Evaluation Board User Guide UG-288 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Quad Voltage Monitor and Sequencer Evaluation Kit FEATURES GENERAL DESCRIPTION Evaluation kit for the ADM1185 quad voltage monitor and sequencer 6 LEDs indicate power supply status, providing a clear visual indication of the power-up sequence Dedicated power and enable/disable switches On-board test points allow examination of the ADM1185’s operation The EVAL-ADM1185EBZ evaluation kit demonstrates how the ADM1185 can provide quad voltage monitoring and sequencing in multiple supply systems. The ADM1185 monitors four separate voltage rails, turns on three regulators in a predefined sequence, and generates a power-good signal when all supplies are operating and stable. LEDs provide a visual indication of the status of the main supply voltage, each of the four inputs, and the system powergood signal (PWRGD). EVALUATION KIT CONTENTS ADM1185 main evaluation board ADM1185 data sheet EVAL-ADM1185EBZ evaluation kit data sheet 2 ADM1185 samples Four on-board rotary switches allow the user to investigate the result of altering each of the monitored input voltages. The user can simulate fault conditions during power-up and while the ADM1185 is in the power-good state. FUNCTIONAL BLOCK DIAGRAM J1 S2 VCC J3 IN REG0 EN 3.3V IN ADM1185 VIN1 OUT1 IN REG1 EN OUT 2.5V OUT 2.5V OUT OUT IN VIN2 OUT2 REG2 EN 1.8V OUT 1.5V OUT IN VIN3 OUT3 VIN4 PWRGD GND Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. 1.8V OUT OUT Rev. 0 | Page 1 of 12 REG3 EN 1.5V OUT OUT PWRGD 09907-001 S1 UG-288 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Setting Voltage-Detection Levels ................................................5 Evaluation Kit Contents ................................................................... 1 Theory of Operation .....................................................................5 General Description ......................................................................... 1 Simulating a Power-Up Sequence ...............................................5 Functional Block Diagram .............................................................. 1 Observing Fault Conditions During Power-On........................5 Revision History ............................................................................... 2 Observing Fault Conditions Following Power-On ...................6 Evaluation Board Hardware ............................................................ 3 Additional Delays ..........................................................................6 Connector, Switch, Jumper, LED, and Test Point Functions .. 3 Evaluation Board Schematics...........................................................7 Evaluation Board Operation ........................................................... 5 Ordering Information .......................................................................9 ADM1185 Samples ....................................................................... 5 Bill of Materials ..............................................................................9 Powering the Evaluation Board .................................................. 5 REVISION HISTORY 6/11—Revision 0: Initial Version Rev. 0 | Page 2 of 12 Evaluation Board User Guide UG-288 EVALUATION BOARD HARDWARE CONNECTOR, SWITCH, JUMPER, LED, AND TEST POINT FUNCTIONS Table 1. Connector Functions Pin J1 Name Power connector J3 Terminal block J9 J10 6W_MINIMOLEX 6W_MINIMOLEX Function J1-1: connects the positive terminal of the bench power supply to the board J1-2: connects the ground terminal of the bench power supply to the board J3-1: connects a 9 V power supply to the evaluation board J3-2: connects a 9 V power supply to ground Connects to the next board when interconnecting ADM1185 evaluation boards Connects to the previous board when interconnecting ADM1185 evaluation boards Table 2. Switch Functions Switch S1 Description Switch for powering on and off the board S2 Switch for choosing which power supply to connect to the evaluation board Sets the time delay associated with the 3.3 V input S3 S4 Sets the time delay associated with the 2.5 V input S5 Sets the time delay associated with the 1.8 V input S6 Sets the time delay associated with the 1.5 V input VR1 VR2 VR3 VR4 Rotary switch Rotary switch Rotary switch Rotary switch Position Switched to 5 V supply Switched to ground Switched to J1 Switched to J3 Function Connects the 5 V rail to the enable input of Regulator 0 Grounds the enable input of Regulator 0 Connects a 9 V power supply to the evaluation board Connects the bench power supply to the evaluation board S3-1 connected to S3-8 S3-2 connected to S3-7 S3-3 connected to S3-6 S3-4 connected to S3-5 S4-1 connected to S4-8 S4-2 connected to S4-7 S4-3 connected to S4-6 S4-4 connected to S4-5 S5-1 connected to S5-8 S5-2 connected to S5-7 S5-3 connected to S5-6 S5-4 connected to S5-5 S6-1 connected to S6-8 S6-2 connected to S6-7 S6-3 connected to S6-6 S6-4 connected to S6-5 N/A N/A N/A N/A Connects C2 (10 nF) between the VIN1 pin and ground Connects C7 (0.1 µF) between the VIN1 pin and ground Connects C8 (1 µF) between the VIN1 pin and ground Connects C5 and C9 (user defined) between the VIN1 pin and ground Connects C12 (10 nF) between the VIN2 pin and ground Connects C15 (0.1 µF) between the VIN2 pin and ground Connects C17 (1 µF) between the VIN2 pin and ground Connects C14 and C21 (user defined) between the VIN2 pin and ground Connects C23 (10 nF) between the VIN3 pin and ground Connects C25 (0.1 µF) between the VIN3 pin and ground Connects C27 (1 µF) between the VIN3 pin and ground Connects C24 and C35 (user defined) between the VIN3 pin and ground Connects C28 (10 nF) between the VIN4 pin and ground Connects C29 (0.1 µF) between the VIN4 pin and ground Connects C30 (1 µF) between the VIN4 pin and ground Connects C31 and C36 (user defined) between the VIN4 pin and ground Reduces the 3.3 V supply level when the switch is turned clockwise Reduces the 2.5 V supply level when the switch is turned clockwise Reduces the 1.8 V supply level when the switch is turned clockwise Reduces the 1.5 V supply level when the switch is turned clockwise Rev. 0 | Page 3 of 12 UG-288 Evaluation Board User Guide Table 3. Jumper Functions Jumper J2 J4 J5 J6 J7 J8 J11 J12 Description Connects J1-1 to J3-1 J4-A: connects the VCC pin to 3.3 V J4-B: connects the VCC pin to 5 V J4-C: connects the VCC pin to VCC_P J4-D: connects the VCC pin to VCC_N Connects VR2 to the feedback pin of Regulator U1 Connects VR3 to the feedback pin of Regulator U2 Connects VR4 to the feedback pin of Regulator U3 Connects VR1 to the feedback pin of Regulator U23 J11-A: connects the VIN1 pin to OUT3_P J11-B: connects the VIN1 pin to PWRGD_P J11-C: connects the VIN1 pin to VCC J12-A: connects the PWRGD pin to the PWRGD LED circuitry J12-B: connects the PWRGD pin to PWRGD_P and is useful when interconnecting evaluation boards Table 4. LED Functions LED D1 D2 D3 D4 D5 D6 Name 3.3 V 2.5 V 1.8 V 1.5 V PWRGD VCC Function Yellow LED indicates the status of the 3.3 V supply voltage. Yellow LED indicates the status of the 2.5 V supply voltage. Yellow LED indicates the status of the 1.8 V supply voltage. Yellow LED indicates the status of the 1.5 V supply voltage. Green LED indicates when the PWRGD output is asserted. Red LED indicates that the board is powered on. Table 5. Test Points Test Point VCC VIN1 VIN2 VIN3 VIN4 GND OUT1 OUT2 OUT3 PWRGD REG1FB REG1IN REG1SD REG2FB REG2IN REG2SD REG3FB REG3IN REG3SD REG4FB REG4IN REG4SD Function Monitors the voltage at the positive supply input pin Monitors the voltage at Pin VIN1 Monitors the voltage at Pin VIN2 Monitors the voltage at Pin VIN3 Monitors the voltage at Pin VIN4 Monitors the chip ground pin Monitors the voltage at Pin OUT1 Monitors the voltage at Pin OUT2 Monitors the voltage at Pin OUT3 Monitors the voltage at the PWRGD output Monitors the feedback pin of Regulator U23 Monitors the input pin of Regulator U23 Monitors the shutdown control pin of Regulator U23 Monitors the feedback pin of Regulator U1 Monitors the input pin of Regulator U1 Monitors the shutdown control pin of Regulator U1 Monitors the feedback pin of Regulator U2 Monitors the input pin of Regulator U2 Monitors the shutdown control pin of Regulator U2 Monitors the feedback pin of Regulator U3 Monitors the input pin of Regulator U3 Monitors the shutdown control pin of Regulator U3 Rev. 0 | Page 4 of 12 Default Input Input Output Output Output Input Input Input Input Output Output Output Input Output Evaluation Board User Guide UG-288 EVALUATION BOARD OPERATION the voltage on pin, VIN1, reaches 0.6 V, OUT1 asserts after a 190 ms delay. When this occurs, the open-drain output switches high, and the external pull-up resistor pulls the voltage on the regulator enable pin above its turn-on threshold, turning on the output of the regulator. ADM1185 SAMPLES Two loose ADM1185 samples have been included in the evaluation kit. Place a single sample in the socket before powering on the evaluation board. POWERING THE EVALUATION BOARD There are two methods of powering the EVAL-ADM1185EBZ, either by connecting a 9 V power supply through J3 or by connecting a bench supply through J1 (the 9 V and ground leads must be connected separately). When using a 9 V power supply, make sure to switch S2 to the 9 V position; alternatively, when using a bench supply, switch S2 to the VCC position. SETTING VOLTAGE-DETECTION LEVELS Each of the ADM1185’s input pins, VIN1 to VIN4, monitors one of four supply voltages. The VIN1 pin monitors the 3.3 V rail. An external resistor divider scales this voltage down for monitoring at the VIN1 pin. The resistor ratio has been chosen so that the VIN1 voltage is 0.6 V when the main voltage rises to the preferred level at startup. For example, if R1 is 130 k Ω and R2 is 33 kΩ, a voltage level of 2.97 V corresponds to 0.6 V at the VIN1 pin, as shown in Figure 2. 3.3V V 130kΩ 3.3V 2.97V ADM1185 t 2.97V SUPPLY GIVES 0.6V AT VIN1 PIN 33kΩ 09907-002 VIN Figure 2. Use of an External Resistor Divider to Scale the Input Voltage to the Appropriate Level Similar external resistor divider networks are also implemented on VIN2 to VIN4. THEORY OF OPERATION OUT1 is an open-drain, active high output and is connected to the enable pin of Regulator U1. Before the voltage on VIN1 reaches 0.6 V, OUT1 is switched to ground, disabling the regulator. When The 2.5 V output of this regulator begins to rise. This is detected by Input VIN2. When VIN2 sees the 2.5 V rail rise above its threshold point, it asserts OUT2, turning on Regulator U2. The same scheme is, in turn, implemented on the other input and output pins. After the final supply, 1.5 V, turns on, the outputs (OUT1 to OUT3) are logically AND’ed together to generate a system power-good signal (PWRGD). There is an internal 190 ms delay associated with the assertion of the PWRGD output. SIMULATING A POWER-UP SEQUENCE Each of the monitored inputs is adjustable using one of the four rotary switches, VR1 to VR4. By turning each rotary switch clockwise, the associated input voltage is reduced. LEDs provide a visual indication of the status of each of the four inputs and the system PWRGD signal. Before switching on the power supply, only the red LED, D6, lights up, indicating that a power supply is connected to the board. Begin with all four rotary switches turned fully anticlockwise. Switch the power supply on using Switch S1. Because all four rotary switches are in the anticlockwise position, all four yellow input LEDs, D1 to D4, light up. After a delay of 190 ms, the green PWRG signal LED, D5, also lights up to indicate that the ADM1185 is in the power-good state. OBSERVING FAULT CONDITIONS DURING POWER-ON During power-up, the LEDs provide the user with a clear visual indication of each of the four supplies. If one or more of the supply voltages are below their associated threshold voltages, the power-good state is not asserted, and the green PWRGD LED is not turned on. Rev. 0 | Page 5 of 12 UG-288 Evaluation Board User Guide If all four supply voltages are above their associated threshold, PWRGD asserts and the logical core latches into a different mode of operation. If the 3.3 V supply monitored by VIN1 faults while the device is in the power-good state, the PWRDG output is deasserted and all of the outputs are immediately turned off. If a supply monitored by VIN2 to VIN4 fails, the PWRGD output is deasserted, but the other outputs are not deasserted. Fault conditions can be investigated by using the four rotary switches, VR1 to VR4. By turning a rotary switch clockwise, the associated input voltage is reduced. Rotary Switch VR1 controls the voltage at Input VIN1. As VR1 is turned clockwise, this voltage is reduced. When the voltage at Input Pin VIN1 drops below 0.6 V, OUT1 is switched to ground, disabling Regulator U1. In addition, VIN2 can no longer detect the 2.5 V supply and, in turn, OUT2 and OUT3 are deasserted. As a result, the PWRGD output is also deasserted. The LEDs clearly indicate the status of the four voltage supplies and PWRGD. Similarly, if PWRGD has been asserted and one of the rotary switches, VR2 to VR4, is turned clockwise, reducing the voltage at the associated input pin to below 0.6 V, the PWRGD output is deasserted, but the other outputs are not deasserted. The LEDs provide a clear indication of the status of each of the inputs and PWRGD. ADDITIONAL DELAYS It is possible to introduce additional delays by connecting a capacitor to the input pins, VIN1 to VIN4. For example if a capacitor is placed on the VIN2 pin, the rise of the voltage on that pin slows, effectively setting a time delay between the 2.5 V rail powering up and the next regulator becoming enabled. The S3, S4, S5, and S6 switches conveniently allow the user to introduce time delays to each of the four inputs. Rev. 0 | Page 6 of 12 2.5V ADM1185 130kΩ VIN 46.4kΩ 1µF 09907-003 OBSERVING FAULT CONDITIONS FOLLOWING POWER-ON Figure 3. Introduction of Additional Delay Evaluation Board User Guide UG-288 EVALUATION BOARD SCHEMATICS 09907-004 Figure 4. ADM1185 Evaluation Board Schematic, Page 1 Rev. 0 | Page 7 of 12 Evaluation Board User Guide 09907-005 UG-288 Figure 5. ADM1185 Evaluation Board Schematic, Page 2 Rev. 0 | Page 8 of 12 Evaluation Board User Guide UG-288 ORDERING INFORMATION BILL OF MATERIALS Table 6. Qty 13 Part Type Capacitor Value 1 µF Part Decal 603 Part No. FEC 9402080 4 3 4 Reference Designator C1, C3, C6, C8, C10, C13, C16, C17, C18, C19, C22, C27, C30 C2, C12, C23, C28 C4, C11, C26 C5, C14, C24, C31 Capacitor Capacitor Capacitor 603 402 805 FEC 753622 FEC 3019366 Not Inserted 5 4 C7, C15, C25, C29, C34 C9, C21, C35, C36 Capacitor Capacitor 603 CAP\MR04 FEC 9402047 Insert low profile sockets 1 1 1 4 1 1 1 1 1 18 Capacitor Capacitor+ Capacitor+ Resistor, dual footprint Resistor, dual footprint Resistor, dual footprint Resistor, dual footprint Resistor, dual footprint Resistor Resistor 402 RTAJ_B RTAJ_B 0805_thru-hole 0805_thru-hole 0805_thru-hole 0805_thru-hole 0805_thru-hole 805 805 FEC 3019366 FEC 9753893 FEC 197-014 FEC 1140363 FEC 1108904 FEC 1160246 FEC 1141007 FEC 1140352 FEC 9333185 FEC 9332383 1 1 1 1 1 2 1 1 1 1 2 1 2 1 4 1 1 1 1 4 1 2 1 1 C20 C32 C33 R1, R3, R5, R7 R2 R4 R6 R8 R9 R10, R11, R12, R14, R19, R23, R26, R33 to R35, R40 to R42, R44 to R48 R13 R15 R16 R17 R18 R20, R24 R21 R22 R27 R28 R29, R43 R30 R32, R36 R49 D1, D2, D3, D4 D5 D6 S1 S2 S3, S4, S5, S6 J1 J2, J12 J3 J4 10 nF 470 pF User defined 0.1 µF User defined 1 µF 10 µF 10 µF 130 kΩ 33 kΩ 46.4 kΩ 76.8 kΩ 105 kΩ 390 kΩ 1 kΩ 805 805 805 805 805 1210 805 805 805 805 805 805 805 805 LED-0805 LED-0805 LED-0805 SW-SPDT-SLIDE SW-SPDT-SLIDE DIP8_SMD CON\power SIP-2P CON\barrel Jumper_4_ABCD 4 2 J5, J6, J7, J8 J9, J10 Jumper 6W_MINIMOLEX FEC 9332782 FEC 9333444 FEC 9333177 FEC 9332839 FEC 9333436 N/A FEC 9333657 FEC 9332715 FEC 9332405 FEC 1141007 FEC 1160268 FEC 9333282 FEC 9332464 FEC 9333541 FEC 1021303 FEC 5790852 FEC1058373 FEC 1123875 FEC 1123876 FEC 9901868 FEC 151785 FEC 1022247 and 150411 FEC 224959 FEC 102-2244 (36-pin strip) and 150-411 FEC 1022247 and 150411 FEC 1125368 Resistor Resistor Resistor Resistor Resistor Resistor 1210 Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor LED yellow LED green LED red SW-SPDT-SLIDE SW-SPDT-SLIDE SW\4DIP CON\power Jumper CON-barrel Jumper-4 Rev. 0 | Page 9 of 12 200 kΩ 620 kΩ 39 kΩ 220 kΩ 62 kΩ N/A 910 kΩ 1.8 kΩ 100 kΩ 76.8 kΩ 140 kΩ 470 kΩ 110 kΩ 75 kΩ SIP-2P MOLEX53398-0690 UG-288 Evaluation Board User Guide Qty 1 Reference Designator J11 Part Type Jumper-3 Value 8 4 1 1 1 Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 U1, U2, U3, U23 U4 U5 U6 BC850B ADP3334ARMZ ADM1185ARMZ MC78L05ACZ ADM1185 socket SOT23 MSO8 MSO10 TO-92 MSO10-SKT 4 4 29 VR1, VR2, VR3, VR4 GND, GND1, GND2, GND3 OUT1, OUT2, OUT3, PWRGD, VCC, VIN1, VIN2, VIN3, VIN4, REG1FB, REG1IN, REG1SD, REG2FB, REG2IN, REG2SD, REG3FB, REG3IN, REG3SD, REG4FB, REG4IN, REG4SD, 1_1, 1_2, 1_3, 1_4, 1_5, 1_8, 2_5, 3_3 VRES_rotary Test point Test point VRES_rotary Test point Test point Rev. 0 | Page 10 of 12 Part Decal Jumper_3 Part No. FEC 102-2244 (36-pin strip) and 150-411 FEC 1081239 ADP3334ARMZ ADM1185ARMZ FEC 9489444 Abrel Products 6560102211 FEC 9608290 FEC 8731128 FEC 8731144 Evaluation Board User Guide UG-288 NOTES Rev. 0 | Page 11 of 12 UG-288 Evaluation Board User Guide NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. 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Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG09907-0-6/11(0) Rev. 0 | Page 12 of 12