TDA5149G Datasheet, PDF (12/28 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 5 Operating conditions for VCM_CTRL_1 and VCM_CTRL_0
VCM_CTRL_1
0
0
1
1
VCM_CTRL_0
0
1
0
1
MODE
VCM operating
VCM brake
VCM park
VCM disable
Table 6 REG # 3: address 011; | not used | not used | PRESCALER_REG [2 to 0]
DATA BIT
PRESCALER_2
PRESCALER_1
PRESCALER_0
RESET
STATE
0
1
0
DESCRIPTION⁽¹⁾
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
Note
1. CLOCK (pin 58) must be valid before the end of the POR delay.
Table 7 Prescaler factors
PRESCALER_REG
000
001
010
011
100
101
110
111
FREQUENCY (MHz)⁽¹⁾
1
2
4
8
16
32
64
128
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] |
DATA BIT
STARTUP_4
STARTUP_3
STARTUP_2
STARTUP_1
STARTUP_0
RESET
STATE
0
0
0
0
0
DESCRIPTION
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
1996 May 06
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