AT73C224-B_14 Datasheet, PDF (5/75 Pages) ATMEL Corporation – Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

AT73C224
4. Application examples
Figure 4-1. Application Schematic 1: Microcontroller with 5V VBUS for 2 USB Host Transceivers
Rechargeable
Backup
Battery
(NBL type)
R2
X1
C11
32
uP uP uP
V_BAT
C12
C4 C9
1
V_BAT
C3 C8
VO3
VDD3
GNDANA
VO4
VDD4
VDD1
nc VCAPP _AT73C224-A VSENSE1
C14
V_BAT
C5
VINT
VDD0
DL1
DH1 nc
nc VCAPN
VO1
VBG
C10
GND2
V_BAT
3V
to
4.2V
Li-Ion
Battery
V_BAT
C7
V_BAT
C13
uP uP uP
Pushbutton L2
GND/AVSS
Die
Paddle
VO2
C2 C16
LDO3 = 2.7V
(AUX ADC, PLL)
LDO4 = 2.8V
V_{BAT C6}
R1
D1
L1
VO1
C1
Q1
VDDIO
Microcontroller
BOOST1 = 5V
(VBUS USB)
USB HOST
transceiver
USB HOST
transceiver
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.
For external components, see Table 4-1.
5
6266A–PMAAC–08-Sep-08