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MAX17040G+U Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX17040G+U Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 13 page Compact, Low-Cost 1S/2S Fuel Gauges 8 _______________________________________________________________________________________ MODE Register The MODE register allows the host processor to send special commands to the IC (Figure 4). Valid MODE register write values are listed as follows. All other MODE register values are reserved. Table 2 shows the MODE register command. VERSION Register The VERSION register is a read-only register that con- tains a value indicating the production version of the MAX17040/MAX17041. RCOMP Register RCOMP is a 16-bit value used to compensate the ModelGauge algorithm. RCOMP can be adjusted to optimize performance for different lithium chemistries or different operating temperatures. Contact Maxim for instructions for optimization. The factory-default value for RCOMP is 9700h. COMMAND Register The COMMAND register allows the host processor to send special commands to the IC. Valid COMMAND register write values are listed as follows. All other COMMAND register values are reserved. Table 3 shows the COMMAND register command. Application Examples The MAX17040/MAX17041 have a variety of configura- tions, depending on the application. Table 4 shows the most common system configurations and the proper pin connections for each. Figure 5 shows an example application for a 1S cell pack. The MAX17040 is mounted on the system side and powered directly from the cell pack. The external RC networks on VDD and CELL provide noise filtering of the IC power supply and A/D measurement. In this example, the SEO pin is connected to VDD to allow an external clock and reduce power usage by the MAX17040. The system’s 32kHz clock is connected to the EO input pin. Figure 6 shows a MAX17041 example application using a 2S cell pack. The MAX17041 is mounted on the sys- tem side and powered from a 3.3V supply generated by the system. The CELL pin is still connected directly to PACK+ through an external noise filter. The SEO pin is connected low to allow the system hardware to reset the fuel gauge. After power is supplied, the system watchdog generates a low-to-high transition on the EO pin to signal the MAX17041 to perform a quick-start. VALUE COMMAND DESCRIPTION 4000h Quick-Start See the Quick-Start description section. Table 2. MODE Register Command VALUE COMMAND DESCRIPTION 5400h POR See the Power-On Reset (POR) description section. Table 3. COMMAND Register Command SYSTEM CONFIGURATION IC VDD SEO EO 1S Pack-Side Location MAX17040 Power directly from battery Connect to GND Connect to GND 1S Host-Side Location MAX17040 Power directly from battery Connect to GND Connect to GND 1S Host-Side Location, External Clocking MAX17040 Power directly from battery Connect to VDD Connect to precision 32kHz clock source 1S Host-Side Location, Hardware Quick-Start MAX17040 Power directly from battery Connect to GND Connect to rising- edge reset signal 2S Pack-Side Location MAX17041 Power from 2.5V to 4.5V LDO in pack Connect to GND Connect to GND 2S Host-Side Location MAX17041 Power from 2.5V to 4.5V LDO or PMIC Connect to GND Connect to GND 2S Host-Side Location, External Clocking MAX17041 Power from 2.5V to 4.5V LDO or PMIC Connect to VDD Connect to precision 32kHz clock source 2S Host-Side Location, Hardware Quick-Start MAX17041 Power from 2.5V to 4.5V LDO or PMIC Connect to GND Connect to rising- edge reset signal Table 4. Possible Application Configurations |
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