DRV10983-Q1 Datasheet, PDF (18/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

DRV10983-Q1
SLVSD14 – JUNE 2017
www.ti.com
Device Functional Modes (continued)
The motor resistance (R_{PH_CT}) must be converted to a 7-bit digital register value Rm[6:0] to program the motor
resistance value. The digital register value can be determined as follows:
1. Convert the motor resistance (R_{PH_CT}) to a digital value where the LSB is weighted to represent 9.67 mΩ:
Rmdig = R_{PH_CT} / 0.00967.
2. Encode the digital value such that Rmdig = RMValue[3:0] << RMShift[2:0].
The maximum resistor value, R_{PH_CT}, that can be programmed for the DRV10983-Q1 device is 18.5 Ω, which
represents Rmdig = 1920 and an encoded Rm[6:0] value of 0x7Fh. The minimum resistor the DRV10983-Q1
device supports is 0.029 Ω, R_{PH_CT}, which represents Rmdig = 3.
For convenience, the encoded value for Rm[6:0] can also be obtained from Table 3.
RM[6:0] {RMShift[2:0],
RMValue[3:0]}
BINARY
HEX
000 0000
0x00
000 0001
0x01
000 0010
0x02
000 0011
0x03
000 0100
0x04
000 0101
0x05
000 0110
0x06
000 0111
0x07
000 1000
0x08
000 1001
0x09
000 1010
0x0A
000 1011
0x0B
000 1100
0x0C
000 1101
0x0D
000 1110
0x0E
000 1111
0x0F
001 1000
0x18
001 1001
0x19
001 1010
0x1A
001 1011
0x1B
001 1100
0x1C
001 1101
0x1D
001 1110
0x1E
001 1111
0x1F
Table 3. Motor Resistance Look-Up Table
R_{PH_CT} (Ω)
0
0.0097
0.0194
0.0291
0.0388
0.0485
0.0582
0.0679
0.0776
0.0873
0.097
0.1067
0.1164
0.1261
0.1358
0.1455
0.1552
0.1746
0.194
0.2134
0.2328
0.2522
0.2716
0.291
RM[6:0] {RMShift[2:0],
RMValue[3:0]}
BINARY
HEX
0101000
0x28
010 1001
0x29
010 1010
0x2A
010 1011
0x2B
010 1100
0x2C
010 1101
0x2D
010 1110
0x2E
010 1111
0x2F
011 1000
0x38
011 1001
0x39
011 1010
0x3A
011 1011
0x3B
011 1100
0x3C
011 1101
0x3D
011 1110
0x3E
011 1111
0x3F
100 1000
0x48
100 1001
0x49
100 1010
0x4A
100 1011
0x4B
100 1100
0x4C
100 1101
0x4D
100 1110
0x4E
100 1111
0x4F
R_{PH_CT} (Ω)
0.3104
0.3492
0.388
0.4268
0.4656
0.5044
0.5432
0.582
0.6208
0.6984
0.776
0.8536
0.9312
1.0088
1.0864
1.164
1.2416
1.3968
1.552
1.7072
1.8624
2.0176
2.1728
2.328
RM[6:0] {RMShift[2:0],
RMValue[3:0]}
BINARY
HEX
1011000
0x58
101 1001
0x59
101 1010
0x5A
101 1011
0x5B
101 1100
0x5C
101 1101
0x5D
101 1110
0x5E
101 1111
0x5F
110 1000
0x68
110 1001
0x69
110 1010
0x6A
110 1011
0x6B
110 1100
0x6C
110 1101
0x6D
110 1110
0x6E
110 1111
0x6F
111 1000
0x78
111 1001
0x79
111 1010
0x7A
111 1011
0x7B
111 1100
0x7C
111 1101
0x7D
111 1110
0x7E
111 1111
0x7F
R_{PH_CT} (Ω)
2.4832
2.7936
3.104
3.4144
3.7248
4.0352
4.3456
4.656
4.9664
5.5872
6.208
6.8288
7.4496
8.0704
8.6912
9.312
9.9328
11.1744
12.416
13.6576
14.8992
16.1408
17.3824
18.624
18
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