FW: Mpc5200 and ISP1106/1107 USB transceivers

FW: Mpc5200 and ISP1106/1107 USB transceivers

[Dieter Schneider]

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Mit freundlichen Grüßen
Berghof Automationstechnik GmbH

i.A. Dieter Schneider
- Entwicklungsingenieur -
http://www.berghof.com
mailto:dieter.schneider@berghof.com
Phone: +49 7121 894-129
Fax:   +49 7121 894-100
Adresse:
Harretstr.1  72800 Eningen
Deutschland


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From: "Dieter Schneider" <dieter.schneider@berghof.com>
To: <Martin.Krause@tqs.de>
Subject: Mpc5200 and ISP1106/1107 USB transceivers
Date: Thu, 4 Aug 2005 17:14:44 +0200

Hello Mr.Krause,

i made an investigation with Philips 1106/1107 USB transceivers not working
with low speed devices and mpc5200:
-usb 1.1 specification gives a rise/fall time for low speed devices in range
75ns to 300ns.
-"working" devices like Philips PDIUSBP11 have a rise/fall time of aprox.
120ns
-isp1106 / 1107 are in range of 180ns, that's inside usb 1.1 spec, but not
working with mpc5200

So its a problem of mpc5200, not philips 1106/1107 transceivers, who are
inside usb 1.1 spec. Setting transceiver speed pin konstant to High(=high
speed device) let the isp1106/1107 work also with low speed devices, but of
course with high speed rise/fall times (7..20ns). By the way, Phillips
PDIUSBP11 is obsolet. Giving the USB D+/D- an additional capacitive load
(for example 120pF, thats inside usb 1.1 spec ) makes an working Phillips
PDIUSBP11 not working.

Mit freundlichen Grüßen
Berghof Automationstechnik GmbH

i.A. Dieter Schneider
- Entwicklungsingenieur -
http://www.berghof.com
mailto:dieter.schneider@berghof.com
Phone: +49 7121 894-129
Fax:   +49 7121 894-100
Adresse:
Harretstr.1  72800 Eningen
Deutschland