MAX17040(2010) Просмотр технического описания (PDF) - Maxim Integrated
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MAX17040 Datasheet PDF : 13 Pages
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Compact, Low-Cost 1S/2S Fuel Gauges
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.
Table 2. MODE Register Command
VALUE
COMMAND
DESCRIPTION
4000h
Quick-Start 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
COMMAND
DESCRIPTION
5400h
POR
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 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.
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
VDD
Power directly from battery
Power directly from battery
Power directly from battery
MAX17040
Power directly from battery
MAX17041 Power from 2.5V to 4.5V LDO in pack
MAX17041 Power from 2.5V to 4.5V LDO or PMIC
MAX17041 Power from 2.5V to 4.5V LDO or PMIC
MAX17041 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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