MAX6439UTA MAXIM [Maxim Integrated Products], MAX6439UTA Datasheet - Page 11

• Manufacturer Part Number: MAX6439UTA
• Description: Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated uP Reset
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 1. Factory-Trimmed Lower and Upper Threshold Combinations for Single-Cell Li+
or Three-Cell Alkaline/NiCd/NiMH Applications
Table 2. Factory-Trimmed Lower and Upper Threshold Combinations for Two-Cell
Alkaline/NiCd/NiMH Applications
Table 3. Factory-Trimmed V
Threshold Levels
The MAX6441/MAX6442 triple-output battery monitors
can be used in conjunction with a DC-to-DC converter
to power microprocessor systems using a single Li+
cell or two to three alkaline/NiCd/NiMH cells. The LBOH
output indicates that the battery voltage is weak, and is
used to warn the microprocessor of potential problems.
Armed with this information, the microprocessor can
Low-Power, Single-/Dual-Level Battery Monitors
THRESHOLD
THRESHOLD
LOWER
LOWER
(LTH)
(LTH)
PART NO.
SUFFIX
( _ )
W
R
T
S
Z
Y
V
DC-to-DC Converter Application
with Hysteresis and Integrated µP Reset
______________________________________________________________________________________
VOLTAGES
VOLTAGES
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
1.6V
1.7V
1.8V
1.9V
2.0V
2.1V
THRESHOLD (V)
V
CC
CC
RESET
NOMINAL
3.075
2.925
2.625
2.313
2.188
1.665
1.575
Reset
3.3V
2.3V
MQ
OQ
AG
BG
CG
DG
KQ
NQ
EG
FG
LQ
PQ
reduce system power consumption. The LBOL output
indicates the battery is empty, and system power
should be disabled. By connecting LBOL to the SHDN
pin of the DC-to-DC converter, power to the microproces-
sor is removed. Microprocessor power does not return
until the battery has recharged to a voltage greater than
V
Table 4. V
Guide
UPPER THRESHOLD (HTH)
UPPER THRESHOLD (HTH)
3.4V
2.4V
LTH+
MR
OR
AH
BH
CH
DH
EH
KR
NR
PR
FH
LR
PERIOD SUFFIX
TIMEOUT
(see Figure 7).
D3
D7
CC
Reset Timeout Period Suffix
2.5V
3.5V
MS
NS
OS
KS
LS
PS
AI
BI
CI
DI
EI
FI
ACTIVE TIMEOUT PERIOD (ms)
1200
MIN
150
3.6V
2.6V
MT
OT
CJ
DJ
KT
NT
PT
AJ
BJ
EJ
FJ
LT
MAX
2400
300
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