User's Manual l MBa8Xx UM 0100 l © 2020, TQ-Systems GmbH
Page 45
3.10.2
Power sequencing
The MBa8Xx allows power sequencing of the voltage levels used. Except for V_3V3 and V_5V_USB all voltages are switched on
after the boot process of the TQMa8Xx.
TQMa8Xx
V_1V8_OUT
Level
Shifter
LM25119
(V_5V)
LM25119
(V_1V8)
PFET
(V_3V3_MB)
VCC_MB_EN
optional
GPIO0_IO30
GPIO0_IO31
V_1V5_MPCIE_EN
LT3503
(V_1V5_MPCIE)
V_3V3_MPCIE_EN
FDC6331
(V_3V3_MPCIE)
PCA9538A
IO_6
V_12V_EN
TPS54335
(V_3V3_MPCIE)
Figure 23: Block diagram Enable signals for Power Sequencing
From Figure 23, the following sequencing of the various voltage levels on the MBa8Xx is given, not considering the rise times of
the voltages: