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INA3010N Datasheet(PDF) 3 Page - Integral Corp. |
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INA3010N Datasheet(HTML) 3 Page - Integral Corp. |
3 / 9 page INA3010 3 FUNCTIONAL DESCRIPTION Keyboard operation Every connection of one X-input and one DR-output will be recognized as a legal key operation and will cause the device to generate the corresponding code. The same applies to every connection of one Z-input to one DR-output with the7 proviso that SSM must be LOW. When SSM is HIGH a wired connection must exist between a Z-input and a DR- output. If no connection is present the system number will not be generated. Activating two or more X-inputs, Z-inputs or Z-inputs and X-inputs at the same time is an illegal action and inhibits further activity (oscillator will not start). When one X- or Z-input is connected to more than one DR-output, the last scan signal will be considered as legal. The maximum value of the contact series resistance of the switched keyboard is 7 kW. Inputs In the quiescent state the command inputs X0 to X7 are held HIGH by an internal pull-up transistor. When the system mode selection (SSM) input is LOW and the system is quiescent, the system inputs Z0 to Z3 are also held HIGH by an internal pull-up transistor. When SSM is HIGH the pull-up transistor for the Z-inputs is switched off, in order to prevent current flow, and a wired connection in the Z-DR matrix provides the system number. Outputs The output signal DATA transmits the generated information in accordance with the format illustrated by Fig.3. The code is transmitted using a biphase technique as illustrated by Fig.4. The code consists of four parts: · Start part -1.5 bits (2 ´ logic 1) · Control part -1 bit · System part -5 bits · Command part -6 bits The output signal MDATA transmits the generated information modulated by 1/12 of the oscillator frequency with a 50% duty factor. In the quiescent state both DATA and MDATA are non-conducting (3-state outputs). The scan driver outputs DR0 to DR7 are open drain n-channel transistors and conduct when the circuit is quiescent. After a legal key operation the scanning cycle is started and the outputs switched to the conductive state one by one. The DR-outputs were switched off at the end of the preceding debounce cycle. Command matrix (X-DR) Code X-lines DR-lines Command bits no. 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 5 4 3 2 1 0 0 x x 0 0 0 0 0 0 1 x x 0 0 0 0 0 1 2 x x 0 0 0 0 1 0 3 x x 0 0 0 0 1 1 4 x x 0 0 0 1 0 0 5 x x 0 0 0 1 0 1 6 x x 0 0 0 1 1 0 7 x x 0 0 0 1 1 1 8 x x 0 0 1 0 0 0 9 x x 0 0 1 0 0 1 10 x x 0 0 1 0 1 0 11 x x 0 0 1 0 1 1 |
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