User's Manual l MBa8x UM 0100 l © 2021, TQ-Systems GmbH
Page 20
The following TQMa8x signals are used on the MBa8x:
Table 9:
Reset and Power Mode signals
Signal
Type Level
Remark
RESET_IN#
I
1.8 V
•
Triggers RESET (POR_B) of the i.MX 8 (low active)
•
No pull-up on the carrier board required
•
Low active (pull to GND, push button S7)
RESET_OUT#
O
–
•
Open Drain output (low active)
•
Resets carrier board components
•
Pull-up on carrier board required (up to 6.5 V)
IMX_ONOFF
I
1.8 V
•
ON/OFF function of the i.MX 8 (low active)
•
No pull-up on the carrier board required
•
Connect 5 s with GND (push button S9) to switch off the CPU
•
Low-active (pull to GND)
PMIC_PWRON
I
1.8 V
•
Switches PMIC off (Off-Mode, low active)
•
No pull-up on the carrier board required
•
Low-active (pull to GND, push button S8)
Figure 4: Placement push buttons on MBa8X
3.7
General purpose push buttons
For simple user inputs, the MBa8x offers two short-travel keys that are directly connected to the CPU. The signal lines have a 10
kΩ pull-up to V_1V8 and can be switched to ground by the push buttons.
TQMa8x
User-
Buttons
GPIO
2x
Figure 5:
Block diagram GP push buttons
