Janz Tec emPC-CX+, Справочное руководство системы

Страница: 26 / 44

3 - 24 emPC-CX+ ( System Reference Manual)

System Control
©
Janz Tec AG Rev. 1.2
3 System Control
The emPC-CX+ provides some features for system control and supervision. Refer to figure 3 for the
relevant components:

The system MCU which controls the power supply and COM express module run state.
Controlled either by the power supply voltage or by the control input (mid pin on the power
supply connector).

The system MCU provides an I2C slave interface on the host I2C to monitor and modify
system operation.

Access to the host I2C bus is possible by a I2C master interface which is either provided by
the FPGA subsystem (standard emPC-CX+) or by the COM express I2C interface (emPC-
CX+ Lite).

A digital temperature sensor is available and can be read via the system MCU.

The ispPAC power sequencer which controls and monitors the internal power supplies. The
integrated ADC can check any of the internal voltages and might be read via the system MCU.

A fan controller which controls and monitors fan speed based on its internal temperature
sensor or temperatures that are supplied over the host I2C bus via the system MCU.
System
MCU
Main Power
Supply
(DCDC converter)
M
C
U
I
C
2
Fan controller
Thermal
Sensor
+12V
PWM
RPM
Filter
(PWM)
DS75
Temp sensor
Host I C
2
P
C
Ie
ispPAC
(power sequencer)
FPGA
COMe
Figure 3: emPC-CX+ system supervision