Preliminary User's Manual l TQMaX4XxL UM 0001 l © 2022, TQ-Systems GmbH
Page 20
Attention: Malfunction
If the absolute maximum voltages of the CPU are exceeded, malfunctions and component failures may
occur. The mentioned outputs may not be supplied externally under any circumstances.
3.2.11.3
Power sequenzing
After switching on the module supply V_5V_IN and TQMaX4XxL_HARD_RST# to HIGH the power-up sequence starts. With
completion of the power sequencing the supply of the external mainboard components is signaled via TQMaX4XxL_PGOOD.
The following figure shows the chronological sequence of the signals involved.
Figure 16:
Recommended power up sequence
Attention: Malfunction
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 is completed. The end of the power-up sequence is signaled
by a high level of the TQMaX4XxL_PGOOD signal.
3.2.11.4
Power modes
The TQMaX4XxL has the following power modes:
•
Active Mode - The module is powered and everything is active.
•
Standby Mode - Main processor cores in WFI/WFE mode, the rest in idle.
More information can be found in the AM64x / AM243x Reference Manual (3)
Independent of the CPU, the following low power modes can still be provided:
•
Module RTC Mode
o
Module is no longer supplied via V_5V_IN
o
Only the V_RTC_IN remains supplied and active
o
The current consumption is then only determined by the current consumption of the RTC
•
Self-Refresh Mode (Suspend to RAM)
o
The LPDDR4 memory can be put into self-refresh mode by an SRE command
o
IDD6 is specified in self refresh, typ. current consumption at 25 °C ambient temperature is approx. 0.4 mA to
2.7 mA
