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Digital Power Monitor
with Clear Pin and ALERT Output
Data Sheet
FEATURES
ADM1192
FUNCTIONAL BLOCK DIAGRAM
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
VCC
SENSE
ADM1192
A
V
I
0
1
12-BIT
ADC
I 2 C
SDA
SCL
Programmable overcurrent filtering via TIMER pin
CLRB input pin
CURRENT
SENSE
AMPLIFIER
MUX
ADR
I 2 C fast mode-compliant interface (400 kHz maximum)
10-lead MSOP
APPLICATIONS
SETV
COMPARATOR
ALERT
ALERT
Power monitoring/power budgeting
Central office equipment
GND
Figure 1.
CLRB
TIMER
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 I 2 C? interface.
VCC SENSE
ALERT
ADM1192
SETV SDA
SCL
CONTROLLER
INTERRUPT
P = VI
SDA
SCL
An internal current sense amplifier measures voltage across the
sense resistor in the power path via the VCC pin and the SENSE pin.
TIMER
GND
CLRB
ADR
CLRB
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
I 2 C interface allows a controller to read current and voltage
data from the ADC. Measurements can be initiated by an I 2 C
command. Alternatively, the ADC can run continuously, and
the user can read the latest conversion data whenever it is
required. Up to four unique I 2 C 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 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.
Rev. D Document Feedback
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 registered trademarks are the property of their respective owners.
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 during which a higher than nominal
inrush current may be flowing.
The ADM1192 is packaged in a 10-lead MSOP.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ?2006–2013 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
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