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ADM1191-2ARMZ-R7

更新时间： 2024-11-30 04:31:19
品牌 Logo 应用领域
亚德诺 - ADI 电源电路电源管理电路监视器光电二极管
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16页 403K
描述
Digital Power Monitor with Convert Pin and ALERTB Output

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ADM1191-2ARMZ-R7 数据手册

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Digital Power Monitor  
with Convert Pin and ALERTB Output  
ADM1191  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Powered from 3.15 V to 26 V  
Precision current sense amplifier  
CONV  
ADM1191  
Precision voltage input  
SDA  
V
VCC  
0
12-bit ADC for current and voltage readback  
Convert (CONV) pin for commanding an ADC read  
SETV input for setting overcurrent alert threshold  
ALERTB output provides an overcurrent interrupt  
I2C fast mode-compliant interface (400 kHz maximum)  
2 address pins allow 16 devices on the same bus  
10-lead MSOP  
SCL  
A1  
2
I C  
12-BIT  
ADC  
I
1
A
SENSE  
MUX  
A0  
CURRENT  
SENSE  
AMPLIFIER  
ALERT  
ALERTB  
SETV  
APPLICATIONS  
COMPARATOR  
Power monitoring/power budgeting  
Central office equipment  
GND  
Figure 1.  
Telecommunications and data communications equipment  
PCs/servers  
3.15V TO 26V  
R
SENSE  
GENERAL DESCRIPTION  
The ADM1191 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.  
VCC  
SENSE  
ALERTB  
CONTROLLER  
INTERRUPT  
P = VI  
ADM1191  
SDA  
SDA  
SCL  
SETV  
An internal current sense amplifier measures voltage across the  
sense resistor in the power path via the VCC pin and the SENSE pin.  
SCL  
CONV  
CONV  
A 12-bit ADC can measure the current seen in the sense  
resistor, as well as the supply voltage on the VCC pin.  
A1  
A0  
GND  
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 or via the convert (CONV) pin.  
The CONV pin is especially useful for synchronizing reads on  
multiple ADM1191 devices. Alternatively, the ADC can run  
continuously, and the user can read the latest conversion data  
whenever it is required. Up to 16 unique I2C addresses can be  
created, depending on the way the A0 pin and the A1 pin are  
connected.  
Figure 2. Applications Diagram  
The ALERTB output can be used as a flag to warn a micro-  
controller or field programmable gate array (FPGA) of an  
overcurrent condition. ALERTB outputs of multiple ADM1191  
devices can be tied together and used as a combined alert.  
The ADM1191 is packaged in a 10-lead MSOP.  
A SETV pin is also included. A voltage applied to this pin is  
internally compared with 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. When this event occurs, the ALERTB output asserts.  
Rev. B  
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  
www.analog.com  
Fax: 781.461.3113 ©2006–2008 Analog Devices, Inc. All rights reserved.  
 
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