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ADBMS1818ASWZ-R7 数据表(PDF) 28 Page - Analog Devices |
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ADBMS1818ASWZ-R7 数据表(HTML) 28 Page - Analog Devices |
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28 / 89 page  Data Sheet ADBMS1818 THEORY OF OPERATION analog.com Rev. 0 | 28 of 89 Auxiliary (GPIO) Measurements with Digital Redundancy (ADAXD Command) The ADAXD command operates similarly to the ADAX command except that an additional diagnostic is performed using digital re- dundancy. PS, Bits[1:0] in Configuration Register Group B must be set to 0 or 1 during the ADAXD command to enable redundancy. See the ADC Conversion with Digital Redundancy section. The execution time of the ADAX command and the ADAXD com- mand is the same. Measuring Cell Voltages and GPIOs (ADCVAX Command) The ADCVAX command combines 18 cell measurements with 2 GPIO measurements (GPIO1 and GPIO2). This command simpli- fies the synchronization of battery cell voltage and current measure- ments when current sensors are connected to the GPIO1 or GPIO2 inputs. Figure 58 shows the timing of the ADCVAX command. See the Commands section for the ADCVAX command format. The synchronization of the current and voltage measurements, tSKEW1, in fast mode is within 194 μs. Table 22 shows the conversion and synchronization time for the ADCVAX command in different modes. The total conversion time for the command is given by t8C. Figure 58. Timing of ADCVAX Command Table 22. Conversion and Synchronization Times for ADCVAX Command in Different Modes Mode Conversion Times (μs) Synchronization Time (μs) t0 t1M t2M t3M t4M t5M t6M t7M t8M t8C tSKEW1 27 kHz 0 58 104 151 205 252 306 352 399 1511 194 14 kHz 0 87 163 238 321 397 480 556 632 1744 310 7 kHz 0 145 279 413 554 688 829 963 1097 3140 543 3 kHz 0 261 512 762 1020 1270 1527 1778 2028 4071 1008 2 kHz 0 494 977 1460 1,950 2433 2924 3407 3890 5933 1939 1 kHz 0 960 1908 2857 3812 4761 5717 6665 7613 9657 3801 422 Hz 0 1890 3770 5649 7536 9415 11,302 13,181 15,061 17,104 7525 26 Hz 0 29,818 59,624 89,431 119,245 149,052 178,866 208,672 238,479 268,450 119,234 |
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