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AT73C224
4. Application examples
Figure 4-1.
Application Schematic 1: Microcontroller with 5V VBUS for 2 USB Host Transceivers
LDO3 = 2.7V
R2
Rechargeable
Backup
Battery
(NBL type)
C11
32
X1
uP uP uP
C12
C4
V BAT
C9
(AUX ADC, PLL)
LDO4 = 2.8V
VDDIO
C3
C14
C8
C5
V BAT
V BAT
1
nc
VO3
VDD3
GNDANA
VCAPP
AT73C224-A
VINT
VDD0
VO4
VDD4
VDD1
VSENSE1
DL1
DH1
nc
R1
L1
D1
Q1
V BAT
VO1
C6
C1
Microcontroller
nc
VCAPN
VO1
C10
VBG
GND2
BOOST1 = 5V
USB HOST
transceiver
(VBUS USB)
GND/AVSS
V BAT
V BAT
C7
V BAT
C13
uP uP uP
Pushbutton
L2
Die
Paddle
USB HOST
transceiver
3V
to
4.2V
Li-Ion
Battery
VO2
C2
C16
BUCK2 = 1.8V
VCORE
SPI / TWI
POK ITB/RDY D1
D2 D3 D4
In the Application Schematic 1, the AT7373C224-A is used: the BOOST(VO1) supplies the
“VBUS” of two USB transceivers, the BUCK(VO2) supplies the digital core of the microcontroller,
the LDO3 supplies the I/Os of the microcontroller and LDO4 supplies analog cells, such as aux-
iliary ADC or PLL.
5
6266A–PMAAC–08-Sep-08
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