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MAX17040G+U Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX17040G+U
Description  Compact, Low-Cost 1S/2S Fuel Gauges
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX17040G+U Datasheet(HTML) 8 Page - Maxim Integrated Products

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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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