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L9965TS Datasheet(PDF) 43 Page - STMicroelectronics |
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L9965TS Datasheet(HTML) 43 Page - STMicroelectronics |
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43 / 62 page  5.8.3.5 SPI ERROR frame It is the IC answer when a wrong MOSI frame has been received. Table 41. SPI Error frame DEV_ID 0x00 Address feedback 0x7F 0x00 CRC 5.8.3.6 RX FIFO EMPTY frame It is the IC answer when the MCU request a read from the RX FIFO and it is empty. Table 42. RX FIFO empty special frame DEV_ID Transceiver Address feedback 0x1C Data read 0xEEEE CRC 5.8.3.7 VIF SHORT TONE – CYCLIC WAKEUP TONE It is a 0x0 frame that represents a CYCLIC_WAKEUP tone. It is sent autonomously by L9965T/TS transceiver when in CYCLIC_WAKEUP state. It is characterized by a specific number of bit and frequency. Table 43. IC reaction to VIF Short tone IC STATE IC reaction upon frame receipt NORMAL • FLT pin is asserted • GEN_STATUS2. WAKEUP_CYCLIC_VIF = 1 CYCLIC_WAKEUP • Tone is discarded CYCLIC_COUNT • If L9965T/TS is in sender mode, tone is discarded. • If L9965T/TS is in listener mode and the cyclic wake up timeout is not expired, the status becomes sender and the cyclic wake up timer is restarted. DEEPSLEEP • Device moves to NORMAL within TVIF_WAKEUP_TIME • FLT pin is asserted • GEN_STATUS2. WAKEUP_CYCLIC_VIF = 1 5.8.3.8 VIF LONG TONE – FAULT/WAKEUP tone It is a 0x0 VIF frame that represents a FAULT/WAKEUP tone from/to the chain. It is characterized by a specific number of bit and frequency. Table 44. IC reaction to VIF LONG tone IC STATE IC reaction upon frame receipt NORMAL • FLT pin is asserted • GEN_STATUS2.WAKEUP_FAULT_VIF = 1 CYCLIC_WAKEUP CYCLIC_COUNT • Device moves to NORMAL within TVIF_WAKEUP_TIME • WKUP and FLT pins are asserted • The sender/listener states of the L9965T is latched in the WAKEUP_CYCLIC_TRX_SENDER • Or WAKEUP_CYCLIC_TRX_LISTENER bits in register GEN_STATUS2 L9965T/L9965TS Functional description DS14987 - Rev 1 page 43/62 |
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