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MAX17040X+U Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX17040X+U Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 13 page Compact, Low-Cost 1S/2S Fuel Gauges _______________________________________________________________________________________ 5 SDA SCL tF tLOW tHD:STA tHD:DAT tSU:STA tSU:STO tSU:DAT tHD:STA tSP tR tBUF tR tF SSr P S Figure 1. 2-Wire Bus Timing Diagram Pin Description PIN UCSP TDFN NAME FUNCTION A1 8 SDA Serial Data Input/Output. Open-drain 2-wire data line. Connect this pin to the DATA signal of the 2-wire interface. This pin has a 0.2μA typical pulldown to sense disconnection. A2 7 SCL Serial Clock Input. Input only 2-wire clock line. Connect this pin to the CLOCK signal of the 2-wire interface. This pin has a 0.2μA typical pulldown to sense disconnection. A3 1 CTG Connect to Ground. Connect to VSS during normal operation. B1 6 EO External 32kHz Clocking Signal. Input for external clocking signal to be the primary system clock. Configured to implement interrupt feature with a pulldown set on SEO pin. B2 — N.C. No Connect. Do not connect. B3 2 CELL Battery-Voltage Input. The voltage of the cell pack is measured through this pin. C1 5 SEO External 32kHz Clocking Signal Enable Input. Input to enable external clocking signal on EO pin with a pullup state; a pulldown state to configure the interrupt feature. External 32kHz clock enable. Connects logic-low to enable external interrupt. C2 3 VDD Power-Supply Input. 2.5V to 4.5V input range. Connect to system power through a decoupling network. Connect a 10nF typical decoupling capacitor close to pin. C3 4 GND Ground. Connect to the negative power rail of the system. — — EP Exposed Pad (TDFN Only). Connect to ground. STATE MACHINE (SOC, RATE) 2-WIRE INTERFACE IC GROUND TIME BASE (32kHz) ADC (VCELL) VOLTAGE REFERENCE BIAS GND CELL VDD SCL SDA CTG SEO EO MAX17040 MAX17041 Figure 2. Block Diagram Detailed Description Figure 1 shows the 2-wire bus timing diagram, and Figure 2 is the MAX17040/MAX17041 block diagram. ModelGauge Theory of Operation The MAX17040/MAX17041 use a sophisticated battery model, which determines the SOC of a nonlinear Li+ battery. The model effectively simulates the internal dynamics of a Li+ battery and determines the SOC. The model considers the time effects of a battery caused by the chemical reactions and impedance in the battery. The MAX17040/MAX17041 SOC calculation does not accumulate error with time. This is advantageous |
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