topic LAN8720 power consumption in LPCXpresso IDE https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529726#M1641 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by madid87 on Fri May 17 07:37:33 MST 2013</STRONG><BR /><SPAN>Hello.</SPAN><BR /><SPAN>I'm having trouble with the LAN8720 which is used on lpcxpresso board.</SPAN><BR /><BR /><SPAN>Datasheet states that power consumption should be around 45mA with 100Mbit traffic.</SPAN><BR /><BR /><SPAN>These are my results (ampermeter in series with LAN820 power supply, tested on custom board)</SPAN><BR /><SPAN>After reset, no cable connected - 42mA</SPAN><BR /><SPAN>Power Down - 2.5mA</SPAN><BR /><SPAN>100Mbit operation - 80mA.</SPAN><BR /><BR /><SPAN>It's almost 2x the specified and I noticed that the IC is a little hot.</SPAN><BR /><BR /><SPAN>Is this maybe a mistake in the datasheet and 80mA is normal?</SPAN><BR /><BR /><SPAN>The communication is working properly.</SPAN><BR /><BR /><SPAN>Thank you.</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:15:18 GMT lpcware 2016-06-16T00:15:18Z LAN8720 power consumption https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529726#M1641 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by madid87 on Fri May 17 07:37:33 MST 2013</STRONG><BR /><SPAN>Hello.</SPAN><BR /><SPAN>I'm having trouble with the LAN8720 which is used on lpcxpresso board.</SPAN><BR /><BR /><SPAN>Datasheet states that power consumption should be around 45mA with 100Mbit traffic.</SPAN><BR /><BR /><SPAN>These are my results (ampermeter in series with LAN820 power supply, tested on custom board)</SPAN><BR /><SPAN>After reset, no cable connected - 42mA</SPAN><BR /><SPAN>Power Down - 2.5mA</SPAN><BR /><SPAN>100Mbit operation - 80mA.</SPAN><BR /><BR /><SPAN>It's almost 2x the specified and I noticed that the IC is a little hot.</SPAN><BR /><BR /><SPAN>Is this maybe a mistake in the datasheet and 80mA is normal?</SPAN><BR /><BR /><SPAN>The communication is working properly.</SPAN><BR /><BR /><SPAN>Thank you.</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:15:18 GMT https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529726#M1641 lpcware 2016-06-16T00:15:18Z Re: LAN8720 power consumption https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529727#M1642 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by R2D2 on Fri May 17 18:11:34 MST 2013</STRONG><BR /><HR /><SPAN style="color: #0000ff;"><STRONG>Quote: madid87</STRONG><BR />After reset, no cable connected - 42mA<BR />Power Down - 2.5mA<BR />100Mbit operation - 80mA.<BR /><BR />It's almost 2x the specified and I noticed that the IC is a little hot.</SPAN><HR /><BR /><BR /><SPAN>That's not unusual (and may vary with LED power consumption). At least for my LAN8720 board (with powerful LEDs and a very hot LAN8720).</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:15:19 GMT https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529727#M1642 lpcware 2016-06-16T00:15:19Z Re: LAN8720 power consumption https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529728#M1643 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by madid87 on Sat May 18 00:00:34 MST 2013</STRONG><BR /><HR /><SPAN style="color: #0000ff;"><STRONG>Quote: R2D2</STRONG><BR />That's not unusual (and may vary with LED power consumption). At least for my LAN8720 board (with powerful LEDs and a very hot LAN8720).</SPAN><HR /><BR /><BR /><SPAN>Hi.</SPAN><BR /><SPAN>Thank you for the reply.</SPAN><BR /><BR /><SPAN>The problem is that the current consumption is outside one specified in the datasheets and I must be absolutely sure that the design is correct since I'm working on a commercial product.</SPAN><BR /><BR /><SPAN>Best regards.</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:15:20 GMT https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529728#M1643 lpcware 2016-06-16T00:15:20Z Re: LAN8720 power consumption https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529729#M1644 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by R2D2 on Sat May 18 03:01:49 MST 2013</STRONG><BR /><HR /><SPAN style="color: #0000ff;"><STRONG>Quote: madid87</STRONG><BR />... I must be absolutely sure...</SPAN><HR /><BR /><BR /><SPAN>Then ask SMSC: </SPAN><A href="http://">https://www2.smsc.com/mkt/intforms.nsf/faemail</A></BODY></HTML> Thu, 16 Jun 2016 00:15:20 GMT https://community.nxp.com/t5/LPCXpresso-IDE/LAN8720-power-consumption/m-p/529729#M1644 lpcware 2016-06-16T00:15:20Z