MAS3549F datasheet(25/92 Pages) MICRONAS

25 / 92 page

DATA SHEET

MAS 35x9F

Micronas

June 30, 2004; 6251-505-1DS

DCCF Register (reset = 5050

hex)

DCCF

DC/DC Converter 2

bit[15]

PUP2: Voltage monitor 2 flag (readback)

bit[14:11]

Converter 2 output voltage with respect to VREF2)

Code

Nominal

set level

reset level

output volt. of PUP2

of PUP2

1111

3.5 V

3.4 V

3.3 V

1110

3.4 V

3.3 V

3.2 V

1101

3.3 V

3.2 V

3.1 V

1100

3.2 V

3.1 V

3.0 V

1011

3.1 V

3.0 V

2.9 V

1010

3.0 V

2.9 V

2.8 V (reset)

1001

2.9 V

2.8 V

2.7 V

1000

2.8 V

2.7 V

2.6 V

0111

2.7 V

2.6 V

2.5 V

0110

2.6 V

2.5 V

2.4 V

0101

2.5 V

2.4 V

2.3 V

01001)

2.4 V

2.3 V

2.2 V

00111)

2.3 V

2.2 V

2.1 V

00101)

2.2 V

2.1 V

2.0 V

bit[10]

Mode

pulse frequency modulation (PFM)

pulse width modulation (PWM) (reset)

bit[9:8]

Reserved, must be set to zero

The DC/DC converters are up-converters only. Thus, if the battery voltage is

higher than the selected nominal voltage, the output voltage will exceed the

nominal voltage.

DC/DC Converter 1

bit[7]

PUP1: Voltage monitor 1 flag (readback)

bit[6:3]

Converter 1 output voltage at VSENS1 with respect to VREF

(see bits 14 to 11)2)

bit[2]

Mode

pulse frequency modulation (PFM)

pulse width modulation (PWM) (reset)

bit[1:0]

Reserved, must be set to zero

Note, that the reference voltage for DC/DC converter 1 is derived from the

main reference source supplied via pin AVDD1. Therefore, if this DC/DC con-

verter is used, its output must be connected to the analog supply.

The DC/DC converters are up-converters only. Thus, if the battery voltage is

higher than the selected nominal voltage, the output voltage will exceed the

nominal voltage.

1) refer to Section 4.3.3. on page 60

2) refer to Section 2.11.2.1.

Table 3–3: Direct configuration registers, continued

I2C Sub-

address

(hex)

Function

Name

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