MAX17040 데이터 시트보기 (PDF) - Maxim Integrated

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MAX17040

1-Cell/2-Cell Fuel Gauge with ModelGauge

Maxim Integrated 

MAX17040/MAX17041

1-Cell/2-Cell Fuel Gauge with ModelGauge

MODE Register

The MODE register allows the host processor to send

special commands to the IC (Figure 4). Valid MODE reg-

ister write values are listed as follows. All other MODE

register values are reserved. Table 2 shows the MODE

register command.

Table 2. MODE Register Command

VALUE

4000h

COMMAND

Quick-Start

DESCRIPTION

See the Quick-Start

description section.

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.

Table 3. COMMAND Register Command

VALUE

0054h

COMMAND

POR

DESCRIPTION

See the Power-On Reset

(POR) description section.

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 pow-

ered 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 system

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 gener-

ates a low-to-high transition on the EO pin to signal the

MAX17041 to perform a quick-start.

Table 4. Possible Application Configurations

SYSTEM CONFIGURATION

1S Pack-Side Location

1S Host-Side Location

1S Host-Side Location,

External Clocking

1S Host-Side Location,

Hardware Quick-Start

2S Pack-Side Location

2S Host-Side Location

2S Host-Side Location,

External Clocking

2S Host-Side Location,

Hardware Quick-Start

IC

MAX17040

MAX17040

MAX17040

MAX17040

MAX17041

MAX17041

MAX17041

MAX17041

VDD

Power directly from battery

Power directly from battery

Power directly from battery

Power directly from battery

Power from 2.5V to 4.5V LDO in pack

Power from 2.5V to 4.5V LDO or PMIC

Power from 2.5V to 4.5V LDO or PMIC

Power from 2.5V to 4.5V LDO or PMIC

SEO

Connect to GND

Connect to GND

Connect to VDD

Connect to GND

Connect to GND

Connect to GND

Connect to VDD

Connect to GND

EO

Connect to GND

Connect to GND

Connect to precision

32kHz clock source

Connect to rising-

edge reset signal

Connect to GND

Connect to GND

Connect to precision

32kHz clock source

Connect to rising-

edge reset signal

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