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LTC2939IMS

更新时间： 2024-11-09 11:41:51
品牌 Logo 应用领域
凌特 - Linear 监视器
页数 文件大小 规格书
20页 251K
描述
Confi gurable 4- and 6-Supply Monitors with Watchdog Timer

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中文翻译

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LTC2939IMS 数据手册

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LTC2938/LTC2939  
Configurable 4- and 6-Supply  
Monitors with Watchdog Timer  
FEATURES  
DESCRIPTION  
The LTC®2938/LTC2939 are configurable supply monitors  
forsystemswithuptofourorsixsupplyvoltagesthatneed  
n
Simultaneously Monitors Four (LTC2938) or Six  
Supplies (LTC2939)  
n
Sixteen User-Selectable Combinations of 5V, 3.3V,  
2.5V, 1.8V, 1.5V, 1.2V and/or Adꢀustable Voltage  
Thresholds  
Guaranteed Threshold Accuracy: 1.5ꢁ  
Adꢀustable Reset and Watchdog Timeout  
Low Supply Current: 80μA Typical  
Power Supply Glitch Immunity  
Guaranteed RST for V > 1V  
High Temperature Operation to 125°C  
12-Pin 4mm × 3mm DFN or 12-Lead MSOP  
(LTC2938) and 16-Lead MSOP Package (LTC2939)  
watchdog supervision. One of sixteen preset or adjustable  
voltage monitor combinations can be selected using an  
external resistive divider connected to the program input.  
The preset voltage thresholds are accurate to 1.5ꢀ over  
temperature. The LTC2938 and LTC2939 also feature ad-  
justable inputs with a 0.5V nominal threshold.  
n
n
n
n
n
n
n
The reset and watchdog timeout periods are adjustable  
usingexternalcapacitors.Tightvoltagethresholdaccuracy  
andglitchimmunityensurereliableresetoperationwithout  
false triggering. The RST output is guaranteed to be in the  
CC  
correct state for V down to 1V. Each status output has  
CC  
a weak internal pull-up and may be externally pulled up  
APPLICATIONS  
to a user-defined voltage.  
n
Desktop and Notebook Computers  
The80μAsupplycurrentmakestheLTC2938andLTC2939  
ideal for power conscious systems. The LTC2939 moni-  
tors up to six supplies and the LTC2938 monitors up to  
four supplies.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 6967591, 7239251, 7119714.  
n
Multivoltage Systems  
n
Telecom Equipment  
Network Servers  
Automotive Control Systems  
n
n
TYPICAL APPLICATION  
6-Supply Monitor 12V (ADJ), 5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ)  
Voltage Configuration Table  
12V  
5V  
3.3V  
V1 (V) V2 (V) V3 (V) V4 (V) V5 (V) V6 (V)  
5
3.3  
3.3  
3.3  
3.3  
3.3  
2.5  
2.5  
1.8  
1.8  
1.8  
2.5  
2.5  
1.8  
1.8  
1.5  
1.2  
2.5  
2.5  
1.8  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
SYSTEM  
2.5V  
5
LOGIC  
1.8V  
1.2V  
5
1.8  
5
5
ADJ  
ADJ  
1.8  
1.8  
1.5  
2150k 124k  
–ADJ  
1ꢀ  
1ꢀ  
3.3  
3.3  
3.3  
3.3  
3.3  
3.3  
3.3  
3.3  
3.3  
3.3  
3.3  
1.5  
ADJ  
1.2  
V1  
V2  
V3  
V4  
V5  
V6  
WDI  
WDO  
RST  
0.1μF  
1.5  
1.2  
ADJ  
ADJ  
ADJ  
–ADJ  
ADJ  
–ADJ  
ADJ  
ADJ  
LTC2939  
CWT  
0.1μF  
V
REF  
100k  
1ꢀ  
100k  
1ꢀ  
R1  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
ADJ  
59k  
1ꢀ  
V
t
t
= 94ms  
= 940ms  
PG  
RST  
WD  
CRT  
GND  
R2  
40.2k  
1ꢀ  
C
WT  
47nF  
C
RT  
47nF  
293839 TA01  
293839ff  
1
1234567...20

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