User's Manual l MBa8Xx UM 0100 l © 2020, TQ-Systems GmbH
Page 42
3.9
User interfaces
3.9.1
Reset button
Reset button S4 resets the CPU and PMIC on the TQMa8Xx. The generated reset signal simultaneously activates the RESET_OUT#
signal, which also resets various components on the MBa8Xx.
3.9.2
Power button
Button S5 is directly connected to pin PMIC_PWRON of the TQMa8Xx. By pressing the button the PMIC is switched off (Off-Mode;
low-active).
3.9.3
On/Off button
Button S6 is directly connected to pin IMX_ONOFF of the TQMa8Xx. Pressing the button triggers the ON/OFF function of the
i.MX 8X.
3.9.4
GPI buttons
Two buttons (S2, S3) are available on the MBa8Xx for user-specific use. These buttons are connected to two GPIO pins of the
TQMa8Xx.
Table 46:
General Purpose buttons
Button
Signal
GPIO at TQMa8Xx
TQMa8Xx pin
Remark
S2
SWITCH_A#
GPIO1_IO13
X3-5
Low-active / pulled-up to V_1V8
S3
SWITCH_B#
GPIO1_IO14
X3-3
Low-active / pulled-up to V_1V8
3.9.5
Status LEDs
In addition to the status LEDs of the two Ethernet sockets, the MBa8Xx provides more indicator LEDs.
Table 47:
Status-LEDs
Function group
LED
Colour
Indication
Reset
V1
Red
Indicates the reset status of the des TQMa8Xx (at signal RESET_OUT#)
USB
V3
Green
Indicates the presence of VBUS for USB Host 2
V4
Green
Indicates the presence of VBUS for USB Host 3
V5
Green
Indicates the presence of VBUS for USB Host 4
V88
Green
Indicates the presence of VBUS for USB OTG
Mini PCIe
V7
Green
Shows the status of the WWAN# signal on the Mini-PCIe interface
V8
Green
Shows the status of the WLAN# signal on the Mini-PCIe interface
V9
Green
Shows the status of the WPAN# signal on the Mini-PCIe interface
User LEDs
V12
Green
Programmable LED (LED_A) on I²C GPIO Expander
(32)
V13
Green
Programmable LED (LED_B) on I²C GPIO Expander
Power
(33)
V14
Green
Indicates the presence of the external 24 V supply voltage (V_24V)
V15
Green
Indicates the presence of the internal 12 V supply voltage (V_12V)
V16
Green
Indicates the presence of the internal 5 V supply voltage (V_5V)
V17
Green
Indicates the presence of the internal 3.3 V supply voltage (V_3V3)
V18
Green
Indicates the presence of the internal 3.3 V supply voltage (V_3V3_MB)
V19
Green
Indicates the presence of the internal 3.3 V supply voltage (V_1V8)
V20
Green
Indicates the presence of the internal 3.3 V supply voltage (V_5V_USB)
V21
Green
Indicates the presence of the internal 3.3 V supply voltage (V_3V3_MPCIE)
V22
Green
Indicates the presence of the internal 3.3 V supply voltage (V_1V5_MPCIE)
Debug
V72
Green
Indicates the presence of an external USB supply voltage an X13
32:
For further information, see chapter 3.4.
33:
For details on the supply concept and the distribution of the internal supply voltages, refer to chapter 3.10.
