AT73C224-H_14 datasheet(7/75 Pages) ATMEL

Part #	AT73C224-H

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

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Manufacturer	ATMEL [ATMEL Corporation]

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7

6266A–PMAAC–08-Sep-08

AT73C224

Figure 4-3.

Application Schematic 3: BOOST in SEPIC Configuration (BUCK/BOOST)

In the Application Schematic 3, the BOOST (VO1) is in SEPIC configuration (BUCK/BOOST)

and generates a 3.3V output voltage for analog cells. The BUCK (VO2) supplies the core of the

microcontroller, and LDO4 supplies the I/Os.

Note that, in the SEPIC configuration, the maximum load current on VO1 should not exceed 300

mA.

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

C15

L3

Q1

BOOST1 = 3.3V

LDO4 = 1.8V

D1

3V

to

4.2V

1

32

C16

BOOST1 = 3.3V

Li_Ion

Battery

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AT73C224-H Datasheet(PDF) 7 Page - ATMEL Corporation

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