A/D Converter Cautions; Example Of Method Of Reducing Current Consumption In Standby Mode - NEC PD78076 User Manual

15.5 A/D Converter Cautions

(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
be cut in order to minimize the overall system power dissipation. In Figure 15-9, the power dissipation can
be reduced by outputting a low-level signal to the output port in standby mode. However, there is no precision
to the actual AV
REF0
be used for relative comparison.
Figure 15-9. Example of Method of Reducing Current Consumption in Standby Mode
CHAPTER 15 A/D CONVERTER
voltage, and therefore the conversion values themselves lack precision and can only
V
Output Port
AV
REF0
. .
AV
= V
REF0 DD
AV
SS
pin at this time, this current must
REF0
DD
µ
PD78078, 78078Y
Series Resistor String
305