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TDA5149G Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. TDA5149G
Description  12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 9 page
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1996 May 06
9
Philips Semiconductors
Product speciļ¬cation
12 V Voice Coil Motor (VCM) driver and
spindle motor pre-driver combination chip
TDA5149G
Power-on/power-off reset
The power-on reset circuitry monitors the analog, digital
and general supplies. The voltage thresholds have been
set internally for both supplies, i.e. 4.4 V for VDDA and
VDDD, and 10.5 V for VDD. External adjustment and
filtering, to suppress supply spikes, has been made
possible through the pins POR5ADJ and POR12ADJ.
When either of the supplies falls below their threshold
levels, the reset circuit provides two active LOW output
signals. The RESETA signal is a full CMOS output and the
RESETP signal has an active pull-down MOS transistor
with a passive pull-up resistance of 10 k
ā„¦. The latter can
be used for emulation purposes. Both signals remain LOW
until the supply voltages are again above the threshold
level, delayed by a time constant period that is determined
by the value of the capacitor connected to pin PORDELAY.
A park sequence is initiated on a reset fault. This includes
disabling the actuator latch drivers and starting a delayed
spindle brake operation by switching on the low side
pre-drivers simultaneously. This brake delay is determined
by an external RC combination connected to
BRAKEDELAY. Actuator PARK and spindle BRAKE can
also be controlled via the serial port.
At power-up, the two reset output signals (RESETA and
RESETP) will remain LOW as long as either supply
voltage is below the specified threshold plus the hysteresis
voltage. Once the supply voltages are above their specific
trip levels, the two reset signals become HIGH after the
power-on reset delay (PORDELAY). This delay time is
determined by the value of the capacitor connected to the
PORDELAY pin.
Powerless park/brake
As with the normal retract procedure, an actuator park
sequence is initiated whenever a power-down situation
occurs. The power-on/power-off reset circuit generates the
two active LOW reset signals and also activates the VCM
park circuit. The VCM park circuit provides a voltage,
retrieved from the rectified back EMF voltage of the
running-out spindle, of 1.2 V (typ.) to the VCM pin.
The voltage at pin VCM+ is 0 V. This voltage is supplied by
the capacitor CCLAMP that is connected to the CLAMP pin.
This capacitor smooths the rectified back EMF and stores
the electrical energy generated by the motor.
To ensure that the stored energy in the clamp capacitor is
only used for the park operation, the CLAMP input must be
isolated from the power supply. This can be achieved by
using a Schottky diode or a reverse connected N-channel
power FET (see Fig.1). The TDA5149G provides an
output H0 to control this power FET.
At power-down the brake delay circuit is also enabled.
The brake delay circuit is supplied by the energy stored in
the capacitor (charged during normal operation from VDD)
that is connected to the BRAKEPOWER pin. Both the
BRAKEDELAY and BRAKEPOWER pins are then isolated
from the 12 V supply voltage. When the voltage on the
BRAKEDELAY pin reaches a value of 1.6 V (typ.), the
low-side external power FETs are turned on to brake the
spindle motor. The BRAKEPOWER capacitor then
supplies the current to keep the power FETs conducting.
This means that the voltage on this capacitor decreases
with time.
Serial port
The serial port is used to modify the various operational
modes of the TDA5149G and to adjust the timing
parameters to ensure the proper commutation sequence
of the spindle motor. It is a synchronous, slave only,
three-wire communication port with data (SDATA), clock
(SCLOCK) and enable (SENABLE) inputs.
The serial port requires the data to be sent in bytes, the
LSB (data 0) to be sent first and the MSB (address 2) last.
The three most significant bits (MSBs) determine the
register address, the remaining five bits represent the
data, which means up to 8 registers can be independently
addressed.
When SENABLE is LOW, the serial port is disabled and
the IC is not affected by any change both on SDATA and
SCLOCK. When SENABLE is HIGH the data is written
serially to the shift register on the rising edge of SCLOCK.
When SENABLE goes LOW the shifting sequence is
stopped and the last 8 bits that are clocked in are latched
into the appropriate control register. Therefore, the
transmission of two consecutive bytes requires that
SENABLE is LOW for at least a duration of ā€˜tā€™
(see Chapter ā€œCharacteristicsā€).




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