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ADM1192_08

更新时间: 2024-11-30 04:31:19
品牌 Logo 应用领域
亚德诺 - ADI 监控
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20页 419K
描述
Digital Power Monitor with Clear Pin and ALERT Output

ADM1192_08 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  
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  
2
12-BIT  
ADC  
SCL  
ADR  
I C  
I
1
A
SENSE  
MUX  
CURRENT  
SENSE  
AMPLIFIER  
I2C fast mode-compliant interface (400 kHz maximum)  
10-lead MSOP  
ALERT  
ALERT  
SETV  
COMPARATOR  
APPLICATIONS  
GND  
CLRB  
TIMER  
Power monitoring/power budgeting  
Central office equipment  
Figure 1.  
Telecommunications and data communications equipment  
PCs/servers  
3.15V TO 26V  
R
SENSE  
GENERAL DESCRIPTION  
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.  
VCC  
SENSE  
ALERT  
CONTROLLER  
INTERRUPT  
P = VI  
ADM1192  
SDA  
SDA  
SCL  
SETV  
SCL  
An internal current sense amplifier measures voltage across the  
sense resistor in the power path via the VCC pin and the SENSE pin.  
CLRB  
CLRB  
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 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. 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 during which a higher than nominal  
inrush current may be flowing.  
The ADM1192 is packaged in a 10-lead MSOP.  
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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