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ATA5760 Datasheet(PDF) 10 Page - ATMEL Corporation |
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ATA5760 Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 41 page  10 4896D–RKE–08/08 ATA5760/ATA5761 8. Polling Mode According to Figure 8-4 on page 13, the receiver stays in polling mode in a continuous cycle of three different modes. In sleep mode the signal processing circuitry is disabled for the time period T Sleep while consuming low current of IS =ISoff. During the start-up period, TStartup, all sig- nal processing circuits are enabled and settled. In the following bit-check mode, the incoming data stream is analyzed bit by bit contra a valid transmitter signal. If no valid signal is present, the receiver is set back to sleep mode after the period T Bit-check. This period varies check by check as it is a statistical process. An average value for T Bit-check is given in the electrical charac- teristics. During T Startup and TBit-check the current consumption is IS =ISon. The condition of the receiver is indicated on pin IC_ACTIVE. The average current consumption in polling mode is dependent on the duty cycle of the active mode and can be calculated as: During T Sleep and TStartup the receiver is not sensitive to a transmitter signal. To guarantee the reception of a transmitted command the transmitter must start the telegram with an adequate preburst. The required length of the preburst depends on the polling parameters T Sleep, TStartup, T Bit-check and the start-up time of a connected microcontroller (TStart_microcontroller). Thus, TBit-check depends on the actual bit rate and the number of bits (N Bit-check) to be tested. The following formula indicates how to calculate the preburst length. T Preburst ≥ TSleep + TStartup + TBit-check + TStart_microcontroller 8.1 Sleep Mode The length of period T Sleep is defined by the 5-bit word Sleep of the OPMODE register, the exten- sion factor X Sleep (according to Table 11-8 on page 25), and the basic clock cycle TClk. It is calculated to be: T Sleep =Sleep × XSleep × 1024 × TClk In US- and European applications, the maximum value of T Sleep is about 60 ms if XSleep is set to 1. The time resolution is about 2 ms in that case. The sleep time can be extended to almost half a second by setting X Sleep to 8. XSleep can be set to 8 by bit XSleepStd to’1’. According to Table 11-7 on page 25, the highest register value of sleep sets the receiver into a permanent sleep condition. The receiver remains in that condition until another value for Sleep is programmed into the OPMODE register. This function is desirable where several devices share a single data line and may also be used for microcontroller polling – via pin POLLING/_ON, the receiver can be switched on and off. Spoll I Soff T Sleep I Son T Startup T Bit-check + () × + × T Sleep T Startup T Bit-check ++ ---------------------------------------------------------------------------------------------------------------- = |
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