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DRV10975ZPWPR Datasheet(PDF) 19 Page - Texas Instruments |
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DRV10975ZPWPR Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 65 page  19 DRV10975, DRV10975Z www.ti.com SLVSCP2E – JANUARY 2015 – REVISED MAY 2018 Product Folder Links: DRV10975 Submit Documentation Feedback Copyright © 2015–2018, Texas Instruments Incorporated Device Functional Modes (continued) For convenience, the encoded value for Rm[6:0] can also be obtained from Table 2. Table 2. Motor Phase Resistance Look-Up Table RPH_CT (Ω) RM[6:0] HEX RPH_CT (Ω) RM[6:0] HEX RPH_CT (Ω) RM[6:0] HEX 0 000 0000 00 0.235 010 1000 28 1.88 101 1000 58 0.0073 000 0001 01 0.264 010 1001 29 2.11 101 1001 59 0.0147 000 0010 02 0.294 010 1010 2A 2.35 101 1010 5A 0.0220 000 0011 03 0.323 010 1011 2B 2.58 101 1011 5B 0.0294 000 0100 04 0.352 010 1100 2C 2.82 101 1100 5C 0.0367 000 0101 05 0.382 010 1101 2D 3.05 101 1101 5D 0.0441 000 0110 06 0.411 010 1110 2E 3.29 101 1110 5E 0.0514 000 0111 07 0.441 010 1111 2F 3.52 101 1111 5F 0.0588 000 1000 08 0.47 011 1000 38 3.76 110 1000 68 0.0661 000 1001 09 0.529 011 1001 39 4.23 110 1001 69 0.0735 000 1010 0A 0.588 011 1010 3A 4.7 110 1010 6A 0.0808 000 1011 0B 0.646 011 1011 3B 5.17 110 1011 6B 0.0882 000 1100 0C 0.705 011 1100 3C 5.64 110 1100 6C 0.0955 000 1101 0D 0.764 011 1101 3D 6.11 110 1101 6D 0.102 000 1110 0E 0.823 011 1110 3E 6.58 110 1110 6E 0.110 000 1111 0F 0.882 011 1111 3F 7.05 110 1111 6F 0.117 001 1000 18 0.94 100 1000 48 7.52 111 1000 78 0.132 001 1001 19 1.05 100 1001 49 8.46 111 1001 79 0.147 001 1010 1A 1.17 100 1010 4A 9.4 111 1010 7A 0.161 001 1011 1B 1.29 100 1011 4B 10.3 111 1011 7B 0.176 001 1100 1C 1.41 100 1100 4C 11.2 111 1100 7C 0.191 001 1101 1D 1.52 100 1101 4D 12.2 111 1101 7D 0.205 001 1110 1E 1.64 100 1110 4E 13.1 111 1110 7E 0.22 001 1111 1F 1.76 100 1111 4F 14.1 111 1111 7F 8.4.1.2 BEMF Constant The BEMF constant, Kt[6:0] describes the motors phase-to-phase BEMF voltage as a function of the motor velocity. The measured BEMF constant (Kt) needs to be converted to a 7-bit digital register value Kt[6:0] to program the BEMF constant value. The digital register value can be determined as follows: 1. Convert the measured Kt to a weighted digital value: Ktph_dig = 1442 × Kt 2. Encode the digital value such that Ktph_dig = Kt[3:0] << Kt[4:6]. The maximum Kt that can be programmed is 1330 mV/Hz. This represents a digital value of 1920 and an encoded Kt[6:0] value of 0x7Fh. The minimum Kt that can be programmed is 0.7 mV/Hz, which represents a digital value of 1 and an encoded Kt[6:0] value of 0x01h. |
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