 5.7 if VDD is >4V, and by a factor of 11 if VDD is <4V. The scaling is appropriate for use with 47K Ω/10KΩ and 47KΩ/4.7KΩ resistor dividers, respectively. The measured voltage is displayed using the AT RV command. Care must be taken to prevent the voltage from going outside of the supply levels of the ELM329, or damage may occur. If it is not used, this pin should be tied to either VDD or VSS. Active LED (pin 3) This output pin is normally at a high level, and is driven to a low level when the ELM329 has determined that it has found a valid (active) protocol. The output is suitable for directly driving efficient LEDs through a current limiting resistor, or for interfacing to other logic circuits. If unused, this pin may be left open-circuited. Note that the behaviour of this pin when the ELM329 is in the low power mode may be modified by the logic level at pin 11, or with PP 0F, bit 4. For the ELM329L, the total current into or from pin 3 must not exceed 2 mA. Control (pin 4) The level at this output may be directly controlled through AT commands. After any reset (powerup, AT Z, etc.), the output reverts to a low level. Pin 4 may also be used to provide an output signal that follows the internal CAN monitor output, by setting bit 0 of PP 0F to 1. For the ELM329L, the total current into or from pin 4 must not exceed 2 mA. Memory (pin 5) This input controls the default state of the memory option. If this pin is at a high level during power-up or reset, the memory function will be enabled by default. If it is at a low level, then the default will be to have it disabled. Memory can always be enabled or disabled with the AT M1 and AT M0 commands. Filter Cap (pin 6) The ELM329L requires that a 10µF filter capacitor be connected between pin 6 and VSS. The capacitor should be a low ESR (<5 Ω) ceramic or tantalum type. The ELM329 uses pin 6 for setting the initial baud rate after power on. Since this option is not available with the ELM329L, it defaults to an initial baud rate of 38400 bps. If you require 9600 bps, you must set PP 0C to 00. LFmode (pin 7) This input is used to select the default linefeed mode to be used after a power-up or system reset. If it is at a high level, then by default messages sent by the ELM329 will be terminated with both a carriage return and a linefeed character. If it is at a low level, lines will be terminated by a carriage return only. This behaviour can always be modified by issuing an AT L1 or AT L0 command. VSS (pin 8) Circuit common must be connected to this pin. XT1 (pin 9) and XT2 (pin 10) A 4.000 MHz oscillator crystal is connected between these two pins. Loading capacitors as required by the crystal (typically 27pF each) will also need to be connected from each of these pins to circuit common (Vss). When laying out a printed circuit board, you may wish to consider placing a guard ring around the oscillator crystal, pins, and capacitors, to provide a little isolation between them and the other signals (particularly the pin 11 CAN input). Note that this device has not been configured for operation with an external oscillator, and it expects a crystal to be connected to these pins. Use of an external clock source is not recommended. Also, note that this oscillator is turned off when in the low power or ‘standby’ mode of operation. CAN Monitor (pin 11) This input serves two functions. If a CAN signal is detected at this pin, the ELM329 assumes that you ELM329L DSA |
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