ADM1087 Simple Sequencer™ Evaluation Kit EVAL-ADM1087EB FEATURES GENERAL DESCRIPTION Sequencing of 3.3 V, 2.5 V, and 1.8 V power supplies Red, yellow, and green LEDs indicate power supply status, giving visual demonstration of power-up sequence Dedicated power and enable/disable switches On-board test points allow examination of ADM1087 and regulator I/O signals Sockets allow external through-hole capacitors to be connected manually for customizable time delays The EVAL-ADM1087EB Evaluation Kit demonstrates how the ADM1087 Simple Sequencer™ can be used to provide timebased sequencing in multiple-supply systems. A pair of ADM1087s are cascaded with three ADP3334 LDO regulators, which supply voltage levels of 3.3 V, 2.5 V, and 1.8 V. In this configuration, the 3.3 V supply switches on as soon as power from a 9 V battery is applied, and the 2.5 V and 1.8 V regulators are enabled by delayed detection signals from the outputs of the previous regulators in the circuit. EVALUATION KIT CONTENTS Red, yellow, and green LEDs provide a visual indication of the status of each of the three supplies, and two pairs of wire wrap pins allow for experimentation with different capacitor values for different enable time delays. A dedicated enable/disable switch connects directly to the ENIN ADM1087 inputs to demonstrate how a supply can be switched off by driving this pin low with an external logic signal. ADM1087 evaluation board 9 V battery 2 100 nF ceramic capacitors 4 samples (1 presoldered to on-board adapter) EVALUATION BOARD BLOCK DIAGRAM ON/OFF IN SD 9V ADP3334 IN RED OUT SD 3.3V GREEN OUT ADP3334 1.8V 3.3V VCC ADM1087 SD 2.5V 3.3V VIN IN YELLOW OUT ADP3334 VCC VIN ENOUT ADM1087 ENOUT ENIN CEXT ENIN CEXT 05074-001 9V ENABLE/ DISABLE Figure 1. Rev. 0 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. EVAL-ADM1087EB TABLE OF CONTENTS Power-Up/Power-Down Waveforms.............................................. 3 Ordering Information.......................................................................6 EVAL-ADM1087EB Schematic ...................................................... 4 EVAL-ADM1087EB Bill of Materials.........................................6 Evaluation Board Layout Graphics ................................................ 5 Ordering Guide .............................................................................7 REVISION HISTORY 9/04—Revision 0: Initial Version Rev. 0 | Page 2 of 8 EVAL-ADM1087EB POWER-UP/POWER-DOWN WAVEFORMS The relationship between the size of the external capacitance and the duration of the enable time delay is given by the following formula: 1 2 3 4 05074-003 Figure 2 shows the LDO output sequence when battery power is applied and removed. Channel 1 is the 9 V power signal, which is switched on and off via the S1 switch. Channels 2, 3, and 4 are the 3.3 V, 2.5 V, and 1.8 V ADP3334 LDO outputs, respectively. When the 9 V supply is switched on, the 3.3 V, 2.5 V, and 1.8 V supplies power up in sequence, with 4.7 nF external capacitors used to give delays of 22.5 ms between the enabling of the respective LDOs. CH1 5.00V CH3 5.00V tEN = (C × 4.8 × 106) + 35 µs CH2 5.00V CH4 5.00V M25.0ms Figure 2. Sequenced Waveforms Rev. Pr0 | Page 3 of 8 CH1 5.7V Figure 3. Rev. 0 | Page 4 of 8 9V 05074-002 C1 1µF 9V S1 7 8 S2 ADP3334 IN U1 1 OUT 2 IN OUT 3 6 SD FB 4 5 GND NC P1 C9 1µF R13 51kΩ R12 160kΩ R1 75kΩ R2 150kΩ T5 T1 1 2 3 C2 1µF U4 B E C VCC ENIN CEXT GND ENOUT VIN ADM1087 R16 10kΩ D1 HERED 5 4 6 Q1 R3 3.9kΩ 100nF C7 T4 C3 1µF IN ADP3334 U2 1 OUT 2 7 IN OUT 3 6 SD FB 4 5 GND NC 8 R4 10kΩ R15 51kΩ R14 110kΩ R5 91kΩ R6 10kΩ 2.5V 1 2 3 E C VCC ENIN CEXT 5 4 6 Q2 GND ENOUT VIN ADM1087 U5 B D2 YELLOW R17 10kΩ C4 1µF T6 T2 R7 3.9kΩ 100nF C8 T7 C5 1µF IN 1 2 3 1 2 3 U6 VCC U8 VCC CEXT ENIN CEXT GND ENOUT VIN ENIN 5 4 6 5 4 6 R9 150kΩ R10 75kΩ GND ENOUT VIN ADP3334 U3 1 OUT 2 7 IN OUT 3 6 SD FB 4 5 GND NC 8 R8 10kΩ 1.8V T3 1 2 3 1 2 3 C6 1µF B U7 Q3 VCC E C U9 VCC CEXT ENIN CEXT GND ENOUT VIN ENIN GND ENOUT VIN R18 10kΩ D3 GREEN 5 4 6 5 4 6 R11 3.9kΩ EVAL-ADM1087EB EVAL-ADM1087EB SCHEMATIC EVAL-ADM1087EB 05074-004 05074-006 EVALUATION BOARD LAYOUT GRAPHICS Figure 6. Solder-Side Silkscreen 05074-005 Figure 4. Evaluation Board Layout Figure 5. Component-Side Silkscreen Rev. 0 | Page 5 of 8 EVAL-ADM1087EB ORDERING INFORMATION EVAL-ADM1087EB BILL OF MATERIALS Table 1. Name C1 C2 C3 C4 C5 C6 C7 C8 C9 D1 D2 D3 P1 Q1 Q2 Q3 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 Part Type CAP CAP CAP CAP CAP CAP Wire Wrap Pins Wire Wrap Pins CAP LED LED LED BATT_PP3 BC850B BC850B BC850B RES RES RES RES RES RES RES RES RES RES RES RES RES RES RES Value 1 µF 1 µF 1 µF 1 µF 1 µF 1 µF R16 R17 R18 S1 S2 T1 T2 T3 T4 T5 T6 T7 U1 U2 U3 U4 RES RES RES SW-SPDT-SLIDE SW-SPDT-SLIDE TESTPOINT TESTPOINT TESTPOINT TESTPOINT TESTPOINT TESTPOINT TESTPOINT ADP3334 ADP3334 ADP3334 ADM1087 10 kΩ 10 kΩ 10 kΩ 1 µF 75 kΩ 150 kΩ 3.9 kΩ 10 kΩ 91 kΩ 110 kΩ 3.9 kΩ 10kΩ 150 kΩ 75 kΩ 3.9 kΩ 160 kΩ 51 kΩ 110 kΩ 51 kΩ PCB Decal 0805 0805 0805 0805 0805 0805 CAP\MR04 CAP\MR04 0805 LED_SMT LED_SMT LED_SMT BATT_PP3 SOT23 SOT23 SOT23 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 Part Description 16 V Y5V Ceramic Capacitor 16 V Y5V Ceramic Capacitor 16 V Y5V Ceramic Capacitor 16 V Y5V Ceramic Capacitor 16 V Y5V Ceramic Capacitor 16 V Y5V Ceramic Capacitor Wire Wrap Pins × 2 Wire Wrap Pins × 2 16 V Y5V Ceramic Capacitor HE Red LED Yellow LED Green LED Pair Battery Connectors npn BJT npn BJT npn BJT 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor 0805 0805 0805 SW-SPDT-SLIDE SW-SPDT-SLIDE TESTPOINT TESTPOINT TESTPOINT TESTPOINT TESTPOINT TESTPOINT TESTPOINT MSO8 MSO8 MSO8 SC70-6 0.1 W Resistor 0.1 W Resistor 0.1 W Resistor SPDT Slide Switch SPDT Slide Switch Testpoint Testpoint Testpoint Testpoint Testpoint Testpoint Testpoint LDO Regulator LDO Regulator LDO Regulator Simple Sequencer Rev. 0 | Page 6 of 8 Source Farnell Farnell Farnell Farnell Farnell Farnell Part Number FEC 318-8899 FEC 318-8899 FEC 318-8899 FEC 318-8899 FEC 318-8899 FEC 318-8899 Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell FEC 318-8899 FEC 515-607 FEC 515-619 FEC 515-620 FEC 723-988 FEC 305-0506 FEC 305-0506 FEC 305-0506 FEC 321-8284 FEC 912-116 FEC 911-926 FEC 911-975 FEC 32108296 FEC 321-8302 FEC 911-926 FEC 911-975 FEC 912-116 FEC 321-8284 FEC 911-926 FEC 321-8326 FEC 321-8260 FEC 321-8302 FEC 321-8260 Farnell Farnell Farnell FEC 911-975 FEC 911-975 FEC 911-975 FEC 733-647 FEC 733-647 FEC 200-207 FEC 200-207 FEC 200-207 FEC 200-207 FEC 200-207 FEC 200-207 FEC 200-207 ADP3334ARM ADP3334ARM ADP3334ARM ADM1087AKS Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Analog Devices Analog Devices Analog Devices Analog Devices EVAL-ADM1087EB Name U5 U6 U7 U8 U9 Part Type ADM1087 ADM1085-TEMP ADM1086-TEMP ADM1087-TEMP ADM1088-TEMP Feet Value PCB Decal SC70-6 SC70-6 SC70-6 SC70-6 SC70-6 Part Description Simple Sequencer Simple Sequencer Simple Sequencer Simple Sequencer Simple Sequencer Rubber Stick-On Feet Source Analog Devices Analog Devices Analog Devices Analog Devices Analog Devices 3M ORDERING GUIDE Model EVAL-ADM1087EB Package Description Evaluation Board for ADM1087 Simple Sequencer ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. 0 | Page 7 of 8 Part Number ADM1087AKS ADM1085AKS ADM1086AKS ADM1087AKS ADM1088AKS FEC 148-922 EVAL-ADM1087EB NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05074–0–9/04(0) Rev. 0 | Page 8 of 8