Linear Technology DC1680A Demo Manual Download Page 3

Page: 3 / 28

dc1840afb

DEMO MANUAL DC1840A

Quick start proceDure

Figure 3. DC1680A Basic Setup

Figure 4. System Setup with the DC590, DC1680A, DC1682A and 55V Power Supply

Summary of Contents for DC1680A

Page 1: ...is connected to the DC1680A for I2C interfacing with QuikEval This demonstration manual provides a Quick Start Procedure a DC1682A overview a DC1680A L LT LTC LTM Linear Technology and the Linear logo...

Page 2: ...1 to disable midspan mode 3 Alignpin1ofthe34 pinmaleconnectorontheDC1682A with pin 1 of the 34 pin female connector on the DC1680A Figure2 Pin12ispolarizedtoassistwiththe alignment Carefully push the...

Page 3: ...3 dc1840afb DEMO MANUAL DC1840A quick start procedure Figure 3 DC1680A Basic Setup Figure 4 System Setup with the DC590 DC1680A DC1682A and 55V Power Supply...

Page 4: ...power management features in the LTC4270 LTC4271 chipset include per port 12 bit current monitor ing ADCs DAC programmable current limit and versatile quick shutdown of preselected ports PD discovery...

Page 5: ...across an isolation barrier through a data transformer Figure 6 This eliminates the need for expensive opto couplers All digital pins reside on the digital ground refer ence and are isolated from the...

Page 6: ...s of theLTC4270 LTC4271chipsetgeneralpurposeinputoutput pins These pins are configured as inputs or outputs via I2C GP1 and GP0 are referenced to DGND and driven by the LTC4271 when set as outputs Fig...

Page 7: ...Port Protection Ethernet ports can be subject to significant ESD events when long data cables each potentially charged to thou sands of volts are plugged into the low impedance of the RJ45 jack To pr...

Page 8: ...ports at the 2 6 RJ45 connector J4 on the DC1680A Figure 3 J4 has an integrated Ethernet transformer and common mode termination for each port Test points for port outputs OUT1 through OUT12 are provi...

Page 9: ...nheldinactivewithallportsoffandallinternalregisters reset to their power up states When SW1 is released RESETispulledhigh andthePSEbeginsnormaloperation PushbuttonswitchSW2whenpressedpullsthemaskable...

Page 10: ...wer LED Indicators Each PSE port has a green LED indicator to show when PoE power is present at the port The LEDs are driven by the respective port OUT voltage DC1680A System Setup Figure 14 shows a b...

Page 11: ...11 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Operation Figure 14 DC1680A and DC1682A System Setup with Power Supply DC590 and PD Demo Board...

Page 12: ...12 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1682A Layout Top Silkscreen Layer 1 Top Layer Layer 2 VEE Plane 1...

Page 13: ...13 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1682A Layout Layer 3 VEE Plane 2 Layer 4 Bottom Layer Bottom Silkscreen...

Page 14: ...14 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Top Silkscreen...

Page 15: ...15 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Layer 1 Top Layer...

Page 16: ...16 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Layer 2 AGND CGND Plane 1...

Page 17: ...17 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Layer 3 SIG AGND CGND Plane 2...

Page 18: ...18 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Layer 4 SIG AGND CGND Plane 3...

Page 19: ...19 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Layer 5 SIG CGND CGND Plane 4...

Page 20: ...20 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Layer 6 Bottom Layer...

Page 21: ...21 dc1840afb DEMO MANUAL DC1840A Demonstration Circuit 1680A Layout Bottom Silkscreen...

Page 22: ...0 J2 OPT 2 5 0 079 DOUBLE ROW HEADER 13 12 Q1 TO Q12 N CH 100V 7 5A Power 33 FAIRCHILD FDMC3612 14 1 Q13 NPN TRANSISTOR BC846AS SOT 363 DIODES BC846AS 7 15 48 RL1 RK1 RJ1 RI1 RH1 RG1 RF1 RE1 RD1 RC1...

Page 23: ...SE 0154010 16 17 E1 TO E17 TESTPOINT TURRET 0 061 PBF MILL MAX 2308 2 00 80 00 00 07 0 17 1 J1 CONNECTOR 2mm BOX SOCKET 34 PIN SAMTEC MMS 134 02 T SV 18 0 J2 OPT HEADER POWER 19 1 J3 CONNECTOR SS 7310...

Page 24: ...5 AAC CR10 102JM 37 0 R22 R23 OPT RES 0805 38 2 SW1 SW2 SWITCH PUSH BOTTOM W RTH 434123050816 39 1 SW3 SWITCH 219 3MST CTS ELECTRIC COMPONENTS 219 3MST 40 10 E18 TO E27 TESTPOINT TURRET 0 094 PBF MILL...

Page 25: ...IO1 D4 GRN XIO1 1 2 R9 0 R9 0 C24 2 2nF C24 2 2nF R28 560 R28 560 T1 WURTH 7490100143 T1 WURTH 7490100143 TD 1 CT 2 TD 3 N C 4 N C 5 RD 6 CT 3 7 RD 8 RX 9 CT 4 10 RX 11 N C 12 N C 13 TX 14 CT 2 15 TX...

Page 26: ...ION HISTORY DESCRIPTION DATE APPROVED ECO REV DILIAN R PRODUCTION 3 2 24 11 REVISION HISTORY DESCRIPTION DATE APPROVED ECO REV DILIAN R PRODUCTION 3 2 24 11 REVISION HISTORY DESCRIPTION DATE APPROVED...

Page 27: ...S1B D17 S1B D14 S1B D14 S1B D9 S1B D9 S1B D10 S1B D10 S1B VC1 J4 14 VC1 J4 14 1 11 133 2 11 134 3 11 135 4 11 136 5 11 137 6 11 138 7 11 139 8 11 140 9 11 141 11 11 143 12 11 144 10 11 142 SHIELD J4 1...

Page 28: ...NCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR...