TDA5149G Philips Semiconductors, TDA5149G Datasheet - Page 13

• Manufacturer Part Number: TDA5149G
• Description: 12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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] |
1996 May 06
WATCHDOG_4
WATCHDOG_3
WATCHDOG_2
WATCHDOG_1
WATCHDOG_0
COMDELIM_2
COMDELIM_1
COMDELIM_0
BLANK_4
BLANK_3
BLANK_2
BLANK_1
BLANK_0
12 V Voice Coil Motor (VCM) driver and
spindle motor pre-driver combination chip
DATA BIT
DATA BIT
DATA BIT
COMDELIM_REG
110; note 1
100; note 1
010; note 1
000; note 1
101
011
001
111
RESET
RESET
RESET
STATE
STATE
STATE
0
0
0
0
0
0
0
0
0
0
0
0
0
The watchdog timer checks for correct back EMF polarity, which indicates correct
rotation of the motor
WATCHDOG delay
Defines the maximum commutation delay limit by setting the saturation value of the
zero crossing counter. t
shows the delays which can be obtained.
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
COUNTER SATURATION VALUE
=
=
0 to 31
2047
1535
1023
767
511
383
255
191
13
IC
represents the period of the internal clock. Table 11
0 to 31
4
DESCRIPTION
DESCRIPTION
DESCRIPTION
+
1
64
t
+
IC
1
MAXIMUM COMMUTATION DELAY
t
IC
t
IC
t
t
t
t
t
t
IC
IC
IC
IC
IC
IC
t
IC
Product specification
1023
TDA5149G
767
383
255
191
127
511
95