|
|
PDF MAX6440UTP Data sheet ( Hoja de datos )
| Número de pieza | MAX6440UTP | |
| Descripción | Low-Power / Single-/Dual-Level Battery Monitors with Hysteresis and Integrated P Reset | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX6440UTP (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
19-2535; Rev 0; 7/02
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
General Description
The MAX6439–MAX6442 are a family of ultra-low-power
battery monitors with integrated microprocessor (µP)
supervisors. The battery monitors are offered with sin-
gle or dual low-battery output options that can be used
to signal when the battery is OK (enabling full system
operation), when the battery is low (for low-power sys-
tem operation), and when the battery is dead (to dis-
able system operation). These devices also have an
independent µP supervisor that monitors VCC and pro-
vides an active-low reset output. A manual reset func-
tion is available to reset the µP with a push-button. No
external components are required.
The MAX6439–MAX6442 are offered with several facto-
ry-trimmed low-battery threshold combinations ideal for
single-cell lithium-ion (Li+) or multicell alkaline/NiCd/
NiMH applications. When the battery voltage drops
below each specified low threshold, the low-battery out-
puts are asserted to alert the system. When the voltage
rises above the specified high thresholds, the outputs
are deasserted after a 150ms minimum timeout period,
ensuring the voltages have stabilized before power cir-
cuitry is activated or providing microprocessor reset tim-
ing. The low and high thresholds provide hysteresis in
battery-operated systems to eliminate output chattering.
The MAX6439/MAX6440 offer factory-trimmed battery
monitors with a single output. The MAX6441/MAX6442
offer factory-trimmed battery monitors with dual outputs.
All battery monitors have open-drain low-battery outputs.
The MAX6439–MAX6442 monitor system voltages
(VCC) from 1.8V to 3.3V with seven fixed reset threshold
options. Each device is offered with two minimum reset
timeout periods of 150ms or 1200ms. The MAX6439/
MAX6441 are offered with an open-drain RESET output
and the MAX6440/MAX6442 are offered with a push-
pull RESET output.
The MAX6439–MAX6442 are offered in a SOT23 pack-
age and are fully specified over a -40°C to +85°C temp-
erature range.
Applications
Battery-Powered Systems (Single-Cell Li+ or
Two-/Three-Cell NiMH, NiCd, Alkaline)
Cell Phones/Cordless Phones
Portable Medical Devices
Electronic Toys
Pagers
PDAs
MP3 Players
Features
o Factory-Trimmed VBATT Threshold Options for
Monitoring Single-Cell Li+ or Multicell
Alkaline/NiCd/NiMH Applications
o Immune to Short Battery Voltage Transients
o Low Current (2.5µA typ at 3.6V)
o Single and Dual Low-Battery Output Options
o 150ms Minimum LBO Timeout Period
o Independent µP Reset with Manual Reset
o Factory-Set Reset Thresholds for Monitoring VCC
from 1.8V to 3.3V
o Available with 150ms (min) and 1.2s (min) VCC
Reset Timeout Period Options
o -40°C to +85°C Operating Temperature Range
o Small 6- and 8-Pin SOT23 Packages
o No External Components
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6439UT_ _ _D_-T -40°C to +85°C 6 SOT23-6
MAX6440UT_ _ _D_-T -40°C to +85°C 6 SOT23-6
MAX6441KA_ _ _D_-T -40°C to +85°C 8 SOT23-8
MAX6442KA_ _ _D_-T -40°C to +85°C 8 SOT23-8
Note: The first two “_ _” are placeholders for the battery moni-
tor voltage levels. Desired threshold levels are set by the part
number suffix found in Tables 1 and 2. The third “_” is the VCC
reset threshold level suffix found in Table 3. The “_” after the D
is a placeholder for the reset timeout period suffix found in
Table 4. All devices are available in tape-and-reel only. There
is a 2500-piece minimum order increment for standard ver-
sions. Sample stock is typically held on standard versions only.
Nonstandard versions require a minimum order increment of
10,000 pieces. Contact factory for availability.
Pin Configurations
TOP VIEW
VBATT 1
6 VCC
MAX6439
MR 2 MAX6440 5 GND
LBO 3
4 RESET
SOT23-6
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 1.2V to 5.5V, VCC = 1.2V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
RESET Output High
(Push-Pull)
VOH
VCC ≥ 1.53V, ISOURCE = 100µA, RESET
deasserted
VCC ≥ 2.55V, ISOURCE = 500µA, RESET
deasserted
0.8 x VCC
0.8 x VCC
V
RESET Output Low
VCC ≥ 1.0V, ISINK = 50µA, RESET asserted
VOL VCC ≥ 1.2V, ISINK = 100µA, RESET asserted
VCC ≥ 2.12V, ISINK = 1.2mA, RESET
asserted
0.3
0.3
V
0.3
RESET Output Leakage Current
(Open Drain)
RESET deasserted
500 nA
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design only.
Note 2: The device is powered up by the highest voltage between VBATT and VCC.
Note 3: MR input ignores falling input pulses, which occur within the MR debounce period (tDEB) after a valid MR reset assertion.
This prevents invalid reset assertion due to switch bounce.
Typical Operating Characteristics
(VBATT = 1.2V to 5.5V, VCC = 1.2V to 5.5V, unless otherwise specified. Typical values are at TA = +25°C.)
SUPPLY CURRENT vs. TEMPERATURE
VCC = 3.3V, VBATT = 3.6V
4
NORMALIZED LBO TIMEOUT PERIOD
vs. TEMPERATURE
1.10
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
1.015
3
TOTAL
2
1
IBATT
ICC
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
1.05
1.00
0.95
0.90
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
1.010
1.005
1.000
0.995
0.990
0.985
0.980
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
_______________________________________________________________________________________ 5
5 Page 
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Table 1. Factory-Trimmed Lower and Upper Threshold Combinations for Single-Cell Li+
or Three-Cell Alkaline/NiCd/NiMH Applications
LOWER
THRESHOLD
(LTH)
VOLTAGES
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
3.3V
AG
BG
CG
DG
EG
FG
UPPER THRESHOLD (HTH)
3.4V
3.5V
AH AI
BH BI
CH CI
DH DI
EH EI
FH FI
3.6V
AJ
BJ
CJ
DJ
EJ
FJ
Table 2. Factory-Trimmed Lower and Upper Threshold Combinations for Two-Cell
Alkaline/NiCd/NiMH Applications
LOWER
THRESHOLD
(LTH)
VOLTAGES
1.6V
1.7V
1.8V
1.9V
2.0V
2.1V
2.3V
KQ
LQ
MQ
NQ
OQ
PQ
UPPER THRESHOLD (HTH)
2.4V
2.5V
KR KS
LR LS
MR MS
NR NS
OR OS
PR PS
2.6V
KT
LT
MT
NT
OT
PT
Table 3. Factory-Trimmed VCC Reset
Threshold Levels
PART NO.
SUFFIX
(_)
VCC NOMINAL
RESET
THRESHOLD (V)
T 3.075
S 2.925
R 2.625
Z 2.313
Y 2.188
W 1.665
V 1.575
DC-to-DC Converter Application
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
Table 4. VCC Reset Timeout Period Suffix
Guide
TIMEOUT
PERIOD SUFFIX
D3
D7
ACTIVE TIMEOUT PERIOD (ms)
MIN MAX
150 300
1200
2400
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
VLTH+ (see Figure 7).
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX6440UTP.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX6440UT | Low-Power / Single-/Dual-Level Battery Monitors with Hysteresis and Integrated P Reset | Maxim Integrated |
| MAX6440UTA | Low-Power / Single-/Dual-Level Battery Monitors with Hysteresis and Integrated P Reset | Maxim Integrated |
| MAX6440UTB | Low-Power / Single-/Dual-Level Battery Monitors with Hysteresis and Integrated P Reset | Maxim Integrated |
| MAX6440UTC | Low-Power / Single-/Dual-Level Battery Monitors with Hysteresis and Integrated P Reset | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |