MAX17059EVKIT# Maxim Integrated, MAX17059EVKIT# Datasheet - Page 9

• Manufacturer Part Number: MAX17059EVKIT#
• Description: Power Management IC Development Tools MAX17059 Eval Kit
• Manufacturer: Maxim Integrated
• Series: MAX17058, MAX17059r

Specifications of MAX17059EVKIT#

• Part # Aliases: 90-BCA1K#E00

If V
quick-starts. This handles the battery swap; the SOC of
the previous battery doesn not affect that of the new one.
See the
If the IC generates an erroneous initial SOC, the bat-
tery insertion and system power-up waveforms must
be examined to determine if a quick-start is necessary,
as well as the best time to execute the command. The
IC samples the maximum V
(see the
relaxed, even the best sampled voltage can appear
greater or less than OCV. Therefore, quick-start must be
used cautiously.
Most systems should not use quick-start because the
ICs handle most startup problems transparently, such
as intermittent battery-terminal connection during inser-
tion. If battery voltage stabilizes faster than 17ms, as
illustrated in
The quick-start command restarts fuel-gauge calcula-
tions in the same manner as initial power-up of the IC.
If the system power-up sequence is so noisy that the initial
estimate of SOC has unacceptable error, the system
microcontroller might be able to reduce the error by
using quick-start. A quick-start is initiated by a rising
edge on the QSTRT pin, or by writing 1 to the quick-start
bit on the MODE register.
Figure 6. Insertion Waveform Not Requiring Quick-Start
Command
CELL
Quick-Start
V
INITIAL SAMPLE DEBOUNCE WINDOW
V
falls below V
Battery Insertion
CELL
CELL
HAS FULLY RELAXED
Figure
and
6, then do not use quick-start.
RST
VRESET Register (0x18)
then returns above V
section). Unless V
17ms
CELL
Battery-Swap Detection
during the first 17ms
STEADY SYSTEM
LOAD BEGINS
Quick-Start
1-Cell /2-Cell Li+ ModelGauge ICs
CELL
TIME
RST
sections.
, the IC
is fully
Figure 7
initial SOC. If the disturbance is severe, quick-start after
the inrush current has stopped and voltage has settled,
but before the system is fully powered. If issued too soon
or too late, a quick-start causes SOC error.
Large inrush current might reduce V
initial sampling period. Issue a quick-start so that V
is nearest OCV during the 17ms following the command.
If the IC remains powered by a charger when the cell is
removed, then it continues to measure the charge volt-
age even though the cell is not present. When the cell is
reinserted, quick-start before the charger affects V
POR includes a quick-start, so only use it for when
a quick-start is safe (see the
This command restores all registers to their default
values. After this command, reload the custom model.
See the
The ICs can interrupt a system microcontroller when
SOC becomes low. See the
and
triggered, the IC asserts the ALRT pin logic-low and sets
CONFIG.ALRT = 1. The ALRT pin remains logic-low until
the system writes CONFIG.ALRT = 0 to clear the alert.
The alert function is enabled by default and can occur
immediately upon power-up. Entering sleep mode does
not clear the ALRT bit or the ALRT pin.
Figure 7. Insertion Waveform Requiring Quick-Start Command
V
CELL
DEBOUNCE WINDOW
STATUS Register (0x1A)
INITIAL SAMPLE
MAX17058 /MAX17059
CMD Register (0xFE)
illustrates a waveform that could corrupt the
17ms
FULLY RELAXED
QUICK-START DURING
BEST TIME TO
QUICK-START
Power-On Reset (POR)
THIS TIME SPAN
V CELL HAS
sections. When the alert is
section.
CONFIG Register (0x0C)
Quick-Start
CELL
Alert Interrupt
longer than the
STEADY SYSTEM
LOAD BEGINS
TIME
section).
CELL
CELL
.
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