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OT: ISP1581

OT: ISP1581

2005-07-28 by rhpascaldodo

Hi Philips_Apps/Robert,

yes this is very off topic, but I don't see any chance to get some 
infos.
We build a prototype board with the USB2 chip isp1581. All works well,
without any problems. Now we build a small series of boards and got
the problem that the ISP powers up with > 100mA (osc running) while 
the proto board starts with suspend mode < 1mA. 

Obviously there is no difference in the connections of the ISP. 
Because it is a portable device with very low current consumption it 
should only consume this high power when connected to the PC. Of 
course we can immediately put the chip into suspend mode but this 
power peak makes a heavy drop in our power supply.

Question:
What causes the ISP to stay in suspend mode after a reset/poweron or
what is the reason that the chip now always starts with full power? We
can't find any infos in the datasheet and appnotes.

We will be very pleased to get more info or a contact to an
application specialist of Philips.

thank you
Rolf

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