MAS3549F datasheet(26/92 Pages) MICRONAS

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MAS 35x9F

DATA SHEET

June 30, 2004; 6251-505-1DS

Micronas

DCFR Register (reset = 00

hex)

DCFR

Battery Voltage Monitor

bit[15]

Comparison result (readback)

input voltage at pin VBAT above defined threshold

input voltage at pin VBAT below defined threshold

bit[14]

Number of battery cells

1 cell (range 0.8...1.5 V) (reset)

2 cells (range 1.6...3.0 V)

bit[13:10]

Voltage threshold level

1 cell

2 cells

1111

1.5

3.0 V

1110

1.45

2.9 V

...

0010

0.85

1.7 V

0001

0.8

1.6 V

0000

battery voltage supervision off (reset)

bit[9:8]

Reserved, must be set to 0

The result is stable 1 ms after enabling. The setup time for switching between

two thresholds is negligibly small.

For power management reasons, the battery voltage monitor should be

switched off by setting bit[13:10] to zero when the measurement is completed.

DC/DC Converter Frequency Control (PWM)

bit[7:4]

Reserved, must be set to 0

bit[3:0]

Frequency of DC/DC converter

Reference: 24.576

22.5792

18.432 MHz

0111

315.1

289.5

297.3 kHz

0110

323.4

297.1

307.2 kHz

0101

332.1

305.1

317.8 kHz

0100

341.3

313.6

329.1 kHz

0011

351.1

322.6

341.3 kHz

0010

361.4

332.0

354.5 kHz

0001

372.4

342.1

368.6 kHz

0000

384.0

352.8

384.0 kHz (reset)

1111

396.4

364.2

400.7 kHz

1110

409.6

376.3

418.9 kHz

1101

423.7

389.3

438.9 kHz

1100

438.9

403.2

460.8 kHz

1011

455.1

418.1

485.1 kHz

1010

472.6

434.2

512.0 kHz

1001

491.5

451.6

542.1 kHz

1000

512.0

470.4

576.0 kHz

If the audio codec is not enabled (bit[11] of the CONTROL register at I2C-sub-

address 6Ahex is zero), the clock for the DC/DC converters is directly derived

from the crystal frequency (nominal 18.432 MHz). Otherwise, the synthesizer

clock is used as the reference (please refer to the respective column in

Table 2–1 on page 11).

Table 3–3: Direct configuration registers, continued

I2C Sub-

address

(hex)

Function

Name

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