μ
PD720231
7.
How to Connect to External Elements
R19UH0094EJ0100 Rev 1.00
Page 30 of 30
Mar 1, 2013
7.8
On-Chip Switching Regulator (3.3 V to 1.0 V) Connection
Figure 7-8. On-Chip Switching Regulator Pin Connection
Remark
It is mandatory to put ceramic capacitors (22
μ
F is recommended) on AVDD33IN1 and
AVDD33IN2. Common impedance coupling between AVDD33IN1 and AVDD33IN2 must be
avoided.
In case of not using internal switching regulators, please handle each pins as in Figure 7-9.
Figure 7-9. On-Chip Switching Regulator Pin Connection (out of use)
µPD720231
FB
LX1
1.0 V
VDD10
SW Regulator
0.1 µF
4.7 µH
AVDD33IN1
AVDD33IN2
22 µF
3.3 V
22 µF
Schottky
Barrier
Diode
3.3 V
22 µF
µPD720231
FB
LX1
1.0 V
VDD10
SW Regulator
Open
AVDD33IN1
AVDD33IN2
22 µF
3.3 V
10 µF
1.0 V
