Cautions On A/D Converter - NEC 78014Y Series User Manual

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
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
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
www.DataSheet4U.com
CHAPTER 14 A/D CONVERTER
V
DD
Output Port
AV
REF
=
AV V
REF DD
Series Resistor String
AV
SS
PD78014, 78014Y
pin at this time, this current must be cut
REF
voltage is not so accurate
REF
259