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Analog Devices - Hot Swap Controller and Digital Power Monitor

Numéro de référence ADM1175
Description Hot Swap Controller and Digital Power Monitor
Fabricant Analog Devices 
Logo Analog Devices 





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ADM1175 fiche technique
Data Sheet
Hot Swap Controller and
Digital Power Monitor with Convert Pin
ADM1175
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 and active low ON/ONB pin options
Convert start pin (CONV)
I2C fast mode-compliant interface (400 kHz maximum)
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunications and data communications equipment
PCs/servers
GENERAL DESCRIPTION
The ADM1175 is an integrated hot swap controller and 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 measures voltage across
the sense resistor in the power path via the VCC pin and the
SENSE pin.
The ADM1175 limits the current through this resistor by
controlling the gate voltage (via the GATE pin) of an external
N-channel FET in the power path. The voltage across the sense
resistor (and, therefore, the inrush current) is kept below a
preset maximum.
The ADM1175 protects the external FET by limiting the time
that the maximum current runs through it. This current limit
period is set by the value of the 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
ADM1175-1
MUX
CONV
VCC
V
0
SENSE
I
A1
12-BIT
SDA
ADC
I2C SCL
ADR
CURRENT
SENSE
AMPLIFIER
ON
1.3V
UV COMPARATOR
GND
FET DRIVE
CONTROLLER
TIMER
Figure 1.
GATE
3.15V TO 16.5V
RSENSE N-CHANNEL FET
VCC SENSE
GATE
ADM1175-1
ON SDA
SCL
CONV
TIMER
GND ADR
CONTROLLER
P = VI
SDA
SCL
CONV
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
or via the convert (CONV) pin. The CONV pin is especially
useful for synchronizing reads on multiple ADM1175 devices.
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 how the ADR
pin is connected.
The ADM1175 is packaged in a 10-lead MSOP.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
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 ©2006–2012 Analog Devices, Inc. All rights reserved.

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