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MAX6846 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX6846
Description  Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated UP Reset
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6846 Datasheet(HTML) 6 Page - Maxim Integrated Products

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Low-Power, Adjustable Battery Monitors with
Hysteresis and Integrated µP Reset
6
_______________________________________________________________________________________
Detailed Description
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-
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 VCC and provides an active-low reset out-
put. A manual reset function is available to allow the
user to reset the µP with a pushbutton.
Pin Description
PIN
MAX6846/MAX6847
MAX6848/MAX6849
NAME
FUNCTION
11
VDD
VDD Supply. Device power supply if VDD is greater than VCC.
2
2
GND
Ground
3
3
LTHIN
LTH Threshold Monitor Input. A resistor-divider network sets the low
threshold associated with
LBOL and LBO.
4
LBO
Low-Battery Output, Active-Low, Open-Drain.
LBO is asserted when LTHIN
drops below the VLTH specification and remains asserted until HTHIN rises
above the VHTH specification for at least 150ms.
55
RESET
Reset Output, Active-Low, Push-Pull, or Open-Drain.
RESET goes from high
to low when the VCC input drops below the selected reset threshold and
remains low for the VCC reset timeout period after VCC exceeds the reset
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 VCC. RESET
is guaranteed to be in the correct logic state for VDD or VCC
≥ 10V.
6
MR
Manual Reset Input, Active-Low, Internal 1.5k
Ω Pullup to VCC. Pull MR low
to assert a one-shot reset output pulse for the
MR reset timeout period.
Leave unconnected or connect to VCC if unused. The MR input is
debounced for
MR rising edges to prevent false reset events.
7
7
HTHIN
HTH Threshold Monitor Input. A resistor-divider network sets the high
threshold associated with
LBOH and LBO.
88
VCC
VCC Voltage Input. Input for VCC reset threshold monitor and device power
supply if VCC is greater than VDD.
6
LBOH
Low-Battery Output High, Active-Low, Open-Drain.
LBOH is asserted when
HTHIN drops below the VHTH- specification. LBOH is deasserted when
HTHIN rises above the VHTH+ specification for at least 150ms.
4
LBOL
Low-Battery Output Low, Active-Low, Open-Drain.
LBOL is asserted when
LTHIN drops below the VLTH- specification. LBOL is deasserted when
LTHIN rises above the VLTH+ specification for at least 150ms.


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