EVAL-ADM1175EBZ Analog Devices Inc, EVAL-ADM1175EBZ Datasheet

BOARD EVALUATION FOR ADM1175

EVAL-ADM1175EBZ

Manufacturer Part Number
EVAL-ADM1175EBZ
Description
BOARD EVALUATION FOR ADM1175
Manufacturer
Analog Devices Inc

Specifications of EVAL-ADM1175EBZ

Main Purpose
Power Management, Hot Swap Controller
Embedded
No
Utilized Ic / Part
ADM1175
Primary Attributes
Hot Swap Controller, Digital Power Monitor, High Side MOSFET Driver
Secondary Attributes
SMBus, I2C, 3.15 V ~ 16.5 V Supply
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
Allows safe board insertion and removal from
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)
I
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 I
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.
Rev. B
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.
2
C fast mode-compliant interface (400 kHz maximum)
a live backplane
2
C® interface.
Digital Power Monitor with Convert Pin
On
Te
Fax:
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
I
from the ADC. Measurements can be initiated by an I
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 I
pin is connected.
The ADM1175 is packaged in a 10-lead MSOP.
2
C interface allows a controller to read current and voltage data
l: 781.329.4700
e Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.
SENSE
3.15V TO 16.5V
781.461.3113
VCC
ON
2
C addresses can be created, depending on how the ADR
UV COMPARATOR
1.3V
ADM1175-1
Hot Swap Controller and
FUNCTIONAL BLOCK DIAGRAM
AMPLIFIER
CURRENT
SENSE
TIMER
ON
A
ADM1175-1
VCC
©2006–2008 Analog Devices, Inc. All rights reserv
GND
Figure 2. Applications Diagram
R
GND
SENSE
SENSE
V
I
CONV
GATE
MUX
ADR
SDA
SCL
0
1
Figure 1.
N-CHANNEL FET
CONTROLLER
FET DRIVE
TIMER
12-BIT
ADC
SDA
SCL
CONV
ADM1175
CONTROLLER
I
P = VI
www.analog.c
2
C
2
C command
SDA
SCL
ADR
GATE
CONV
om
ed.
A.

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EVAL-ADM1175EBZ Summary of contents

Page 1

FEATURES Allows safe board insertion and removal from a live backplane Controls supply voltages from 3. 16.5 V Precision current sense amplifier Precision voltage input 12-bit ADC for current and voltage readback Charge pumped gate drive for external ...

Page 2

ADM1175 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 Thermal Characteristics .............................................................. 5 ESD Caution .................................................................................. 5 Pin ...

Page 3

SPECIFICATIONS −40°C to +85°C; typical values Table 1. Parameter VCC PIN Operating Voltage Range Supply Current Undervoltage Lockout, V UVLO Undervoltage Lockout Hysteresis, ...

Page 4

ADM1175 Parameter 1 MONITORING ACCURACY Current Sense Absolute Accuracy 0°C to +70°C 0°C to +85°C −40°C to +85° for ADC Full Scale SENSE Voltage Sense Accuracy 0°C to +70°C 0°C to +85°C −40°C to +85° for ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter VCC Pin SENSE Pin TIMER Pin ON/ONB Pin CONV Pin GATE Pin SDA Pin, SCL Pin ADR Pin Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) Junction Temperature Stresses above those ...

Page 6

ADM1175 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 VCC Positive Supply Input Pin. The operating supply voltage range is from 3. 16 undervoltage lockout (UVLO) circuit resets the ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 (V) CC Figure 4. Supply Current vs. Supply Voltage ...

Page 8

ADM1175 (V) CC Figure 10. Gate Pull-Down Current vs. Supply Voltage –2 –4 –6 –8 –10 –12 – ...

Page 9

V (V) CC Figure 16.Timer Pull-Up Current (Initial Cycle) vs. Supply Voltage 0 –10 –20 –30 –40 –50 –60 –70 – ...

Page 10

ADM1175 120 115 110 105 100 (V) CC Figure 22. Circuit Breaker Limit Voltage vs. Supply Voltage 110 108 V OCFAST 106 104 102 V LIM 100 98 V ...

Page 11

CODE Figure 28. INL for ADC –1 –2 –3 –4 3500 4000 0 Rev Page 11 of ...

Page 12

ADM1175 OVERVIEW OF THE HOT SWAP FUNCTION When circuit boards are inserted into a live backplane, discharged supply bypass capacitors draw large transient currents from the backplane power bus as they charge. Such transient currents can cause permanent damage to ...

Page 13

GATE AND TIMER FUNCTIONS DURING A HOT SWAP OPERATION During hot insertion of a board onto a live supply rail at VCC, the abrupt application of supply voltage charges the external FET drain/gate capacitance, which can cause an unwanted gate ...

Page 14

ADM1175 When the initial timing cycle terminates, the device is ready to start a hot swap operation (assuming that the ON/ONB pin is asserted). In the example shown in Figure 30, the ON pin is asserted at the same time ...

Page 15

VOLTAGE AND CURRENT READBACK In addition to providing hot swap functionality, the ADM1175 also contains the components to allow voltage and current 2 readback over bus. The voltage output of the current sense amplifier and the voltage ...

Page 16

ADM1175 1 SCL SDA START BY MASTER FRAME 1 SLAVE ADDRESS 1 SCL (CONTINUED) SDA (CONTINUED) 1 SCL SDA START BY MASTER FRAME 1 SLAVE ADDRESS 1 SCL (CONTINUED) ...

Page 17

WRITE AND READ OPERATIONS 2 The I C specification defines several protocols for different types of read and write operations. The operations used in the ADM1175 are discussed in this section. Table 6 shows the abbreviations used in the command ...

Page 18

ADM1175 WRITE EXTENDED COMMAND BYTE In the write extended command byte operation, the master device writes to one of the three extended registers of the slave device, as follows: 1. The master device asserts a start condition on SDA. 2. ...

Page 19

READ VOLTAGE AND/OR CURRENT DATA BYTES Depending on how the device is configured, the ADM1175 can be set up to provide information in three ways: voltage and current readback, voltage only readback, and current only readback. See the Write Command ...

Page 20

ADM1175 Table 15. Status Byte Operations Bit Name Function 0 ADC_OC An ADC-based overcurrent comparison is detected on the last three conversions 1 ADC_ALERT An ADC-based overcurrent trip has occurred, causing the alert. Cleared by writing to Bit 4 of ...

Page 21

APPLICATIONS INFORMATION APPLICATIONS WAVEFORMS CH1 1.5A CH2 1.00V M40.0ms CH3 20.0V CH4 10.0V Figure 41. Inrush Current Control into 220 μF Load (Channel Channel Channel ...

Page 22

ADM1175 KELVIN SENSE RESISTOR CONNECTION When using a low value sense resistor for high current measurement, the problem of parasitic series resistance may arise. The lead resistance can be a substantial fraction of the rated resistance, making the total resistance ...

Page 23

... OUTLINE DIMENSIONS ORDERING GUIDE Model Hot Swap Retry Option 1 ADM1175-1ARMZ-R7 Automatic Retry Version 1 ADM1175-2ARMZ-R7 Latched Off Version 1 ADM1175-3ARMZ-R7 Automatic Retry Version 1 ADM1175-4ARMZ-R7 Latched Off Version EVAL-ADM1175EBZ RoHS Compliant Part. 3.10 3.00 2. 5.15 3.10 4.90 3.00 4.65 2. PIN 1 0.50 BSC 0.95 0.85 1 ...

Page 24

ADM1175 NOTES Purchase of licensed components of Analog Devices, Inc., or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I 2 Patent Rights to use these components ...

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