LDIC LD7000 Datasheet
LD7000
Spindle/VCM Controller and Pre-driver
DESCRIPTION
The LD7000 Servo and Spindle Predriver, a CMOS
monolithic integrated circuit housed in a 64-lead
TQFP package operates from +5 V and +12 V
supplies. It is designed to drive a voice coil actuator
and a 3-phase, Hall-sensorless motor with external
power MOSFETs. The device is intended for use in
12 V disk drive applications.
The actuator driver includes a saturation detector to
monitor the loop compensation amplifier for
saturation, an uncommitted opamp for input signal
conditioning, a voltage reference to provide a precise
voltage level for internal PWM buffers, and reduced
power dissipation.
The spindle driver includes a µP controlled startup
ramp to replace the imprecise analog ramp, an
external PWM input to allow PWM frequencies
above the audible range, active pullup on the P
driver, adjustable N-channel slew rate, and improved
spindle brake performance.
A precision low voltage monitor circuit is also added
to monitor +5 V and +12 V supplies and to initiate
servo head retracts during voltage faults. All
functions are controlled by an SSI compatible
read/write serial port.
FEATURES
• Small footprint 64 or 48 pin TQFP package
• Spindle driver is PWM during run and start
• Commutator is driven by a phase lock loop for
high jitter immunity
• Adjustable slew rate to minimize stress in the
power MOSFETs
• Microprocessor controlled spindle startup
• Saturation detector to monitor loop
compensation amplifier status
• Precision low voltage monitor circuitry for both
+5 V and +12 V supplies, LD7000 only
• Dual level retract scheme includes adjustable
pulse mode, LD7000 only
• Serial Port control
Three DC-DC converter circuits for 2.5V,3.3V,&-3/5Vsupplies are also available for digital chips and
MR bias negative supply.
version 2.1
LD7000
Spindle/VCM Controller and Pre-driver
VREF
A3
A3N
A3P
RETRB
BRAKEB
CVCO
SDEN
SDAT
SCLK
RVCO
RC
IM
1
2
3
4
5
6
7
8
9
10
11
12
ERRM
ERR
ERRM
VNA
ERR
N/C
48
45
46
47
48-Lead TQFP
LD7000
131615
14
COS
ISENSE
RPH
ENABLEB
SOLS
VNA
SE2
SE1
SE2
SE1
44
43
172019
18
ADVANCE
RESET
SOUT
VR2
SOUT
N/C
41
42
PWMIN
DISPWRB
RM
SATB
VP
40
39
212423
22
VCC
SENSOR
VP
RL
OUTB
OUTA
37
38
36
35
34
33
32
31
30
29
28
27
26
25
VP
VND
MARGINB
OUTB
OUTA
SE3
OUTC
OUTD
N/C
CBRAKE
RSR
P1
P2
P3
N1
N2
N3
SE3
52
56
60
64
61
62
63
A3
V5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
RC
18
RPH
19
20
ISENSE
RETRD
VREF
A3N
A3P
SATB
RETRB
BRAKEB
CVCO
VBG
VCCHKL
VCCTH
SDEN
SDAT
SCLK
RVCO
This document may contain preliminary information and is subject to change by LDIC without notice. LDIC assumes no responsibility or liability for any use of this information herein. Nothing
in this document shall operate as an express or implied license of indemnity under the intellectual property rights of LDIC or third parties. NO WARRENTIES OF ANY KIND, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIES WARRENTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE OFFERED IN THIS DOCUMENT.
57
58
59
64-Lead TQFP
LD7000
23
22
21
24
VPSNS
ENABLEB
COS
SE1R
55
26
25
ADVANCE
RESET
53
54
27
28
PWMIN
DISPWRB
50
51
31
30
29
WRINHB
VCC
SENSOR
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
FAULTB
OUTC
OUTD
IL
CBRAKE
RSR
VCCHKH
V12CHK
V12
P1
P2
P3
N1
N2
N3
VND
VP
Page 19 version 2.1
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