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7/ Features
7.1. Rapid Shutdown (SW5)
Kontron has implemented a rapid shutdown function. It works as follows:
1.
An active-high shutdown signal is asserted by the COMe Eval Type T7 carrier board through button switch SW5.
The characteristics of the shutdown signal are as follows:
Amplitude 5.0V +/- 5%
Rise time ⇐ 1 µs
Source impedance < = 50 ohms
Duration >= 20 µs
The assertion of this signal causes all power regulators to be disabled and the internal power supply rails to be
discharged by crowbar circuits. The shutdown circuitry provides internal energy storage that maintains crowbar
activation for at least 2 ms following the de-assertion of the shutdown signal.
2.
Simultaneously with the leading edge of shutdown, the 12 V (main) input power to the module is removed and
these input power pins are externally clamped to ground though a crowbar circuit located on the COM Express
carrier board. This external clamping circuit must maintain a maximum resistance of approximately 1 ohm and be
activated for a minimum of 2 ms.
3.
Simultaneously with the leading edge of shutdown, the 5 V (standby) input power to the module is removed, if
present. External clamping on these pins is not necessary (but recommended) because it is clamped through the
module by the main 12 V rail.
www.kontron.com
COMe Eval Carrier T7 (A2T7) User Guide Rev 1.1
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