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SI4844 Datasheet(PDF) 4 Page - Silicon Laboratories |
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SI4844 Datasheet(HTML) 4 Page - Silicon Laboratories |
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4 / 71 page  AN610 4 Rev. 0.3 4. ATDD Device Overview The Si4822/26/27/40/44 devices are the tuner ICs for the analog tune digital display (ATDD) market. The Si4822/ 26/27 are the consumer grade FM mono parts and are not EN55020 compliance. In general, any commands and properties associated with setting FM stereo/mono modes and FM blending sent to the ATDD mono parts will simply be ignored and will not have effects. Also, the commands for getting the FM stereo status of a tuned channel is always "mono" for these parts. This effect will not be specified again in the rest of the document. The ATDD device has two operating modes of band detection configuration options: either the ATDD device detects the band or the system controller detects and controls the band by its own mechanism. The diagrams below illustrate how the ATDD device works in each mode. Figure 1. ATDD Device is Responsible for Band Detection Figure 2. System Controller is Responsible for Band Detection Each of these two operating modes requires different hardware configuration. For the ATDD device, the BAND pin of the device must be connected to the band switch resistor or to the power supply pin instead, i.e. VDD1 for Si4822/26/40/44 and VDD for Si4827. At power up, the system controller is required to read the band configuration state bits from the ATDD device and determine which configuration option is responsible for the band detection. The ATDD device is a slave device which requires a host system controller to control it, similar to the Si47xx DTDD family. The communication between the host and the salve devices is via the 2-wire bus mode. Unlike the Si47xx DTDD devices, the ATDD device has its own PVR based tune wheel and resistor ladder based band switch. The ATDD device reads the band switch resistor ladder to determine the frequency band and then reads the PVR tune wheel position for channel tuning. When the ATDD device senses a change in either the PVR tune wheel position or the band switch position, it will send out an interrupt request to the host system controller. The system controller then issues a get status command to read the updated tuned frequency and band status for display on its LCD or LED. The communication interface between the system controller and the ATDD device is the 2-wire bus mode interface. The hardware interface pins of the ATDD device are described in Table 2: Host MCU (Master) ATDD Tuner (Slave) RSTb IRQ SCLK SDIO PVR Tune wheel Band switch Resistor ladder Host MCU (Master) ATDD Tuner (Slave) RSTb IRQ SCLK SDIO PVR Tune wheel FM AM Band select VDD1 |
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