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參數(shù)資料
| 型號： | TDA5149 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip |
| 中文描述： | 12伏氯乙烯音圈電機(jī)驅(qū)動器和主軸電機(jī)預(yù)驅(qū)動芯片組合 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 148K |
| 代理商： | TDA5149 |
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1996 May 06
12
Philips Semiconductors
Product specification
12 V Voice Coil Motor (VCM) driver and
spindle motor pre-driver combination chip
TDA5149G
Table 5
Operating conditions for VCM_CTRL_1 and VCM_CTRL_0
Table 6
REG # 3: address 011; | not used | not used | PRESCALER_REG [2 to 0]
Note
1.
CLOCK (pin 58) must be valid before the end of the POR delay.
Table 7
Prescaler factors
Note
1.
Internal clock frequency is equal to external clock frequency divided by prescaler ratio.
Table 8
REG # 4: address 100; | STARTUP_REG[4 to 0] |
VCM_CTRL_1
VCM_CTRL_0
MODE
0
0
1
1
0
1
0
1
VCM operating
VCM brake
VCM park
VCM disable
DATA BIT
RESET
STATE
DESCRIPTION
(1)
PRESCALER_2
PRESCALER_1
PRESCALER_0
0
1
0
sets the division factor that is applied to the external clock (pin 58) in order to
obtain the appropriate internal clock frequency for the proper determination of the
commutation delays. The prescaling factors can be obtained as shown in Table 7
PRESCALER_REG
FREQUENCY (MHz)
(1)
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
1
2
4
8
16
32
64
128
DATA BIT
RESET
STATE
DESCRIPTION
STARTUP_4
STARTUP_3
STARTUP_2
STARTUP_1
STARTUP_0
0
0
0
0
0
The start-up timer instigates the spin-up in the absence of the back EMF zero
crossings. If the rotational speed is high enough, the commutations are
sequenced regardless of the start-up counter. But if no BEMF zero crossing
occurs, which is the case if the motor is stationary or rotating very slowly, the
start-up timer reaches its terminal count given by the STARTUP_REG, thereby
causing the next commutation. If t
IC
is the period of the internal clock then;
STARTUP delay = [(({0 to 31}
×
32) + 2)
×
511) + 2]
×
t
IC
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