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MAX17049X+T10 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX17049X+T10 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 19 page ����������������������������������������������������������������� Maxim Integrated Products 9 MAX17048/MAX17049 Micropower 1-Cell/2-Cell Li+ ModelGauge ICs Battery Swap Detection If VCELL falls below VRST, the IC quick-starts when VCELL returns above VRST. This handles battery swap; the SOC of the previous battery does not affect that of the new one. See the Quick-Start and VRESET/ID Register (0x18) sections. Quick-Start If the IC generates an erroneous initial SOC, the battery insertion and system powerup voltage waveforms must be examined to determine if a quick-start is necessary, as well as the best time to execute the command. The IC samples the maximum VCELL during the first 17ms. See the Battery Insertion Debounce section. Unless VCELL is fully relaxed, even the best sampled voltage can appear greater or less than OCV. Therefore, quick-start must be used cautiously. Most systems should not use quick-start because the ICs handle most startup problems transparently, such as intermittent battery-terminal connection during insertion. If battery voltage stabilizes faster than 17ms, as illus- trated in Figure 6, then do not use quick-start. The quick-start command restarts fuel-gauge calcula- tions in the same manner as initial power-up of the IC. If the system power-up sequence is so noisy that the initial estimate of SOC has unacceptable error, the sys- tem microcontroller might be able to reduce the error by using quick-start. A quick-start is initiated by a rising edge on the QSTRT pin, or by writing 1 to the quick-start bit in the MODE register. Power-On Reset (POR) POR includes a quick-start, so only use it when the battery is fully relaxed. See the Quick-Start section. This command restores all registers to their default values. After this command, reload the custom model. See the CMD Register (0xFF) section. Hibernate Mode The ICs have a low-power hibernate mode that can accurately fuel gauge the battery when the charge/ discharge rate is low. By default, the device automati- cally enters and exits the hibernate mode according to the charge/discharge rate, which minimizes quiescent current (below 5FA) without compromising fuel-gauge accuracy. The ICs can be forced into hibernate or active modes. Force the IC into hibernate mode to reduce power consumption in applications with less than C/4-rate maximum loading. For applications with higher loading, Maxim recommends the default configuration of automatic control of hibernate mode. In hibernate mode, the device reduces its ADC conver- sion period and SOC update to once per 45s. See the HIBRT Register (0x0A) section for details on how the IC automatically enters and exits hibernate mode. Figure 6. Insertion Waveform Not Requiring Quick-Start Command Figure 7. Insertion Waveform Requiring Quick-Start Command STEADY SYSTEM LOAD BEGINS VCELL HAS FULLY RELAXED TIME VCELL INITIAL SAMPLE DEBOUNCE WINDOW TIME VCELL INITIAL SAMPLE DEBOUNCE WINDOW QUICK-START DURING THIS TIME SPAN STEADY SYSTEM LOAD BEGINS BEST TIME TO QUICK-START VCELL HAS FULLY RELAXED |
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