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参数资料
| 型号： | MAX16038 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power Battery Backup Circuits in Small レDFN Packages |
| 中文描述： | 低功耗电池备份电路，采用微型µDFN封装 |
| 文件页数： | 10/21页 |
| 文件大小： | 228K |
| 代理商： | MAX16038 |
M
Low-Power Battery Backup
Circuits in Small μDFN Packages
10
______________________________________________________________________________________
Backup Battery Switchover
To preserve the contents of the RAM in a brownout or
power failure, the MAX16033–MAX16040 automatically
switch to back up the battery installed at BATT when
the following two conditions are met:
1) V
CC
falls below the reset threshold voltage.
2) V
CC
is below V
BATT
.
Table 1 lists the status of the inputs and outputs in bat-
tery-backup mode. The devices do not power-up if the
only voltage source is V
BATT
. OUT only powers up from
V
CC
at startup.
Manual-Reset Input
(MAX16033/MAX16037 Only)
Many μP-based products require manual-reset capabil-
ity, allowing the user or external logic circuitry to initiate
a reset. For the MAX16033/MAX16037, a logic-low on
MR
asserts
RESET
.
RESET
remains asserted while
MR
is low and for a minimum of 140ms (t
RP
) after it returns
high.
MR
has an internal 20k
(min) pullup resistor to
V
CC
. This input can be driven from TTL/CMOS logic
outputs or with open-drain/collector outputs. Connect a
normally-open momentary switch from
MR
to GND to
create a manual-reset function; external debounce cir-
cuitry is not required. When driving
MR
from long
cables or when using the device in a noisy environ-
ment, connect a 0.1μF capacitor from
MR
to GND to
provide additional noise immunity.
Watchdog Input
(MAX16034/MAX16038 Only)
The watchdog monitors μP activity through the watch-
dog input (WDI).
RESET
asserts when the μP fails to
toggle WDI. Connect WDI to a bus line or μP I/O line. A
change of state (high to low, low to high, or a minimum
100ns pulse) resets the watchdog timer. If WDI remains
high or low for longer than the watchdog timeout period
(t
WD
), the internal watchdog timer runs out and triggers
a reset pulse for the reset timeout period (t
RP
). The
internal watchdog timer clears whenever reset is
asserted or whenever WDI sees a rising or falling edge.
If WDI remains in either a high or low state, a reset
pulse periodically asserts after every watchdog timeout
period (t
WD
); see Figure 2.
Table 1. Input and Output Status in
Battery-Backup Mode
PIN
V
CC
OUT
STATUS
Disconnected from OUT
Connected to BATT
BATT
Connected to OUT. Current drawn from the
battery is less than 1μA (at V
BATT
= 2.8V,
excluding I
OUT
) when V
CC
= 0V.
RESET
BATTON
Asserted
High state
MR
, RESETIN,
CE
IN, and WDI
Inputs ignored
CE
OUT
PFO
Connected to OUT
Asserted
t
WD
= WATCHDOG TIMEOUT PERIOD
t
RP
= RESET TIMEOUT PERIOD
WDI
RESET
t
WD
t
WD
t
RP
t
RP
Figure 2. MAX16034/MAX16038 Watchdog Timeout Period and
Reset Active Time
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PDF描述 |
|---|---|
| MAX16039 | Low-Power Battery Backup Circuits in Small レDFN Packages |
| MAX16040 | Low-Power Battery Backup Circuits in Small レDFN Packages |
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| MAX16049 | Hold function, Loop detection; Vin (V) max.: 24; Icc (mA) max.: 6.45; Fmax (kHz) max.: 400; Topr [Tjopr] (°C): -40 to +125; Remarks: Power factor collection; Package: DIP; Pin count: 16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16038LLA23+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX16038LLA23+T | 功能描述:监控电路 Battery Backup 2.5V-Ep RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX16038LLA26+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.63V 8PIN UDFN - Rail/Tube |
| MAX16038LLA26+T | 功能描述:监控电路 Battery Backup 2.63V RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX16038LLA29+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.93V 8PIN UDFN - Rail/Tube |
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