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| MC908AP8CFBE Datasheet, PDF (27/324 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Regulator Power Supply Configuration (VREG)
VDDA and VSSA are the power supply and ground pins for the analog circuits of the MCU. These pins
should be decoupled as per the digital power supply pins.
MCU
VDD
C1(a)
0.1 µF
+
C2(a)
VSS
VDDA
C1(b)
0.1 µF
+
C2(b)
VSSA
VDD
VDD
NOTE: Component values shown represent typical applications.
Figure 1-5. Power Supply Bypassing
1.7 Regulator Power Supply Configuration (VREG)
VREG is the output from the on-chip regulator. All internal logics, except for the I/O pads, are powered by
VREG output. VREG requires an external ceramic bypass capacitor of 100 nF as Figure 1-6 shows. Place
the bypass capacitor as close to the VREG pin as possible.
MCU
VREG
VSS
CVREGBYPASS
100 nF
Figure 1-6. Regulator Power Supply Bypassing
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
27
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