Kontron COMe Starterkit Eval T2 - Manual (Page 146)

COM Express Interfaces
2.22.10.2. TYPE10# Strap - Reclaimed from VCC_12V
No additional protection is needed for the TYPE10# strap on the Module side:
 On Type 10 Modules, this pin is tied through a 47K resistor to GND. Exposure of this
Module pin to 12V is harmless.
 On Rev. 1 Type 1,2,3,4,5 Modules, this pin is tied to VCC_12V already.
 On Rev. 2 Type 1,2,3,4,5 Modules, this pin is a no connect.
 On Type 6 Modules, this pin is a no connect.
On the Carrier side, protection against accidental 12V exposure is required. Carrier Board
designs shall be tolerant of protracted VCC_12V exposure on the TYPE10# pin. A Rev. 1 Type 1
Module, for example, would expose the TYPE10# pin on a Rev. 2 Type 1,2,3,4,5 Carrier to 12V
(unless the Carrier design does not allow the system to power up for an incorrect Module type).
The TYPE10# Module pin is, in effect, a tri-level pin: it is tied, depending on Module Type and
COM.0 Revision level, to either VCC_12V, to nothing, or to GND through 47K. Carrier Board
circuits can be created that distinguish between the 3 levels. If implemented, this would allow the
Carrier Board to determine whether a Type 1,2,3,4,5 Module is a built to COM.0 Rev. 1 or Rev. 2.
This may be illustrated in a future edition of the PICMG Carrier Design Guide.
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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