HTC Hermes USB connector pin config

From: http://www.tracyandmatt.co.uk/blogs/index.php/2006/09/10/htc_hermes_usb_connector_pin_config

Enhanced Mini USB (EMU) connectors are double sided. One side carry's the USB signal data while the other carries audio signals. The pin config is as follows.

Data
A = GND
B = NC
C = +DATA
D = -DATA
E = +5v

Pin B is used to recognize original charger when connected to ground (pin A)
One thing you might want to mention though is that "pin B" in the usb spec has N/C (ignoring usb2go) the hermes seems to use it to detect charging source.

Current theory is that it works like this:
If power is detected and a usb connection is negotiated on the data lines, charge.
If power is detected and a usb connection is not detected, don't charge . (Theres a bug where it will accept some charge at least the first time only you connect power, then you have to reset).
If power is detected and usb connection is not detected BUT pin's A and B are bridged then allow 'dumb' charging.

Audio
1 = +Mic
2 = +Right
3 = Switch
4 = Gnd
5 = Gnd
6 = +Left

You can find Enhanced Mini USB connectors on a variety of devices. The above config covers the USB configuration of the Orange SPV M3100, HTC TyTN , Vodafone v1605, HTC Oxygen devices and HTC Meteor devices and probably many more.

Use at your own risk though, play safe!

Matt

[Technorati tag(s): smartphone, Pocket PC, spv headphone socket, m3100 spv usb cable, M3100, HTC Hermes, HTC TyTN , SPV, Orange SPV M3100, Hermes Headphones]

Comments:
You cannot connect any USB 'slave' device to the M3100, the M3100 simply doesn't have the necessary hardware to achieve this. All PDA's have this limitation at the moment, the one exception will be the XDA Flame. When that is released it will have'USB on the Go' which is a new technology that will enable external devices to be connected.

If I plug the USB cable into a HTC device, then plug that usb cable into a usb port and just wire that up to a bench power supply... the device draws a few hundred milliamps. (As much as USB spec allows).
This device, much like other mobile devices I have used which USB charge, can barely draw enough power of the USB to run itself let alone charge the battery.

However, if you close the A/B pins you are telling the phone "This is not a USB port, its a 1A power brick" so the phone charges the battery at its maximum safe rate.