MAX6848KAZD7-T Maxim Integrated, MAX6848KAZD7-T Datasheet - Page 6

• Manufacturer Part Number: MAX6848KAZD7-T
• Description: Battery Management
• Manufacturer: Maxim Integrated
• Series: MAX6846, MAX6847, MAX6848, MAX6849r

Specifications of MAX6848KAZD7-T

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: SOT-23

The MAX6846–MAX6849 family is available with several
monitoring options. The MAX6846/MAX6847 have single
low-battery outputs and the MAX6848/MAX6849 have
dual low-battery outputs (see Figures 1a and 1b).
The MAX6846–MAX6849 combine a 615mV reference
with two comparators, logic, and timing circuitry to pro-
vide the user with information about the charge state of
the power-supply batteries. The MAX6848/MAX6849
monitor separate high-voltage and low-voltage thresh-
olds to determine battery status. The output(s) can be
used to signal when the battery is charged, when the
battery is low, and when the battery is empty. User-
Low-Power, Adjustable Battery Monitors with
Hysteresis and Integrated µP Reset
6
MAX6846/MAX6847 MAX6848/MAX6849
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1
2
3
4
5
6
7
8
PIN
Detailed Description
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1
2
3
5
7
8
6
4
RESET
NAME
HTHIN
LTHIN
LBOH
LBOL
GND
LBO
V
V
MR
DD
CC
V
Ground
LTH Threshold Monitor Input. A resistor-divider network sets the low
threshold associated with LBOL and LBO.
Low-Battery Output, Active-Low, Open-Drain. LBO is asserted when LTHIN
drops below the V
above the V
Reset Output, Active-Low, Push-Pull, or Open-Drain. RESET goes from high
to low when the V
remains low for the V
threshold. RESET is one-shot edge-trigger pulsed low for the MR reset
timeout period when the MR input is pulled low. RESET is an open-drain
output for the MAX6846/MAX6848, and a push-pull output for the
MAX6847/MAX6849. The push-pull outputs are referenced to V
is guaranteed to be in the correct logic state for V
Manual Reset Input, Active-Low, Internal 1.5kΩ Pullup to V
to assert a one-shot reset output pulse for the MR reset timeout period.
Leave unconnected or connect to V
debounced for MR rising edges to prevent false reset events.
HTH Threshold Monitor Input. A resistor-divider network sets the high
threshold associated with LBOH and LBO.
V
supply if V
Low-Battery Output High, Active-Low, Open-Drain. LBOH is asserted when
HTHIN drops below the V
HTHIN rises above the V
Low-Battery Output Low, Active-Low, Open-Drain. LBOL is asserted when
LTHIN drops below the V
LTHIN rises above the V
DD
CC
Supply. Device power supply if V
Voltage Input. Input for V
CC
HTH
adjustable thresholds are ideal for monitoring single-
cell Li+ or multicell alkaline/NiCd/NiMH power supplies.
When the power-supply voltage drops below the speci-
fied low threshold, the low-battery output asserts. When
the voltage rises above the specified high threshold fol-
lowing a 150ms (min) timeout period, the low-battery
output is deasserted. This ensures the supply voltage
has stabilized before power-converter or microproces-
sor activity is enabled.
These devices also have an independent µP supervisor
that monitors V
put. A manual reset function is available to allow the
user to reset the µP with a pushbutton.
is greater than V
specification for at least 150ms.
CC
LTH
CC
input drops below the selected reset threshold and
specification and remains asserted until HTHIN rises
reset timeout period after V
LTH+
HTH+
LTH-
HTH-
CC
specification for at least 150ms.
CC
specification. LBOL is deasserted when
DD
specification for at least 150ms.
specification. LBOH is deasserted when
FUNCTION
reset threshold monitor and device power
.
and provides an active-low reset out-
CC
DD
if unused. The MR input is
is greater than V
Pin Description
DD
CC
or V
exceeds the reset
CC
CC
CC
≥ 10V.
.
. Pull MR low
CC
. RESET