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ADM1192 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADM1192
Description  Digital Power Monitor with Clear Pin and ALERT Output
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM1192 Datasheet(HTML) 1 Page - Analog Devices

 
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Digital Power Monitor
with Clear Pin and ALERT Output
ADM1192
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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 Analog Devices, Inc. All rights reserved.
FEATURES
Powered from 3.15 V to 26 V
Precision current sense amplifier
Precision voltage input
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
I2C® fast mode-compliant interface (400 kHz maximum)
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunication and data communication equipment
PCs/servers
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.
An internal current sense amplifier senses voltage across the sense
resistor in the power path via the VCC pin and the SENSE pin.
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.
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.
FUNCTIONAL BLOCK DIAGRAM
V
I
0
1
ADM1192
SENSE
SETV
VCC
MUX
I2C
ALERT
CLRB
CURRENT
SENSE
AMPLIFIER
A
SDA
SCL
ADR
ALERT
GND
TIMER
COMPARATOR
12-BIT
ADC
Figure 1.
RSENSE
P = VI
CONTROLLER
ADM1192
SENSE
VCC
SDA
SCL
SDA
SCL
GND
ALERT
CLRB
CLRB
ADR
TIMER
3.15V TO 26V
SETV
ALERT
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 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.


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