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BQ26150 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ26150 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 16 page www.ti.com x0 P14 x1 P13 x2 P12 x3 P11 x4 P10 x5 P9 x6 P8 x7 P7 x8 P6 x9 P5 x10 P4 x11 P3 x12 P2 x13 P1 x14 P0 x15 INPUT (lsb first) AV[15] AV[14] AV[13] AV[12] AV[11] AV[10] AV[9] AV[8] AV[0] AV[1] AV[2] AV[3] AV[4] AV[5] AV[6] AV[7] bq26150 SLUS641A – JANUARY 2005 – REVISED JULY 2005 Figure 3. bq26150 Programmable CRC Hardware Implementation The generic polynomial used in the bq26150 can be written as: 1+P14x 1+P 13x 2+ 12x 3+P 11x 4+P 10x 5+P 9x 6+P 8x 7+P 7x 8P 6x 9+P 5x 10+ 4x 11+P 3x 12+P 2x 13+P 1x 14+P 0x 15+x16 Figure 3 shows the hardware implementation of the CRC, with the corresponding bits of the authentication value shown below each stage of the shift register. This configuration assumes that the x0 term coefficient, which is P15, is always 1, which was stated as an assumption of a normal CRC polynomial. This means that there are 2 15, or 32768, possible CRC polynomial values. In actually, the number of possible CRC polynomial will be less than 32758 because some values, such as all 0, do not provide sufficient mixing of the results to be secure. To authenticate a battery pack using the bq26150, the host must reproduce the CRC calculation in software. This is done by reading the encrypted device ID and encrypted polynomial coefficients, and encrypted seed. All values are decrypted by the host to provide the 16-bit polynomial, 16-bit seed, and 96 of the 128 bits of calculation’s input. The CRC input is: Device ID [95:0] Random Challenge [31:0] Input MSB Input LSB 9 |
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