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ADM1192

更新时间: 2024-11-07 04:31:19
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亚德诺 - ADI 监控
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20页 389K
描述
Digital Power Monitor with Clear Pin and ALERT Output

ADM1192 数据手册

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Digital Power Monitor  
with Clear Pin and ALERT Output  
ADM1192  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Powered from 3.15 V to 26 V  
Precision current sense amplifier  
Precision voltage input  
ADM1192  
SDA  
V
VCC  
0
12-bit ADC for current and voltage readback  
2
12-BIT  
ADC  
SCL  
ADR  
I C  
ALERT output allows basic P-channel FET hot swap  
up to 26 V  
SETV input for setting overcurrent alert threshold  
Programmable overcurrent filtering via TIMER pin  
CLRB input pin  
I2C® fast mode-compliant interface (400 kHz maximum)  
10-lead MSOP  
I
1
A
SENSE  
MUX  
CURRENT  
SENSE  
AMPLIFIER  
ALERT  
ALERT  
SETV  
COMPARATOR  
APPLICATIONS  
Power monitoring/power budgeting  
Central office equipment  
GND  
CLRB  
TIMER  
Figure 1.  
Telecommunication and data communication equipment  
PCs/servers  
3.15V TO 26V  
R
SENSE  
GENERAL DESCRIPTION  
VCC  
SENSE  
ALERT  
The ADM1192 is an integrated current sense amplifier that  
offers digital current and voltage monitoring via an on-chip,  
12-bit analog-to-digital converter (ADC), communicated  
through an I2C interface.  
CONTROLLER  
ALERT  
ADM1192  
P = VI  
SDA  
SDA  
SCL  
SETV  
SCL  
CLRB  
CLRB  
An internal current sense amplifier senses voltage across the sense  
resistor in the power path via the VCC pin and the SENSE pin.  
TIMER  
ADR  
GND  
A 12-bit ADC can measure the current seen in the sense resistor  
and in the supply voltage on the VCC pin. An industry-standard  
I2C interface allows a controller to read current and voltage  
data from the ADC. Measurements can be initiated by an I2C  
command. Alternatively, the ADC can run continuously, and  
the user can read the latest conversion data whenever it is  
required. Up to four unique I2C addresses can be created,  
depending on the way the ADR pin is connected.  
Figure 2. Applications Diagram  
The ALERT output can be used as a flag to warn a micro-  
controller or field programmable gate array (FPGA) of an  
overcurrent condition. ALERT outputs of multiple ADM1192  
devices can be tied together and used as a combined alert.  
A SETV pin is also included. A voltage applied to this pin is  
internally compared to the output voltage on the current sense  
amplifier. The output of the SETV comparator asserts when the  
current sense amplifier output exceeds the SETV voltage. This  
event is detected at the ALERT block. The ALERT block then  
charges up the external TIMER capacitor with a fixed current.  
When this timing cycle is complete, the ALERT output asserts.  
A basic P-channel FET hot swap circuit can be implemented  
with the ALERT output. The value of the TIMER capacitor  
should be set so that the charging time of this capacitor is much  
longer than the period where a higher than nominal inrush  
current may be flowing.  
The ADM1192 is packaged in a 10-lead MSOP.  
Rev. 0  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 

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