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MAX17044X+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX17044X+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 14 page Compact, Low-Cost 1S/2S Fuel Gauges with Low-Battery Alert 9 SLEEP (Sleep Bit) Writing SLEEP to logic 1 forces the ICs into Sleep mode. Writing SLEEP to logic 0 forces the ICs to exit Sleep mode. The power-up default value for SLEEP is logic 0. X (Don't Care) This bit reads as either a logic 0 or logic 1. This bit cannot be written. ALRT (ALERT Flag) This bit is set by the IC when the SOC register value falls below the alert threshold setting and an interrupt is generated. This bit can only be cleared by software. The power-up default value for ALRT is logic 0. ATHD (Alert Threshold) The alert threshold is a 5-bit value that sets the state of charge level where an interrupt is generated on the ALRT pin. The alert threshold has an LSb weight of 1% and can be programmed from 1% up to 32%. The threshold value is stored in two’s-complement form (00000 = 32%, 00001 = 31%, 00010 = 30%, 11111 = 1%). The power-up default value for ATHD is 4% or 1Ch. 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 COMMAND register commands. Application Examples The MAX17043/MAX17044 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. VALUE COMMAND DESCRIPTION 5400h POR See the Power-On Reset (POR) section. Table 3. COMMAND Register Commands SYSTEM CONFIGURATION IC VDD ALRT QSTRT 1S Pack-Side Location MAX17043 Power directly from battery Leave unconnected Connect to GND 1S Host-Side Location MAX17043 Power directly from battery Leave unconnected Connect to GND 1S Host-Side Location, Low Cell Interrupt MAX17043 Power directly from battery Connect to system interrupt Connect to GND 1S Host-Side Location, Hardware Quick-Start MAX17043 Power directly from battery Leave unconnected Connect to rising-edge reset signal 2S Pack-Side Location MAX17044 Power from +2.5V to +4.5V LDO in pack Leave unconnected Connect to GND 2S Host-Side Location MAX17044 Power from +2.5V to +4.5V LDO or PMIC Leave unconnected Connect to GND 2S Host-Side Location, Low Cell Interrupt MAX17044 Power from +2.5V to +4.5V LDO or PMIC Connect to system interrupt Connect to GND 2S Host-Side Location, Hardware Quick-Start MAX17044 Power from +2.5V to +4.5V LDO or PMIC Leave unconnected Connect to rising-edge reset signal Table 4. Possible Application Configurations Figure 5. CONFIG Register Format MSB—ADDRESS 0Ch LSB—ADDRESS 0Dh RCOMP 27 RCOMP 26 RCOMP 25 RCOMP 24 RCOMP 23 RCOMP 22 RCOMP 21 RCOMP 20 SLEEP X ALRT ATHD 24 ATHD 23 ATHD 22 ATHD 21 ATHD 20 MSB LSB MSB LSB ATHD UNITS: 1 LSB = 2’S COMPLEMENT 1% ATHD RANGE: 11111b = 1% 00000b = 32% |
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