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Rev. 1.0, 07/01, page 274 of 372
18.2 When Not Using the Internal Power Supply Step-Down Circuit
When the internal power supply step-down circuit is not used, connect the external power supply
to the V
CL
pin and V
CC
pin, as shown in figure 18-2. The external power supply is then input
directly to the internal power supply. The permissible range for the power supply voltage is 3.0 V
to 3.6 V. Operation cannot be guaranteed if a voltage outside this range (less than 3.0 V or more
than 3.6 V) is input.
V
CL
V
SS
Internal
logic
Step-down circuit
Internal
power
supply
V
CC
V
CC
= 3.0 to 3.6 V
Figure 18-2 Power Supply Connection when Internal Step-Down Circuit is not Used