TPIC2060A Datasheet, PDF (45/65 Pages) Texas Instruments – Serial I/F Controlled 9-Channel Motor Driver for ODD

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312 kHz /3.2 µs (PW M 1 cycle)
TPIC2060A
SLIS166 – JULY 2015
Track
Focu s
R
R
R
R
R
Tilt
Sled 1
Sled 2
SPM
Lo a d
Step 1
Step 2
Co n tro l
reg ister
400 kHz / 2.5 µs
100KHz / 10us (1control cycle)
DACcom m an d
PWM cycle
R DAC com m an d with statu s read
0.51 µs (SCLK: 35 M Hz) for d ata tran sm it
Con trol reg ister com m an d
Figure 51. Example DAC Control
9.1.5 Spindle Motor Driver Operating Sequence
When the VSPM is set to a positive DAC code, it goes into acceleration mode. Initial position sense (IS) mode
then operates, the start-up circuits offer a start-up pattern sequence to the driver, and then switch to spin-up
mode by detecting the rotor position through BEMF signal from the spindle motor coil.
The spin-down and brake functions are also controlled by the DAC value, VSPM. When the brake command to
VSPM is set, the driver goes into active-brake mode, switches to short-brake mode in slow revolution speed, and
then stops automatically. The FG signal is composed from EXOR of a three-phase signal and is output from XFG
pin shown in Figure 52.
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