Shock sensor signal processing IC
BU3892FV
1.15
±
0.1 6.4
±
0.3
0.1
4.4
±
0.2
Description
The BU3892FV is an IC developed for shock detection
of hard disk. 2-channel signal processing circuit are
incorporated. For 1st STAGE, signal from shock sensor
is amplified by Op amp. The amplification degree and
the value of filtering are determined by external elements.
For 2nd STAGE, output of 1st STAGE is amplified by x10
inverting amplifier. The signal is inputted to window
comparators and shock detection is started.
Features
1) 5V single supply
2) Built-in 7 operational amplifiers and 4 comparators
3) Low input bias current due to CMOS process
4) Low power consumption mode
Applications
Hard disk
Absolute Maximum Ratings (Ta=25˚C)
Parameter
Supply voltage
Power dissipation
Storage temperature range
Input voltage
Output voltage
Operating temperature range
Symbol
V
DD
Pd
Tstg
V
IN
V
OUT
T
OPR
–55
–0.3
–0.3
0
–0.3
Limits
300
∗
~
~
~
~
~
+7.0
+125
V
DD
+0.3
V
DD
+0.3
+70
Dimension (Unit : mm)
5.0
±
0.2
0.3Min.
0.15
±
0.1
16
9
1
8
0.65
0.1
0.22
±
0.1
SSOP-B16
Unit
V
mW
˚C
V
V
∗
Derating : 3.0mW/˚C for operation above Ta=25˚C
∗
This product is not designed for protection against radioactive rays.
˚C
Parameter
Supply voltage
Recommended Operating Conditions (Ta=25˚C)
Symbol
V
DD
V
IL
V
IH
Min.
4.5
3.5
Typ.
-
-
-
Max.
5.5
1.5
V
DD
+0.3
Unit
V
V
V
Input L voltage range
Input H voltage range
-0.3
Electrical characteristics (
Unless otherwise noted; Ta=25˚C, V
DD
=4.5~5.5V)
Parameter
<FIRST STAGE>
Input bias current
Max. output current
Supply voltage rejection ratio
Gain band width
Max. amplitude voltage gain
<REFERENCE INPUT>
Input current
Output impedance
<SECOND STAGE>
Input current
A2in, B2in
"H" threshold voltage
A2in, B2in
"L" threshold voltage
A2in, B2in
<TOTAL>
Recovery time from Power Down
Current consumption
T
RCVRY
I
DD
–
–
–
–
4
15
1
6.5
100
ms
mA
µA
II
2nd
DVH
2nd
DVL
2nd
–11
+0.04
– 0.06
–16
+0.05
– 0.05
–22
+0.06
– 0.04
µA
V
II
REF
RO
REF
–
–
–
–
10
30
µA
Ω
Reference Input=2V
Reference Input=2V
Input current when (Reference input—0.2V)
voltage is applied.
Reference Input=2V
-Clear Shocked=GND level
Relative value with Reference Input
Time when it can be operated in the specification
range after Power Down become "L".
Power Down "L" input
Power Down "H" input
(Ta=25˚C)
(Ta=75˚C)
Symbol
IIB
1ST
IO
1
ST
SVR
1
ST
GB
1
ST
AV
1
ST
Min.
–
–
0.5
65
–
10
Typ.
1
–
–
–
1.4
–
Max.
20
2000
–
–
–
–
Unit
pA
mA
dB
MHz
V/mV
Conditions
Measurement between Ain+, Ain-, Bin+, Bin-
and GND.
Note) Shocked outputs "H" when Power Down becomes "L".
Application Circuit
Bin+
16
Bin-
15
Bout
-
+
14
VDD
13
B2in
12
-Clear shocked
11
shocked
10
N.C
9
1st STAGE
OP-AMP
10k
-
COMPARATOR
100k
+
-
+
-
+
-
+
-
30k
BU3892FV
2nd STAGE
OP-AMP
COMPARATOR
30k
-
30k
2nd STAGE
OP-AMP
+
COMPARATOR
-
+
100k
COMPARATOR
+
-
+
10k
10k
1st STAGE
OP-AMP
+
-
Aout
3
GND
4
-
5
Reference
Output
6
Reference
Input
+
Ain+
1
Ain-
2
A2in
7
8
Power
Down
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0
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