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MAX6439 Datasheet(PDF) 7 Page - Maxim Integrated Products

Part No. MAX6439
Description  Low-Power, Single-/Dual-Level 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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MAX6439 Datasheet(HTML) 7 Page - Maxim Integrated Products

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Detailed Description
The MAX6439–MAX6442 family is available with several
monitoring options. The factory-trimmed thresholds
eliminate the requirement for external components. The
MAX6439/MAX6440 have single low-battery outputs
and the MAX6441/MAX6442 have dual low-battery out-
puts (see Figure 1a and Figure 1b).
The MAX6439–MAX6442 combine a 1.23V 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 MAX6441/MAX6442
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. Factory-
trimmed 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
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
_______________________________________________________________________________________
7
Pin Description
PIN
MAX6439/
MAX6440
MAX6441/
MAX6442
NAME
FUNCTION
11
VBATT
Battery Voltage Input. Input for battery voltage threshold monitors and device power supply
if VBATT is greater than VCC.
23
MR
Manual Reset Input, Active-Low, Internal 1.5k
Ω Pullup to VCC. Pull low to assert a one-shot
edge-triggered RESET output 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.
3
LBO
Low-Battery Output, Active Low, Open Drain. LBO is asserted when VBATT drops below the
LTH specification and remains asserted until VBATT rises above the HTH specification for at
least 150ms.
45
RESET
Reset Output, Active Low, Push-Pull or Open Drain. RESET changes 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 MAX6439/MAX6441, and a push-pull output for the
MAX6440/MAX6442. The push-pull outputs are referenced to VCC. RESET is guaranteed to
be in the correct logic state for VBATT or VCC > 1.0V.
5
2
GND
Ground
68
VCC
VCC Voltage Input. Input for VCC reset threshold monitor and device power supply if VCC is
greater than VBATT.
6
LBOH
Low-Battery Output High, Active Low, Open Drain. LBOH is asserted when VBATT drops
below the HTH- specification. LBOH is deasserted when VBATT rises above the HTH+
specification for at least 150ms.
7
LBOL
Low-Battery Output Low, Active Low, Open Drain. LBOL is asserted when VBATT drops
below the LTH- specification. LBOL is deasserted when VBATT rises above the LTH+
specification for at least 150ms.
4
LBOLH
Low-Battery Output Low/High, Active Low, Open Drain. LBOLH is asserted when VBATT
drops below the LTH- specification. LBOLH is deasserted when VBATT rises above the
HTH+ specification for at least 150ms.


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