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ADM1176-1ARMZ-R7 Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer ADM1176-1ARMZ-R7
Bauteilbeschribung  Hot Swap Controller and I2C짰 Power Monitor with Convert Pin
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADM1176-1ARMZ-R7 Datenblatt(HTML) 1 Page - Analog Devices

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Hot Swap Controller and
I2C® Power Monitor with Convert Pin
ADM1176
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
Allows safe board insertion and removal from a live backplane
Controls supply voltages from 3.15 V to 16.5 V
Precision current sense amplifier
Precision voltage input
12-bit ADC for current and voltage readback
Charge pumped gate drive for external N-channel FET
Adjustable analog current limit with circuit breaker
±3% accurate hot swap current limit level
Fast response limits peak fault current
Automatic retry or latch-off on current fault
Programmable hot swap timing via TIMER pin
Active-high ON pin
I2C® fast mode-compliant interface (400 kHz maximum)
Two address pins allow 16 devices on the same bus
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunication and data communication equipment
PCs/servers
GENERAL DESCRIPTION
The ADM1176 is an integrated hot swap controller 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.
The ADM1176 limits the current through this resistor by control-
ling the gate voltage of an external N-channel FET in the power
path, via the GATE pin. The sense voltage (and, therefore, the
inrush current) is kept below a preset maximum.
The ADM1176 protects the external FET by limiting the time
that it spends with maximum current running through it. This
current limit period is set by the choice of capacitor attached to
the TIMER pin. Additionally, the device provides protection from
overcurrent events that may occur once the hot swap event is
complete. In the case of a short-circuit event, the current in the
sense resistor exceeds an overcurrent trip threshold, and the FET
is switched off immediately by pulling down the GATE pin.
FUNCTIONAL BLOCK DIAGRAM
V
I
0
1
ADM1176
SENSE
ON
VCC
1.3V
MUX
I2C
12-BIT
ADC
FET DRIVE
CONTROLLER
GND
CURRENT
SENSE
AMPLIFIER
UV COMPARATOR
A
SDA
SCL
A1
A0
GATE
TIMER
Figure 1.
RSENSE
N-CHANNEL FET
P = VI
CONTROLLER
ADM1176
SENSE
VCC
SDA
SCL
SDA
SCL
GND
GATE
A0
A1
TIMER
3.15V TO 16.5V
ON
Figure 2. Applications Diagram
A 12-bit ADC can measure the current seen in the sense
resistor, as well as 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 16 unique I2C addresses can be
created, depending on the way the A0 and A1 pins are connected.
The ADM1176 is packaged in a 10-lead MSOP.


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