TC1724 Datasheet, PDF (93/134 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

5.3.2 Power Sequencing 5V Supply Only
TC1724
Electrical Parameters
V
5V
3.3V
5.5V
4.0V
3.63V
2.97
1.43V
1.3V _1.17V
t
PORST (output)
PORST (input)
AB
C
D
E
t
Power-Up_EVR_1.vsd
Figure 13 5 V / 3.3 V / 1.3 V Power-Up/Down Sequence
The events for the above points in the power-up/down sequence
• A :external supplied voltage reaches operating level
• B: external supplied and internal generated voltages reaches operating levels
• C: internal generated voltage drops below operating level
• D: internal generated voltage resumes operating level
• E: external supplied voltage leaves operating level
P0.4 and P0.5 should be kept at the selected setting of '0' or '1' until external supplied
voltage has reached its operating level.
The following list of rules applies to the power-up/down sequence:
• All ground pins V_SS must be externally connected to one single star point in the
system. Regarding the DC current component, all ground pins are internally directly
connected.
• The latch-up risk is minimized if the I/O currents are limited to:
– 20 mA for one pin group
– AND 100 mA for the completed device I/Os
Data Sheet
5-48
V1.2, 2014-06