ADM1176 Monitor Datasheet

ADM1176 Datasheet PDF, Equivalent


Part Number

ADM1176

Description

Hot Swap Controller and I2C Power Monitor

Manufacture

Analog Devices

Total Page 25 Pages
PDF Download
Download ADM1176 Datasheet PDF


ADM1176
Data Sheet
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)
2 address pins allow 16 devices on the same bus
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunications and data communications 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 measures 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 (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 ADM1176 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 after 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.
Hot Swap Controller and
I2C Power Monitor
ADM1176
FUNCTIONAL BLOCK DIAGRAM
ADM1176
MUX
VCC
V
0
SENSE
I
A1
CURRENT
SENSE
AMPLIFIER
12-BIT
SDA
ADC
I2C SCL
A1
A0
ON
1.3V
UNDERVOLTAGE
COMPARATOR
GND
FET DRIVE
CONTROLLER
TIMER
Figure 1.
GATE
3.15V TO 16.5V
RSENSE N-CHANNEL FET
VCC SENSE
GATE
ADM1176
ON SDA
SCL
CONTROLLER
P = VI
SDA
SCL
TIMER
GND
A1
A0
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 how the A0 and A1 pins are connected.
The ADM1176 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.
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Tel: 781.329.4700
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Fax: 781.461.3113 ©2006–2012 Analog Devices, Inc. All rights reserved.

ADM1176
ADM1176* Product Page Quick Links
Last Content Update: 11/01/2016
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Evaluation Kits
• ADM1176 Evaluation Board
Documentation
Data Sheet
• ADM1176: Hot Swap Controller and I2C Power Monitor
Datasheet
Evaluation Kit Manuals
• UG-659: ADM1175/ADM1176/ADM1177/ADM1178
Evaluation Kit User Guide
User Guides
• UG-404: USB-SDP-CABLEZ Serial Interface Board
Software and Systems Requirements
• ADM1175-78 & ADM1191-92 Evaluation Software
• ADMxxxx Common Run-Time
Reference Materials
Solutions Bulletins & Brochures
• Hot Swap And Power Monitoring Bulletin
Design Resources
• ADM1176 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
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Features Data Sheet FEATURES Allows safe board in sertion and removal from a live backpla ne Controls supply voltages from 3.15 V to 16.5 V Precision current sense ampl ifier Precision voltage input 12-bit AD C for current and voltage readback Char ge-pumped gate drive for external N-cha nnel FET Adjustable analog current limi t with circuit breaker ±3% accurate ho t swap current limit level Fast respons e limits peak fault current Automatic r etry or latch-off on current fault Prog rammable hot swap timing via TIMER pin Active high ON pin I2C fast mode-compli ant interface (400 kHz maximum) 2 addre ss pins allow 16 devices on the same bu s 10-lead MSOP APPLICATIONS Power monit oring/power budgeting Central office eq uipment Telecommunications and data com munications equipment PCs/servers GENER AL DESCRIPTION The ADM1176 is an integr ated hot swap controller that offers di gital current and voltage monitoring vi a an on-chip 12-bit analog-to-digital c onverter (ADC), communicated through an I2C® interface. An int.
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