L6260 データシートの表示（PDF） - STMicroelectronics
部品番号
コンポーネント説明
メーカー
L6260 Datasheet PDF : 30 Pages
| |||
L6260
VCM DAC Register (Reg 1)
The VCM DAC register is used to control the cur-
rent in the voice coil motor. All 10 bits are part of
a resistor divider network. Bit 10 is the sign bit
and logically controls the current direction through
the VCM. Bit 11 selects the current sense resistor
to use for current control. A 0 selects coarse and
therefore only the lower sense resistor, a 1 se-
lects the top of both resistors so that the sense
resistor is the sum of the coarse and fine resis-
tance’s.
To clarify the manner in which the 2’s comple-
ment is used here are some examples:
Value entered to
register (0x means hex)
0x000
0x800
0x3FF
0x400
0x401
0x7FF
DAC value
0x000
0x000
0x3FF
0x3FF
0x3FF
0x001
Sign
+
+
+
-
-
-
Gain
0
1
0
0
0
0
Reg: 1
Name: VCM DAC Register
Type: Write only.
BIT
LABEL
0 VDAC BIT 0
1 VDAC BIT 1
2 VDAC BIT 2
3 VDAC BIT 3
4 VDAC BIT 4
5 VDAC BIT 5
6 VDAC BIT 6
7 VDAC BIT 7
8 VDAC BIT 8
9 VDAC BIT 9
10 VCMSIGN
11 VCMGAIN
DESCRIPTION
LSB resistor ladder of the 10 bit VCM DAC. This is a true unsigned
representation of the DAC input. The value entered here is a 2s-
complement of the required DAC value encoded across eleven bits
(10 bit data and 1 sign bit encoded into 11 bits in 2s-complement)
MSB resistor ladder.
Sign bit of the above 2s-complement number.
This changes the gain of the VCM DAC
@POR
0
0
0
0
0
0
0
0
0
0
0
0
Spin Control Register (Reg 2)
The spin control register has two functions:
(1) The first (bits 0-7) is to program the current to
the spindle motor to allow motor control and
to preset the ”at speed” voltage for the charge
pump.
(2) The second (bits 8-11) is to set the phase lag
from when a BEMF zero crossing occurs to
the next commutation. Nominally the delay
would be 30 electrical degrees but it often is
better to advanced the commutation, due to
the presence of other sources of delay, re-
lated to switching. The range is from 1.875
through to 28.125 electrical degree delay at
1.875 degree increments.
Reg: 2
Name: Spin Control Register
Type: Write only.
BIT
LABEL
0 SPIN_DAC BIT 0
1 SPIN_DAC BIT 1
2 SPIN_DAC BIT 2
3 SPIN_DAC BIT 3
4 SPIN_DAC BIT 4
5 SPIN_DAC BIT 5
6 SPIN_DAC BIT 6
7 SPIN_DAC BIT 7
8 SPINDLY BIT 0
9 SPINDLY BIT 1
10 SPINDLY BIT 2
11 SPINDLY BIT 3
DESCRIPTION
Spindle current limit LSB (LSB of 8 bits written to the spindle DAC)
Spindle current limit MSB
Spindle commutation delay LSB
Spindle commutation delay MSB
@POR
0
0
0
0
0
0
0
0
0
0
0
0
10/30
Share Link: 