MAX17040(2010) 查看數據表（PDF） - Maxim Integrated

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MAX17040
(Rev.:2010)

Compact, Low-Cost 1S/2S Fuel Gauges

Maxim Integrated 

Compact, Low-Cost 1S/2S Fuel Gauges

Pin Description

PIN

NAME

FUNCTION

1

CTG

Connect to Ground. Connect to VSS during normal operation.

2

CELL

Battery Voltage Input. The voltage of the cell pack is measured through this pin.

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.

4

GND

Ground. Connect to the negative power rail of the system.

External 32kHz Clocking Signal Enable Input. Input to enable external clocking signal on EO pin

5

SEO

with a pullup state. A pulldown state to configure the interrupt feature. External 32kHz clock

enable. Connects logic-low to enable external interrupt.

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.

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.

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.

—

EP

Exposed Pad. Connect PD to ground.

SDA

tF

tF

tSU:DAT

tLOW

tR

tHD:STA

tSP

tR

tBUF

SCL

tHD:STA

S

tHD:DAT

Figure 1. 2-Wire Bus Timing Diagram

VDD

BIAS

TIME BASE

(32kHz)

VOLTAGE

REFERENCE

ADC (VCELL)

MAX17040

MAX17041

STATE

MACHINE

(SOC, RATE)

CELL

IC

GND

GROUND

2-WIRE

INTERFACE

Figure 2. Block Diagram

tSU:STA

Sr

tSU:STO

P

S

Detailed Description

Figure 1 shows the 2-wire bus timing diagram, and

EO

Figure 2 is the MAX17040/MAX17041 block diagram.

SEO

ModelGauge Theory of Operation

CTG

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

SDA

model considers the time effects of a battery caused by

SCL

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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