CHAPTER 7-2: VBAT Domain(A)
268 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
3. Chip Power Supply Control
This section explains details of applying and cutting off chip power supply.
Table of Combinations of VCC Power Supply and VBAT Power Supply
Table 3-1 shows the respective states of the VCC power supply and the VBAT power supply.
Table 3-1 Combination of VCC Power Supply State and VBAT Power Supply State
Driving VBAT Power Supply and VCC Power Supply with Same Power Supply
Transition of power supply state
If the VBAT power supply and the VCC power supply are driven by the same power supply, the chip
power supply state transits between "normal operation" and "stop of operation" shown in Table 3-1.
When driving the VBAT power supply and the VCC power supply with the same power supply, initialize
the VBAT Domain whenever applying the VCC power supply.
Figure 3-1 Example of driving VBAT power supply with VCC power supply
If not using the backup power supply for the VBAT power supply, connect the VBAT power supply pin
directly to the VCC power supply pin outside the chip.
If the VBAT power supply pin is directly connected to the VCC power supply pin, the prohibited
combination of "VCC power supply on and VBAT power supply off" can be avoided.
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