TDA5149 datasheet(13/28 Pages) PHILIPS

13 / 28 page

1996 May 06

Philips Semiconductors

Product speciﬁcation

12 V Voice Coil Motor (VCM) driver and

spindle motor pre-driver combination chip

TDA5149G

Table 9

REG # 4: address 101; | WATCHDOG_REG[4 to 0] |

Table 10 REG # 6: address 110; | not used | not used | COMDELIM_REG[2 to 0] |

Table 11 Commutation delay limit

Note

1. Even COMDELIM _REG values must be avoided.

Table 12 REG # 7: address 111; | BLANK_REG[4 to 0] |

DATA BIT

RESET

STATE

DESCRIPTION

WATCHDOG_4

The watchdog timer checks for correct back EMF polarity, which indicates correct

rotation of the motor

WATCHDOG_3

WATCHDOG_2

WATCHDOG_1

WATCHDOG_0

DATA BIT

RESET

STATE

DESCRIPTION

COMDELIM_2

Defines the maximum commutation delay limit by setting the saturation value of the

zero crossing counter. tIC represents the period of the internal clock. Table 11

shows the delays which can be obtained.

COMDELIM_1

COMDELIM_0

COMDELIM_REG

COUNTER SATURATION VALUE

MAXIMUM COMMUTATION DELAY

111

2047

tIC × 1023

110; note 1

1535

tIC × 767

101

1023

tIC × 511

100; note 1

767

tIC × 383

011

511

tIC × 255

010; note 1

383

tIC × 191

001

255

tIC × 127

000; note 1

191

tIC × 95

DATA BIT

RESET

STATE

DESCRIPTION

BLANK_4

In the hard switching mode, the blank delay inhibits the back EMF comparator

outputs just at the moment the MOT outputs are commutating, until they have been

stabilized again. To avoid false zero-crossing detection, the blank delay operates in

the same way at the end of the ﬂy-back pulse (hard-switching mode), or at the end

of the soft-switching interval (soft-switching mode).

BLANK_3

BLANK_2

BLANK_1

BLANK_0

WATCHDOG delay

0 to 31

{

} 64

(

) 1

[

] t

BLANK delay

0 to 31

{

} 4

(

) 1

[

] t

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