General Purpose Input/Output; I 2 C Bus; Power Loss Control; Fan Control - Congatec COM Express conga-TC175 User Manual

6.2.3

General Purpose Input/Output

The conga-TC175 offers general purpose inputs and outputs for custom system design. These GPIOs are multiplexed with SD signals and are
controlled by the cBC.
6.2.4 I C Bus
2
The conga-TC175 supports I
6.2.5

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".
6.2.6

Fan Control

The conga-TC175 has additional signals and functions to further improve system management. One of these signals is an output signal called
FAN_PWMOUT 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.
6.3

OEM BIOS Customization

The conga-TC175 is equipped with congatec Embedded BIOS, which is based on American Megatrends Inc. Aptio UEFI firmware. The
congatec Embedded BIOS allows system designers to modify the BIOS. For more information about customizing the congatec Embedded
BIOS, refer to the congatec System Utility user's guide CGUTLm1x.pdf on the congatec website at www.congatec.com or contact technical
support.
The customization features supported are described below:
Copyright © 2017 congatec AG
2 C bus. Thanks to the I 2 C host controller in the cBC, the I 2 C bus is multi-master capable and runs at fast mode.
TCKLm10 33/71