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ELM622 Datasheet(PDF) 2 Page - ELM Electronics |
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ELM622 Datasheet(HTML) 2 Page - ELM Electronics |
2 / 5 page ELM622 Elm Electronics – Circuits for the Hobbyist < http://www.elmelectronics.com/ > Pin Descriptions Ordering Information These integrated circuits are available in either the 300 mil plastic DIP format, or in the 200 mil SOIC surface mount type of package. To order, add the appropriate suffix to the part number: 300 mil Plastic DIP............................... ELM622P 200 mil SOIC..................................... ELM622SM 2 of 5 All rights reserved. Copyright ©1998 Elm Electronics. Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve reliability, function, or design. VDD (pin 1) This pin is the positive supply pin, and should always 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. Tx (pin 2) The transmit data output. When a valid byte is received it is retransmitted from this pin at 9600 baud, least significant bit first, with one start bit, no parity bit, and one stop bit. The pin is normally held at a logic high level when in the idle state, and goes to true logic levels when transmitting data. The output is compatible with standard RS232 data transmission, when coupled through appropriate buffers (transistors or interface ICs such as the MAX232). RTS (pin 3) RTS is the request to send handshaking output. When a valid byte is ready to be sent, this pin will be brought low and will remain at that level until the stop bit has been sent, or the send is aborted due to a time-out. CTS (pin 4) This input pin is used to control the transmission of data. A logic low level allows sending, and a high level forces the ELM622 to wait. The system waits no longer than about 2 seconds, however, before discarding the byte and reverting to the idle condition. The state of the pin is tested just prior to sending data, and is not monitored once data transmission begins. IRRx (pin 5) The output of a standard 40KHz infrared receiver module is connected to this pin, through a series resistor of about 5K Ω value. The output of such a module is normally at a high level, and switches to a logic low when modulated carrier is received. LED (pin 6) This pin provides a logic high level output when a valid code has been received and remains at that level until the data has been sent by the ELM622. The output is suitable for driving an LED through a current limiting resistor. Reset (pin 7) A high level 100msec wide pulse is output on this pin when the sequence 99999 is received. This can be used for special functions such as resetting the system, or momentarily triggering a control point. VSS (pin 8) Circuit common is connected to this pin. This is the most negative point in the circuit. ELM622DSA |
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