Device, especially input device, and method for changing the controlling unit for data transmission

Device (100, 200, 400, 500) according to one of the preceding claims, wherein the device (500) is an optical input device (100, 200, 400, 500) for detecting input of a user based on movement of the input device (100, 200, 400, 500) relative to a surface (SF), comprising a case (C), an optical unit (OU) that comprises the sensor and an electrical unit (EU),

• wherein the optical unit (OU) comprises a radiation source (RS) and the sensor (SEN, SE) arranged within the case (C) or on the case (C),
• wherein preferably the elements of the optical unit (OU) are arranged such that radiation (R1) emitted by the radiation sensor (SE) is directed to a surface (SF) on which the case (C) is moved by the user and such that radiation (R1) that is reflected by the surface (SF) is received by the radiation sensor (SE), wherein the electrical unit (EU) comprises the first communication unit (CU1, SPI1, I2C1) and the second communication unit (CU2, SPI2, I2C2) arranged within the case (C),
• wherein preferably the digital data (D2 or D2b) comprises data (D2) generated by the radiation sensor (SE) or processed data (D2b) derived from data (D2) generated by the radiation sensor (SE).

Device (100, 200, 400, 500) according to one of the preceding claims, wherein the first communication unit (CU1, SPI1, I2C1) comprises a first port adapted to output a clock signal (SCLK, SCL) used for synchronizing the communication between the first communication unit (CU1, SPI1, I2C1) and the second communication unit (CU2, SPI2, I2C2) and wherein the second communication (CU2, SPI2, I2C2) unit comprises a first port electrical connected to the first port of the first communication unit (CU1, SPI1, I2C1) and adapted to receive a clock signal (SCLK, SCL), and/or wherein the first communication unit (CU1, SPI1, I2C1) comprises one or at least one data port adapted to output a data signal used for transmitting the digital data from the first communication unit (CU1, SPI1, I2C1) to the second communication unit (CU2, SPI2, I2C2) and wherein the second communication unit (CU2, SPI2, I2C2) comprises one or at least one data port adapted to receive the output signal.

Device (100,200, 500) according to one of the preceding claims, wherein a shift register based communication is used for the communication between the first communication unit (CU1) and the second communication unit (CU2), and/or

• wherein data transmission is performed without transmitting an address of the first communication unit (CU1, SPI1) and/or without transmitting an address of the second communication unit (CU2, SPI2),
• wherein preferably the communication uses SPI or SSI.

Device (200, 400, 500) according to any one of the preceding claims, wherein the device (200, 400, 500) comprises at least one of:

• a first direct memory access unit (DMA1) that transfers data from the sensor (SEN, SE) or from a first memory unit (M1) to the first communication unit (CU1, SPI1, I2C1), or
• a second direct memory access unit (DMA2) that transfers data from the second communication unit (CU2, SPI2, I2C2) to a second memory unit (M2) or to another unit used to transfer the digital data received via the second communication unit (CU2, SPI2, I2C2).

Device (100 to 500) according to any one of the preceding claims, wherein the first communication unit (CU1, SPI1, I2C1) is adapted to send digital control data (C1) to the second communication unit (CU2, SPI2, I2C2),

• wherein the digital control data (C1) sent by the first communication unit (CU1, SPI1, I2C1) or by the second communication unit (CU2, SPI2, I2C2) indicates that the second communication unit (CU2, SPI2, I2C2) has to operate as the controlling (M) unit for further data transfer, and/or
• wherein the first communication unit (CU1, SPI1, I2C1) is adapted to receive digital control data from the second communication unit (CU2, SPI2, I2C2),
• wherein the digital control data received by the first communication unit (CU1, SPI1, I2C1) indicates that the first communication unit (CU1, SPI1, I2C1) has to operate as the controlling unit (M) for further data transfer.

Device (100 to 500) according to any one of the preceding claims, wherein the sensor (SEN) is a radiation sensor (SE),

• wherein the device (100 to 500) is adapted such that the digital data (D2) is data generated by the radiation sensor (SE) or by an analog digital converter that is adapted to convert analog output date of sensor (SE) to digital data (D2),
• whereby preferably the device (100, 200, 400, 500) is adapted such that for each picture element (PE) of the radiation sensor (SE) corresponding data (D2) is transmitted.

Device (100, 200, 400, 500) according to any one of the preceding claims,

• wherein the device (100, 200, 400, 500) comprises a first electrical unit (EU1) that comprises at least one first integrated chip (IC1) and a second electrical unit (EU2) that comprises at least one second integrated chip (IC2)

Device (100, 200, 400, 500) according to any one of the preceding claims,

• wherein the device (100, 200, 400, 500) comprises a processing unit (P2) that is adapted to realize a third communication unit, preferably a communication unit that transmits data via a wire, preferably according to the USB standard.