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ASL5015FHN 数据表(PDF) 33 Page - NXP Semiconductors |
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ASL5015FHN 数据表(HTML) 33 Page - NXP Semiconductors |
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33 / 69 page  NXP Semiconductors ASL5xxxyHz Matrix LED Controller (MLC) ASL5xxxyHz All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved. Product data sheet Rev. 2.1 — 5 February 2019 33 / 69 The first byte to be read by the MLC is the Most Significant Byte (MSB). Data byte 1 (DB1) in Figure 11. To ensure a robust communication and an accuracy in the CAN clock of less than 0.25 %, the microcontroller sends a dummy clock trimming every 9 ms. The message uses the CAN command 34 and it has no data in the data field. If another message has a cycle of less than 9 ms, then the clock trimming is done with this message and the dummy clock trimming message is not needed any more. The MLC can be controlled by several ECUs thanks to the reserved bits in the extended ID. These bits help to identify the different masters controlling the same MLC or controllers and also gives the possibility of setting a priority due to the known arbitration of the CAN protocol. The master microcontroller can use the same CAN controller to communicate with the rest of the vehicle and with the MLC. The designer just needs to ensure there are no message collisions, which respects ISO CAN rules. 8.16 Application protocol Master to Slave command is always with Extended ID and fixed value in the Standard ID field for synchronization as shown in Figure 11. rec dom Idle (11) Std-ID (11) SRTR IDE SoF Measure and calibrate Ext-ID (18) RTR r1 r0 DLC (4) Del Ack aaa-026613 Data (0...8 byte) CRC (15) EoF (10) DB1 DB8 Figure 11. CAN Ext-ID frame All the MLC ICs are synchronized in every CAN frame they receive, ensuring good synchronization between ICs and a very accurate sampling clock, with an accuracy of less than 0.25 %. Table 26. Standard-ID and the synchronization sequence Standard-ID 1 0 1 0 1 0 1 0 1 0 1 Table 27. Extended-ID format Extended-ID 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 reserved CMD[10:5] Address[4:0] Reserved = should be 0 to fit with the ID of the supplied DBC file. These bits can also be used to drive the MLC or group of MLCs with multiple masters or to avoid message collision when using the same CAN controller in the main microcontroller to communicate with the rest of the vehicle. Address [4:0]: MLC device address (up to 32 ICs in the same CAN network) |
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