EVAL-ADM1068LQEBZ Analog Devices Inc, EVAL-ADM1068LQEBZ Datasheet
EVAL-ADM1068LQEBZ
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EVAL-ADM1068LQEBZ Summary of contents
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FEATURES Complete supervisory and sequencing solution for supplies 8 supply fault detectors enable supervision of supplies to <0.5% accuracy at all voltages at 25°C <1.0% accuracy across all voltages and temperatures 4 selectable input attenuators allow supervision ...
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ADM1068 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Detailed Block Diagram .................................................................. 3 Specifications ..................................................................................... 4 Absolute Maximum Ratings ............................................................ 6 Thermal Resistance ...................................................................... 6 ...
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DETAILED BLOCK DIAGRAM VX1 VX2 VX3 VX4 SELECTABLE VP1 ATTENUATOR VP2 VP3 SELECTABLE VH ATTENUATOR AGND VDDCAP ARBITRATOR REFOUT REFGND SDA SCL A1 VREF INTERFACE ADM1068 CONTROLLER GPI SIGNAL CONDITIONING SFD GPI SIGNAL CONDITIONING SEQUENCING ENGINE SFD SFD SFD REG ...
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ADM1068 SPECIFICATIONS 3 14 VPx = 3 6.0 V Table 1. Parameter POWER SUPPLY ARBITRATION VH, VPx VPx VH VDDCAP C VDDCAP POWER SUPPLY Supply Current VPx ...
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Parameter Standard (Digital Output) Mode (PDO1 to PDO8 SINK R PULL- (VPx) SOURCE Three-State Output Leakage Current Oscillator Frequency DIGITAL INPUTS (VXx, A0, A1) Input High Voltage ...
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ADM1068 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Voltage on VH Pin Voltage on VPx Pins Voltage on VXx Pins Voltage on A0, A1 Pins Voltage on REFOUT Pin Voltage on VDDCAP, VCCP Pins Voltage on PDOx Pins Voltage on SDA, ...
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 11 Connection VX1 to VX4 High Impedance Inputs to Supply Fault Detectors. Fault thresholds can be set from ...
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ADM1068 TYPICAL PERFORMANCE CHARACTERISTICS (V) VP1 Figure 4. V vs. V VDDCAP (V) VH Figure ...
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I (µA) LOAD Figure 10. Charge-Pumped V (FET Drive Mode) vs. I PDO1 5.0 4.5 4.0 3.5 3.0 2.5 VP1 = 3V 2.0 1.5 1.0 0.5 0 ...
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ADM1068 POWERING THE ADM1068 The ADM1068 is powered from the highest voltage input on either the positive-only supply inputs (VPx) or the high voltage supply input (VH). This technique offers improved redundancy because the device is not dependent on any ...
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INPUTS SUPPLY SUPERVISION The ADM1068 has eight programmable inputs. Four of these are dedicated supply fault detectors (SFDs). These dedicated inputs are called VH and VPx (VP1 to VP3) by default. The other four inputs are labeled VXx (VX1 to ...
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ADM1068 The hysteresis value is given × N /255 HYST R THRESH where the desired hysteresis voltage. HYST N is the decimal value of the 5-bit hysteresis code. THRESH Note that N has a ...
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OUTPUTS SUPPLY SEQUENCING THROUGH CONFIGURABLE OUTPUT DRIVERS Supply sequencing is achieved with the ADM1068 using the programmable driver outputs (PDOs) on the device as control signals for supplies. The output drivers can be used as logic enables or as FET ...
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ADM1068 SEQUENCING ENGINE OVERVIEW The ADM1068 sequencing engine (SE) provides the user with powerful and flexible control of sequencing. The SE implements a state machine control of the PDO outputs with state changes conditional on input events. SE programs can ...
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SEQUENCING ENGINE APPLICATION EXAMPLE The application in this section demonstrates the operation of the SE. Figure 21 shows how the simple building block of a single SE state can be used to build a power-up sequence for a three- supply ...
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ADM1068 Monitoring Fault Detector The monitoring fault detector block is used to detect a failure on an input. The logical function implementing this is a wide OR gate that can detect when an input deviates from its expected condition. The ...
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APPLICATIONS DIAGRAM 12V OUT 3V OUT 3.3V OUT 1.25V OUT 1.2V OUT 0.9V OUT RESET 10µF VH ADM1068 PDO1 VP1 PDO2 VP2 VP3 PDO3 PDO4 VX1 PDO5 VX2 VX3 PWRGD PDO6 SIGNAL VALID PDO7 ...
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ADM1068 COMMUNICATING WITH THE ADM1068 CONFIGURATION DOWNLOAD AT POWER-UP The configuration of the ADM1068 (undervoltage/overvoltage thresholds, glitch filter timeouts, PDO configurations, and so on) is dictated by the contents of the RAM. The RAM comprises digital latches that are local ...
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POWER-UP (V > 2.5V) CC EEPROM UPDATING THE SEQUENCING ENGINE Sequencing engine (SE) functions are not updated in the same way as regular configuration latches. The SE has its own dedicated 512-byte EEPROM for storing state definitions, providing 63 individual ...
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ADM1068 The device also has several identification registers (read-only) that can be read across the SMBus. Table 10 lists these registers with their values and functions. Table 10. Identification Register Values and Functions Name Address Value Function MANID 0xF4 0x41 ...
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SCL SDA START BY MASTER FRAME 1 SLAVE ADDRESS 1 SCL (CONTINUED) SDA D7 D6 (CONTINUED) t SCL HD; STA SDA t BUF P S SMBus PROTOCOLS FOR RAM AND EEPROM The ADM1068 ...
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ADM1068 The master sends a command code telling the slave device to erase the page. The ADM1068 command code for a page erasure is 0xFE (1111 1110). Note that for a page erasure to take place, the page address must ...
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An address crosses a page boundary. In this case, both pages must be erased before programming. Note that the ADM1068 features a clock extend function for writes to the EEPROM. Programming an EEPROM byte takes approximately 250 μs, which ...
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... ADM1068AST-REEL7 −40°C to +85°C 1 ADM1068ASTZ −40°C to +85°C 1 ADM1068ASTZ-REEL7 −40°C to +85°C 1 EVAL-ADM1068LQEBZ RoHS Compliant Part. ©2005–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 0.75 1.60 MAX 0.60 ...