Cautions - NEC V850ES/SA2 UPD703201 Manual

11.4.3 Cautions

Observe the following cautions when using the D/A converter of the V850ES/SA2 and V850ES/SA3.
(1) Do not change the set value of the DACSn register while the trigger signal is being issued in the real-time
output mode.
(2) Before changing the operation mode, be sure to clear DACEn to 0.
(3) When using the P80/ANO0 and P81/ANO1 pins as port pins, make sure that their input level does not change
much.
(4) Make sure that V
DD
guaranteed.
(5) Apply power to AV
DD
(6) No current can be output from the ANOn pin (n = 0, 1) because the output impedance of the D/A converter is
high. When connecting a resistor of 5 MΩ or less, insert a JFET input operational amplifier between the
resistor and the ANOn pin.
CHAPTER 11 D/A CONVERTER
= EV = AV = AV = 2.2 to 2.7 V. If this range is exceeded, the operation is not
DD DD REF1
at the same timing as V .
DD
Figure 11-2. External Pin Connection Example
ANOn
AV
DD
0.1 F
AV
SS
AV
REF1
0.1 F
Preliminary User's Manual U15905EJ1V0UD
−
Output
+
JFET input
operational amplifier
EV
DD
µ
µ
10 F
µ µ
10 F
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