PTC04-SENSORS-MULTI-CALIBRATION_BOARD

Application Note: Extension board Using PTC04 Scope The extension board has been designed to control more then one device with the PTC-04. 8 extension boards can be connected to the PTC-04. Each board can calibrate 8 devices using 3 wires per device. So in total 64 devices can be calibrated with the use of one PTC-04. Functional description To address each module separately we are working with 2 ID`s. One will be the board ID (called devID) and the other one the Channel ID, which is the actual module that is selected on the board. The connection between the extension boards and the ptc is done by using a standard DB15 connector. See schematic below EB 8 Din 4162 DB 15 EB 1 Din 4162 DB 15 PTC-04 DB DB 15 DB 15 DB 15 Vdd Gnd Out Rev 001 Page 1 of 4 AN_ EB Application Note: Extension board Using PTC04 Connections and Power supply For the PTC-04 we are using a default DB15 connector. With the following pin numbering Pin Nr 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Rev 001 Name Vdd Out Gnd Mice SCL SDA 5V DO DGND Vdd_Sense Out_Sense Gnd_Sense Channel_state Page 2 of 4 AN_ EB Application Note: Extension board Using PTC04 Connectors on the Extension Board A mail din 41612C64 connector is foreseen on the extension boards using following connections. . Rev 001 Page 3 of 4 AN_ EB Application Note: Extension board Using PTC04 DIP switch A dipswitch is used to indicate the hardware address that is assigned to the Extension Board. As the boards are using an I2C communication it is required that each board can be addressed separately with a specific device number. A binary coding is used for determining the hardware address. Hardware Address DEV1 DEV2 DEV3 DEV4 DEV5 DEV6 DEV7 DEV8 1 2 3 ON OFF ON OFF ON OFF ON OFF ON ON OFF OFF ON ON OFF OFF ON ON ON ON OFF OFF OFF OFF i.e. o f f o n Channel state (DIPSWITCH 4) The signal CH_state is used for feedback purposes during the selection of the Channel ID, used for all 8 extension boards. All boards have one open collector connected trough 47 ohms It is enough to set ON SW1/4 on one board only. Please be sure that this dipswitch is only set to on only 1 time for all the boards. Rev 001 Page 4 of 4 AN_ EB