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User's Manual l TQMa6x & TQMa6xP UM 0403 l © 2019, TQ-Systems GmbH
Page 35
3.2.7.4
Power-Up sequence TQMa6x / carrier board
The TQMa6x operates with 5 V; the 3.3 V I/O voltages of the i.MX6 signals are generated on the TQMa6x.
This leads to requirements for the carrier board design concerning the chronological characteristics of the voltages generated on
the carrier board.
Note: Power-Up sequence on the carrier board
To ensure a correct Power-Up, the following sequence must be met on the carrier board:
The supply voltage of 5 V for the TQMa6x is present and the carrier board supply of 3.3 V
is activated by TQMa6x pin VCC3V3MB_EN (X2–26).
The following block diagram shows how VCC3V3MB_EN controls the voltage regulator on a carrier board.
TQMa6x
DC/DC 3V3
Startup time
≤
12 ms
VCC5V
VCC3V3MB_EN
ENABLE
VIN
VOUT
VIN
5 V
3.3 V
Illustration 17: Block diagram power supply carrier board
No modifications need to be made to carrier boards developed for TQMa6x revision 01xx using pin VCC3V3_REF_OUT (X2-56)
to activate the 3.3 V controller.
For re-designs or new designs, however, signal VCC3V3MB_EN (X2-26), available as of TQMa6x revision 02xx, is recommended.
Attention: Power-Up sequence
To avoid cross-supply and errors in the power-up sequence, no I/O pins may be driven by external
components until the power-up sequence has been completed.
The end of the power-up sequence is indicated by a high level of signal VCC3V3MB_EN.
3.3
TQMa6x interface
3.3.1
Pin multiplexing
When using the i.MX6 signals, the multiple pin configurations by different i.MX6-internal function units must be taken note of.
The pin assignment listed in Table 50, Table 51 and Table 52 refer to the corresponding
BSP provided by TQ-Systems GmbH
in combination with the Starterkit MBa6x. The electrical and pin characteristics are to be taken from the i.MX6 and PMIC
documentation (1), (2), (3), (4), (5), (6), and (10).
Attention: Malfunction or destruction
Depending on the configuration, many of the i.MX6 pins can provide several different functions.
Please take note of the information in the i.MX6 Reference Manuals (4), (5), and (6), concerning the
configuration of these pins before integration or start-up of your carrier board / Starterkit.
Improper programming by operating software can cause malfunctions, deterioration or destruction
of the TQMa6x.