AT73C224-B_14 datasheet(6/75 Pages) ATMEL

Part #	AT73C224-B

Description	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

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Manufacturer	ATMEL [ATMEL Corporation]

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6

6266A–PMAAC–08-Sep-08

AT73C224

Figure 4-2.

Application Schematic 2: Supply of a Microprocessor and External Analog Cells

In the Application Schematic 2, the AT73C224-B is used: the BOOST (VO1) supplies the

“VBUS” of one USB transceiver and supplies also LDO3 and LDO4. The BUCK(VO2) supplies

the digital core of the microcontroller and the LDOs supply the I/Os and Analog cells, such as

auxiliary ADC or PLL.

For external components, see Table 4-1.

AT73C224-B

Microcontroller

Analog Cells

VDD1

VSENSE1

DL1

DH1

VO1

GND2

GND/AVSS

VO3

GNDANA

VDD4

VO4

VBG

VDD0

Die

Paddle

VCAPN

VCAPP

VINT

VBAT

VO1

VDD3

VBAT

BUTTON

uP uP uP

nc

uP

ITB/RDY

VDDIO

VCORE

SPI / TWI

VO2

nc

VBAT

VO4

VBAT

BUCK2 = 1.2V

D1

D2 D3 D4

POK

R2

C11

C8

C14

C3

C5

C10

C7

C13

C2

L2

L1

R1

C1

C6

C4

C9

C12

Rechargeable

Backup

Battery

(NBL type)

VBAT

uP uP

X1

Q1

BOOST1 = 5V

LDO4 = 1.8V

D1

3V

to

4.2V

1

32

C16

BOOST1 = 5V

Li_Ion

Battery

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AT73C224-B Datasheet(PDF) 6 Page - ATMEL Corporation

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