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DRV8461SPWPR 数据表(PDF) 69 Page - Texas Instruments |
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DRV8461SPWPR 数据表(HTML) 69 Page - Texas Instruments |
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69 / 117 page  The first device in the chain receives data from the MCU in the following format for 3-device configuration: 2 bytes of header (HDRx) followed by 3 bytes of address (Ax) followed by 3 bytes of data (Dx). HDR1 HDR2 A3 A2 A1 D3 D2 D1 SDI1 nSCS S3 S2 S1 HDR1 HDR2 R3 R2 R1 SDO3 S1 HDR1 HDR2 A3 A2 R1 D3 D2 SDO1 / SDI2 S2 S1 HDR1 HDR2 A3 R2 R1 D3 SDO2 / SDI3 All Address bytes reach destination All Data bytes reach destination Reads executed here Writes executed here Status response here Figure 7-50. SPI Frame With Three Devices After the data has been transmitted through the chain, the MCU receives the data string in the format shown in Figure 7-51 for 3-device configuration: 3 bytes of status (Sx) followed by 2 bytes of header followed by 3 bytes of report (Rx). HDR1 HDR2 A3 A2 A1 D3 D2 D1 SDI nSCS S3 S2 S1 HDR1 HDR2 R3 R2 R1 SDO Figure 7-51. SPI Data Sequence for Three Devices The header bytes contain information of the number of devices connected in the chain, and a global clear fault command that will clear the fault registers of all the devices on the rising edge of the chip select (nSCS) signal. Header values N5 through N0 are 6 bits dedicated to show the number of devices in the chain. Up to 63 devices can be connected in series for each daisy chain connection. The 5 LSBs of the HDR2 register are don’t care bits that can be used by the MCU to determine integrity of the daisy chain connection. Header bytes must start with 1 and 0 for the two MSBs. HDR 1 HDR 2 1 0 N5 N4 N3 N2 N1 N0 1 0 CLR x x x x x No. of devices in the chain (up to 2 6 ± 1= 63) 1 = global FAULT clear 0 = GRQ¶W FDUH 'RQ¶W FDUH Figure 7-52. Header Bytes The status byte provides information about the fault status register for each device in the daisy chain so that the MCU does not have to initiate a read command to read the fault status from any particular device. This www.ti.com DRV8461 SLOSE98 – DECEMBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 69 Product Folder Links: DRV8461 |
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