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L9963E 数据表(PDF) 45 Page - STMicroelectronics |
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L9963E 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 184 page  4.6 Cell current measurement The current flowing into the external shunt resistance RSENSE is measured through a differential amplifier stage (connected between ISENSEP/ISENSEM pins) feeding a 18 bits ADC. The current conversion chain can be enabled through the CoulombCounter_en bit and runs in background to perform the Coulomb Counting Routine. Moreover, L9963E also allows to synchronize the Voltage Conversion Routine and the Coulomb Counting Routine for a precise State Of Charge estimation. Everytime an on-demand voltage conversion is requested by setting SOC = 1, the actual conversion start is delayed until the first useful current conversion takes place. This might result in a maximum delay of TCYCLEADC_CUR, that must be taken into account by user SW only in case current ADC is enabled. Synchronized current sample is available into the CUR_INST_Synch. 4.6.1 Cell current ADC In the typical application, the current measurement is performed by detecting the voltage drop on a shunt resistor RSENSE with a value of 0.1 mΩ, with a current range of +/-1500 A. By changing the value of the shunt resistance, it is possible to cover different current ranges. The architecture includes an ADC that converts ISENSEP-ISENSEM voltage information into a digital value. The input range of current measurement is set from -1500 A to +1500 A. In the range of [-600 A, +600 A], a constant error value of ±3 A (which is 600 A × ±5‰) is set to avoid the unlimited small error near the zero current. In the range of [-1500 A, -600 A) and (+600 A, +1500 A], the accuracy of ±5‰ is chosen. Converted value is available in CUR_INST_calib register and follows 2’s complement notation. Cell current can be calculated according to the following formula: Cell current measurement VISENSE=BINARY_CODE2′s complement×VISENSE_RES ICELL=VISENSE RSHUNT (4) 4.6.2 Electrical parameters All parameters are tested and guaranteed in the following conditions, unless otherwise noted: 9.6 V < VBAT < 64 V; -40 °C < Tambient < 105 °C; Shift between AGND,DGND,CGND,GNDREF below +/-100 mV Table 41. Current measurement electrical parameters Symbol Parameter Test conditions Min. Typ. Max. Unit Freq_CURR_MEAS Frequency of input voltage Not tested, design info 1 kHz TCYCLEADC_CUR Conversion Time for Cyclic Wakeup state operation Not tested, design info 328.25 µs ICELL Current Input Measurement Range Application only, not to be tested (Rshunt = 0.1 mΩ) -1500 1500 A IISENSEP ISENSEP input current ISENSEP = 0 mV -140 -70 -30 μA IISENSEM ISENSEM input current ISENSEM = 0 mV -140 -70 -30 μA IISENSE_DIF ISENSE differential current -1 1 μA IISENSEP_LEAK ISENSEP input leakage current ISENSEP = 3.3V 300 nA IISENSEM_LEAK ISENSEM input leakage current ISENSEM = 3.3V 300 nA L9963E Cell current measurement DS13636 - Rev 12 page 45/184 |
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