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ADM1178
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 Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Overview of the Hot Swap Function ............................................ 12
Undervoltage Lockout ............................................................... 12
ON Function ............................................................................... 12
TIMER Function ........................................................................ 12
GATE and TIMER Functions During a Hot Swap Operation
....................................................................................................... 13
Calculating Current Limits and Fault Current Limit Time .. 13
REVISION HISTORY
6/12—Rev. C to Rev. D
Changes to Low Level Input Voltage, V IL Parameter, Test
Conditions/Comments Column, Table 1 and High Level Input
Voltage, V IH Parameter, Test Conditions/Comments Column,
Table 1 ................................................................................................ 3
Changes to ALERTB Output Section and Kelvin Sense Resistor
Connection Section ........................................................................ 22
Deleted Figure 50; Renumbered Sequentially............................. 23
Updated Outline Dimensions ....................................................... 23
5/09—Rev. B to Rev. C
Changes to Figure 1 .......................................................................... 1
2/08—Rev. A to Rev. B
Changed V VCC to V CC Throughout ................................................. 3
Changes to Input Current for 11 Decode, I ADRHIGH , Parameter... 3
Changes to Input Current for 00 Decode, I ADRLOW , Parameter ... 3
Added ADC Conversion Time Parameter .................................... 5
Added Fast Overcurrent Response Time Parameter ................... 5
Added Endnote 2 and Endnote 3 ................................................... 5
Changes to Figure 14 ........................................................................ 9
Changes to Figure 15 Caption......................................................... 9
Changes to Figure 24 ...................................................................... 11
Changes to TIMER Function Section .......................................... 13
Changes to General I 2 C Timing Section, Step 3 ......................... 16
Data Sheet
Initial Timing Cycle ................................................................... 13
Hot Swap Retry Cycle on the ADM1178-1 ............................. 14
Voltage and Current Readback ..................................................... 15
Serial Bus Interface..................................................................... 15
Identifying the ADM1178 on the I 2 C Bus............................... 15
General I 2 C Timing .................................................................... 15
Write and Read Operations ........................................................... 17
Quick Command ........................................................................ 17
Write Command Byte ................................................................ 17
Write Extended Command Byte .............................................. 18
Read Voltage and/or Current Data Bytes ................................ 19
Applications Information .............................................................. 21
Applications Waveforms............................................................ 21
ALERTB Output ......................................................................... 22
Kelvin Sense Resistor Connection ........................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
Changes to Table 5.......................................................................... 16
Changes to Quick Command Section ......................................... 18
Changes to Figure 38...................................................................... 18
Changes to Table 7.......................................................................... 18
Changes to Write Extended Command Byte Section ................ 19
Changes to Figure 40...................................................................... 19
Changes to Table 9 and Table 11 .................................................. 19
Changes to Converting ADC Codes to Voltage and
Current Readings Section.............................................................. 20
4/07—Rev. 0 to Rev. A
Changes to Table 1.............................................................................3
Changes to GATE and TIMER Functions During
a Hot Swap Section ......................................................................... 14
Changes to Calculating Current Limits and
Fault Current Limit Time Section ................................................ 14
Changes to Initial Timing Cycle Section ..................................... 15
Changes to Table 5.......................................................................... 16
Changes to Figure 35 and Figure 36 ............................................ 17
Changes to Figure 40...................................................................... 19
Changes to Figure 42 and Figure 43 ............................................ 20
Added Applications Information Heading ................................. 22
9/06—Revision 0: Initial Version
Rev. D | Page 2 of 24
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