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7.1.5
Power Loss Control
The cBC has full control of the power-up of the module and therefore can be used to specify the behavior of the system after an AC power loss
condition. Supported modes are “Always On”, “Remain Off” and “Last State”.
AC power loss condition occurs when the module loses the standby voltage on the 5V_SB pins. On congatec modules, the standby voltage is
continuously monitored after the system is turned off. If within 30 seconds the standby voltage is no longer detected, the module considers this
an AC power loss condition. If the standby voltage remains stable for 30 seconds, then it is assumed that the system was switched off properly.
Unlike other module designs available in the embedded market, a CMOS battery is not required by congatec modules to support the ‘Power
Loss Control’ feature.
7.1.6
Fan Control
The conga-TS370 has additional signals and functions to further improve system management. One of these signals is FAN_PWMOUT, an output
signal that allows system fan control using a PWM (Pulse Width Modulation) output. Additionally, there is an input signal called FAN_TACHOIN
that provides the ability to monitor the system’s fan RPMs (revolutions per minute). This signal must receive two pulses per revolution in order
to produce an accurate reading. For this reason, a two pulse per revolution fan or similar hardware solution is recommended.
Note
1. A four wire fan must be used to generate the correct speed readout.
2. For the correct fan control (FAN_PWMOUT, FAN_TACHIN) implementation, see the COM Express Design Guide.
7.1.7
Enhanced Soft-Off State
The conga-TS370 supports an enhanced Soft-Off state (S5e)—a congatec proprietary low-power Soft-Off state. In this state, the CPU module
switches off almost all the onboard logic in order to reduce the power consumption to absolute minimum (usually 1 mA or lower).
Refer to congatec application note AN36_Enhanced_Soft_Off.pdf for detailed description of the S5e state.
