TDA5149G Datasheet, PDF (13/28 Pages) NXP Semiconductors – 12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip

Philips Semiconductors
12 V Voice Coil Motor (VCM) driver and
spindle motor pre-driver combination chip
Product specification
TDA5149G
Table 9 REG # 4: address 101; | WATCHDOG_REG[4 to 0] |
DATA BIT
WATCHDOG_4
WATCHDOG_3
WATCHDOG_2
WATCHDOG_1
WATCHDOG_0
RESET
STATE
0
0
0
0
0
DESCRIPTION
The watchdog timer checks for correct back EMF polarity, which indicates correct
rotation of the motor
WATCHDOG delay = [ ( {0 to 31} × 64) + 1] × t_IC
Table 10 REG # 6: address 110; | not used | not used | COMDELIM_REG[2 to 0] |
DATA BIT
COMDELIM_2
COMDELIM_1
COMDELIM_0
RESET
STATE
0
0
0
DESCRIPTION
Defines the maximum commutation delay limit by setting the saturation value of the
zero crossing counter. t_IC represents the period of the internal clock. Table 11
shows the delays which can be obtained.
Table 11 Commutation delay limit
COMDELIM_REG
111
110; note 1
101
100; note 1
011
010; note 1
001
000; note 1
COUNTER SATURATION VALUE
2 047
1 535
1 023
767
511
383
255
191
Note
1. Even COMDELIM _REG values must be avoided.
MAXIMUM COMMUTATION DELAY
t_IC × 1023
t_IC × 767
t_IC × 511
t_IC × 383
t_IC × 255
t_IC × 191
t_IC × 127
t_IC × 95
Table 12 REG # 7: address 111; | BLANK_REG[4 to 0] |
DATA BIT
BLANK_4
BLANK_3
BLANK_2
BLANK_1
BLANK_0
RESET
STATE
0
0
0
0
0
DESCRIPTION
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 delay = [ ( {0 to 31} × 4) + 1] × t_IC
1996 May 06
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