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CHAPTER 14 A/D CONVERTER
259
14.5 Cautions on A/D Converter
(1) Current consumption in standby mode
The A/D converter operates on the main system clock. Therefore, its operation stops in STOP mode or in HALT
mode with the subsystem clock. As a current still flows in the AV
REF
pin at this time, this current must be cut
in order to minimize the overall system power dissipation. In this example, the power dissipation can be reduced
if a low level is output to the output port in the standby mode. However, the actual AV
REF
voltage is not so accurate
and, accordingly, the converted value is not accurate and should be used for relative comparison only.
Figure 14-8. Example of Method of Reducing Power Dissipation in Standby Mode
PD78014, 78014Y
Series Resistor String
AV
SS
AV
REF
V
DD
AV
REF
V
DD
Output Port
=
µ
Содержание 78014Y Series
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