Panasonic TX-25V70T — управление телевизором в гостиницах: режим отеля и I2C шина [3/50]

Service Hint Hotel Mode Child Lock Purpose 1 At Hotels this Mode prevent customer from changing the TV preset data such as Channel preset data Note THis Mode is useful for hotel you should not get into Hotel Mode with Normal use Operation 1 To get into Hotel Mode press the remote control Off Timer 0 button and Channel up A key on the TV set simultaneously 2 In this mode The Channel up and down Function will be able as normal Mode and The maximum volume level for this mode is set at the current volume level that means setting at the level before entering the mode However other function will be disable 3 To exit This mode press the remote control Off Timer 0 button and the Volume Down key simultaneously The l2C Bus Concept A Features 1 The l2C bus is a 2 wire serial bus consisting of a clock line SCL and a data line SDA 2 It allows bi directional data transfer between IC s 3 It consists of a master and one or more slave IC s The master initiates transfer and generates clock signals The slave is the IC addressed by a master B I2C Application in the MX 4 Chassis IC601 VCJ SIF VIF MASTER IC1102 MEMORY Fig 1 During transfer the microcomputer IC1101 in the TV set is always the master device IC601 and IC1102 are slave ad dressed by IC1101 1 Various control functions are possible via the l2C bus from the microcomputer IC1101 to VCJ IC601 as shown in Fig 1 2 Data like position BT voltage band AFC skip volume recall power and off timer setting service mode set ting colour setting function etc are stored and read out from the EEPROM IC1102 via the l2C bus