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參數(shù)資料
| 型號： | MAX6440UTBHVD7-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Low-Power Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µ.P Reset |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 235K |
| 代理商： | MAX6440UTBHVD7-T |
M
has stabilized before power-converter or microproces-
sor activity is enabled.
These devices also have an independent μP supervisor
that monitors V
CC
and provides an active-low reset out-
put. A manual reset function is available to allow the
user to reset the μP with a push-button.
Low-Battery Output
The low-battery outputs are available in active-low
(
LBO
,
LBOL
,
LBOH
,
LBOLH
), open-drain configura-
tions. The low-battery outputs can be pulled to a volt-
age independent of V
CC
or V
BATT
, up to 5.5V. This
allows the device to monitor and operate from direct
battery voltage while interfacing to higher voltage
microprocessors.
The MAX6439/MAX6440 single-output voltage monitors
provide a single low-battery output,
LBO
. These fixed-
threshold devices assert
LBO
when V
BATT
drops below
V
LTH
and remain asserted for at least 150ms after
V
BATT
rises above V
HTH
(see Figure 2). The MAX6441/
MAX6442 triple-output voltage monitors provide three
low-battery outputs:
LBOH
,
LBOL
, and
LBOLH
.
LBOH
asserts when V
BATT
drops below V
HTH-
and remains
asserted for at least 150ms after V
BATT
rises above
V
HTH+
.
LBOL
asserts when V
BATT
drops below V
LTH-
and remains asserted for at least 150ms after V
BATT
rises above V
LTH+
.
LBOLH
asserts when V
BATT
drops
below V
LTH-
and remains asserted for at least 150ms
after V
BATT
rises above V
HTH+
(see Figure 3). For fast-
rising V
BATT
input, the
LBOL
timeout period must com-
plete before the
LBOH
/
LBOLH
timeout period begins.
Reset Output
The MAX6439
–
MAX6442 provide an active-low reset
output (
RESET
).
RESET
is asserted when the voltage at
V
CC
falls below the reset threshold level. Reset remains
asserted for the reset timeout period after V
CC
exceeds
the threshold. If V
CC
goes below the reset threshold
before the reset timeout period is completed, the inter-
nal timer restarts. The MAX6439/MAX6441 have open-
drain reset outputs, while the MAX6440/MAX6442 have
push-pull reset outputs (see Figure 4).
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated μP Reset
8
_______________________________________________________________________________________
5%
HYST
LTH
DETECT
V
DETECT
5%
HYST
HTH
DETECT
V
BATT
V
CC
1.23V
LBO
TIMEOUT
PERIOD
RESET
TIMEOUT
PERIOD
V
CC
LBOL
LBOH
LBOLH
RESET
MR
MAX6441
Figure 1b. Functional Diagram
MAX6440
LTH
DETECT
HTH
DETECT
R
S
Q
LBO TIMEOUT
PERIOD
RESET
TIMEOUT
PERIOD
V
DETECT
V
CC
V
CC
V
BATT
LBO
RESET
V
CC
1.23V
Q
MR
Figure 1a. Functional Diagram
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