MC68HC08JB1 Datasheet, PDF (28/216 Pages) Motorola, Inc – Microcontrollers

MCU
V_DD
V_SS
C_BYPASS
0.1 µF
+
C_BULK
V_DD
NOTE: Values shown are typical values.
Figure 1-3. Power Supply Bypassing
1.5.2 Voltage Regulator Out (V_REG)
V_REG is the 3.3 V output of the on-chip voltage regulator. V_REG is used
internally for the MCU operation and the USB data driver. It is also used
to supply the voltage for the external pullup resistor required on the
USB’s D– line. The V_REG pin requires an external bulk capacitor 4.7µF
or larger and a 0.1 µF ceramic bypass capacitor as Figure 1-4 shows.
Place the bypass capacitors as close to the V_REG pin as possible.
V_REG
MCU
V_SS
C_REGBYPASS
0.1 µF
+
C_REGBULK
> 4.7 µF
V_REG
Figure 1-4. Regulator Supply Capacitor Configuration
Technical Data
28
MC68HC08JB1 — Rev. 2.1
Freescale Semiconductor