User's Manual l TQMaRZG2x UM 0100 l © 2021, TQ-Systems GmbH
Page 32
3.7
Housekeeping
The TQMaRZG2x uses a system controller for housekeeping and initialization functions. The system controller is also responsible
for power sequencing and voltage monitoring.
RZ/G2x
Voltage
Monitoring
DC/DC
DC/DC
DC/DC
...
EN
EN
EN
Connector
SW Debug
TQMARZG_RST_IN#
...
PORESET#
BOOT_CFG#
UART Konsole (optional)
PGOOD
Board-
Controller
JTAG_SRST#
Figure 13: Block diagram Housekeeping
3.7.1
Power sequencing
After activating the TQMaRZG2x 5 V supply and TQMARZG_RST_IN# to “High” the power-up sequence of the TQMaRZG2x starts.
After the successful completion of the power-up sequence PGOOD signals by a high level that circuit parts on the carrier board
can be supplied.
Attention: Destruction or malfunction, Power-Up sequence
To avoid cross-supplies and errors in the power-up sequence of the TQMaRZG2x, no I/O pins may be
externally supplied or driven until the power-up sequence of the I/O voltages on the TQMaRZG2x is
completed. At the same time, the carrier board component supply voltages must be stable. A high
level of PGOOD indicates the successful completion of the power-up sequence.
3.7.2
Voltage monitoring
On the TQMaRZG2x, all voltages are monitored for overvoltage and undervoltage.
