AK8776 [AKM]
Hall IC for Pulse Encoder; 霍尔IC的脉冲编码器
| 型号： | AK8776 |
| 厂家： | 
ASAHI KASEI MICROSYSTEMS |
| 描述： | Hall IC for Pulse Encoder |
| 文件： | 总11页 (文件大小：157K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
[AK8776]
AK8776
Hall IC for Pulse Encoder
Overview
AK8776 is a Hall effect latch which detects both “vertical” and “horizontal” (perpendicular and parallel to the
marking side of the package) magnetic field at the same time and outputs the pulse (F) and rotational direction (D).
AK8776 is for use in portable devices which uses rotational detection system or incremental pulse encoder such as
jog dial utilized for input devices.
Features
o
o
o
o
o
1.6 to 5.5V operation
Bop, Brp(Vertical, Horizontal) ±1.5mT(Typ.), Highly sensitive
Low power operation : Average 90μA(Typ.) @VDD=3V
Two Output: F-Output (Pulse count), D-Output (Direction of rotation)
Small package: SOP-4pin, Halogen free
MS1317-E-00
2011/July
1
[AK8776]
Block Diagram
VDD
VSS
BIAS
OSC
HE_DRIVE
TIMING LOGIC
HALL SENSORS
F
CHOP_AMP
COMP
D
Figure 1. Block diagram
Circuit Configuration
Table 1. Circuit configuration
Block
Function
HALL SENSORS
CHOPPER_SW
Two Hall elements fabricated by CMOS process.
Perform chopping in order to cancel the offset of Hall sensor.
Amplifies two Hall sensor output voltage with summation and subtraction
circuit.
CHOP_AMP
COMP
BIAS
Hysteresis comparator.
Generates bias current to other circuits.
Generates bias current for Hall sensors.
Generates operating clock.
HE_DRIVE
OSC
TIMING LOGIC
LATCH & LOGIC
Generates timing signal required for Chopper SW, AMP and COMP.
Logical circuits and CMOS output buffer.
MS1317-E-00
2011/July
2
[AK8776]
Pin/Function
Table 2. Description of pin name and function
Pin No.
Pin name
I/O
-
O
O
-
Function
Power supply pin
Output F (Pulse) pin
Output D (Direction) pin
Ground pin
Note
1
2
3
4
VDD
F
D
CMOS output
CMOS output
VSS
Absolute Maximum Ratings
Table 3. Absolute maximum ratings
Parameter
Power supply voltage
Output current
Symbol
VDD
IOUT
Min.
- 0.3
- 0.5
- 40
Max.
+6.5
+0.5
+125
Unit
V
mA
°C
Note
F,D pin
Storage temperature
TSTG
Note) Stress beyond these listed values may cause permanent damage to the device.
Recommended Operating Conditions
Table 4. Recommended operating conditions
Parameter
Power supply voltage
Operating temperature
Symbol
VDD
Min.
1.6
- 30
Typ.
3.0
Max.
5.5
+85
Unit
V
°C
Ta
Electrical Characteristics
Table 5. Electrical characteristics (Ta=25°C, VDD = 3.0V)
Parameter
Symbol
IDD
VOH
VOL
TPD1
TPD2
Min.
Typ.
90
Max.
210
Unit
mA
V
V
ms
Note
Average
F,D pin, IOUT= - 0.5mA
F,D pin, IOUT= +0.5mA
Current consumption
High level output Voltage
Low level output Voltage
Pulse drive period
VDD-0.4
0.4
2.0
48.8
0.5
12.2
1.0
24.4
Pulse drive duration time
ms
Note) Internal data is determined just before the internal circuit turns off. And after 6.1μs (Typ.), the output
changes.
MS1317-E-00
2011/July
3
[AK8776]
Magnetic Characteristics
The output F and D is processed signals from internal signal A and B which is determined by the applied magnetic
field and threshold level BopV, BrpV, BopH and BrpH as follows.
Table 6. Magnetic characteristics(Ta = 25°C, VDD = 3.0V)
Parameter
Vertical magnetic field
operating point
Symbol
Min.
Typ.
Max.
Unit
Note
BopV
1.5
4.0
mT
(*1)
Vertical magnetic field
releasing point
Horizontal magnetic field
operating point
BrpV
BopH
mT
mT
(*1)
(*2)
- 4.0
- 1.5
1.5
4.0
Horizontal magnetic field
releasing point
BrpH
mT
mT
(*2)
- 4.0
- 1.5
Hysteresis
BhV, BhH
3.0
(*1), (*2)
(*1) Horizontal magnetic flux density is zero.
(*2) Vertical magnetic flux density is zero.
MS1317-E-00
2011/July
4
[AK8776]
Operational Characteristics
AK8776 detects the “vertical” (perpendicular to the marking side of the package) magnetic field, and the resulting
internal signal A changes state. When the magnetic field is more positive than BopV, the internal signal A changes to
‘Low’ state. And it is kept while the magnetic field remains more positive than BrpV. When the magnetic field drops
below BrpV, the internal signal A changes to ‘High’ state. Those threshold magnetic flux density levels are defined
in Table 6.
S
Internal signal A
BhV
Top(Marking)
BopV
BrpV
Bottom
0
N
N [ｍT]
S [ｍT]
Figure 2. Switching behavior of internal signal A when vertical
magnetic field is applied
AK8776 detects “horizontal “(parallel to the marking side of the package) magnetic field, and the resulting internal
signal B changes state. When the magnetic field is more positive than BopH, the internal signal B changes to ‘Low’
state. And it is kept while the magnetic field remains more positive than BrpH. When the magnetic field drops below
BrpH, the internal signal B changes to ‘High’ state. Those threshold magnetic flux density levels are defined in
Table 6.
Internal signal B
BhH
Line Marking
Top(Marking)
VSS pin
S
BopH
BrpH
N
0
N [ｍT]
S [ｍT]
D pin
Bottom
Figure 3. Switching behavior of internal signal B
when horizontal magnetic field is applied
MS1317-E-00
2011/July
5
[AK8776]
Behaviors of internal signal A,B and output signal F, D when a rotating magnetic field is applied on AK8776
F signal (pulse) is correspond to the result of internal signal A and B. And D signal (direction) is given by looking up
the state of signal A and B.
Direction changed
Direction changed
BopV
BrpV
＊
Vertical M.F.D.
t
t
BopH
BrpH
Horizontal M.F.D.
Supply voltage VDD
t
t
Internal signal A
(Vertical)
Internal signal B
(Horizontal)
t
t
t
F (Pulse)
D (Direction)
Undefined (High or Low)
F,D signal is determined.
Figure 4. Behaviors of internal signal A,B and output signal F, D
when a rotating magnetic field is applied on AK8776
*M.F.D. is Magnetic Flux Density.
Note) D signal is determined after one pulse sent out of F signal. The section which the output status is undefined
appears only in the starting up of this device.
MS1317-E-00
2011/July
6
[AK8776]
Functional Timing
Current consumption
IDD ON (Typ. 3.5mA)
TPD2 (Typ. 24.4μs)
TPD1 (Typ. 1.0ms)
t
t
Vertical M.F.D.
BopV
BrpV
Horizontal M.F.D.
BopH
t
t
BrpH
Internal signal A
(Vertical)
Internal signal B
(Horizontal)
t
6.1μs(Typ.)
6.1μs(Typ.)
6.1μs(Typ.)
6.1μs(Typ.)
F (Pulse)
t
Figure 5. The timing chart of current consumption and transition timing of
internal and output signal
Note)VDD=3.0V. Output signal F and D are changed at the same time.
MS1317-E-00
2011/July
7
[AK8776]
Typical Characteristic Data (for reference)
4
3
4
BopV
3
BopH
BrpH
BrpV
2
2
1
1
0
0
-1
-2
-3
-4
-1
-2
-3
-4
-30 -20 -10
-30 -20 -10
-30 -20 -10
0
10 20 30 40 50 60 70 80 90
-30 -20 -10
-30 -20 -10
-30 -20 -10
0
10 20 30 40 50 60 70 80 90
Ambient temperature Ta [℃]
Ambient temperature Ta [℃]
BopV, BrpV vs. Ta (VDD=1.6V)
BopH, BrpH vs. Ta (VDD=1.6V)
4
3
4
3
BopV
BrpV
BopH
BrpH
2
2
1
1
0
0
-1
-2
-3
-4
-1
-2
-3
-4
0
10 20 30 40 50 60 70 80 90
0
10 20 30 40 50 60 70 80 90
Ambient temperature Ta [℃]
Ambient temperature Ta [℃]
BopV, BrpV vs. Ta (VDD=3.0V)
BopH, BrpH vs. Ta (VDD=3.0V)
4
3
4
3
BopV
BrpV
BopH
BrpH
2
2
1
1
0
0
-1
-2
-3
-4
-1
-2
-3
-4
0
10 20 30 40 50 60 70 80 90
0
10 20 30 40 50 60 70 80 90
Ambient temperature Ta [℃]
Ambient temperature Ta [℃]
BopV, BrpV vs. Ta (VDD=5.5V)
BopH, BrpH vs. Ta (VDD=5.5V)
Figure 6. Temperature dependence of sensitivity
160
140
120
100
80
160
140
-30℃
0℃
25℃
120
5.5V
85℃
100
80
60
40
20
0
3.0V
1.6V
60
40
20
0
-30 -20 -10
0
10 20 30 40 50 60 70 80 90
1
2
3
4
5
6
VDD [V]
IDD vs. VDD (in various Ta)
Ambient temperature Ta [℃]
IDD vs. Ta (in various VDD)
Figure 7. Temperature dependence of current consumption
MS1317-E-00
2011/July
8
[AK8776]
Unit in mm
Package
４
１
３
Sensor Center
２
Marking
1:VDD
2:F
3:D
4:VSS
Figure 8. Package dimensions
Note 1) The center of the sensor is located within the f 0.3mm circle.
Note 2) The tolerances of dimensions with no mentions are ±0.1mm.
Note 3) Coplanarity: The differences between standoff of terminals are max. 0.1mm.
Note 4) The sensor part is located 0.4mm±0.1mm far from marking surface.
Material of terminals： Cu alloy
Material of plating for terminals： Sn 100％
Thickness of plating for terminals：10μm (Typ.)
MS1317-E-00
2011/July
9
[AK8776]
Marking
Marking is performed by laser
4
1
3
Product name ：J (AK8776)
Date code
：YML
Y：Last one digit of manufactured year（0∼ 9）
M：Manufactured month
JYML
Jan.
Feb.
Mar.
Apr.
May.
Jun.
C
D
E
F
Jul.
Aug.
Sept.
Oct.
Nov.
Dec.
J
K
L
2
Line Marking
M
N
P
G
H
Figure 9. Marking
L：Lot(1∼ 9,A∼ Z)
Recommended External Circuit
GND
Output (D signal)
4
1
3
2
0.1μF
Top View
Output (F signal)
VDD
Figure 10. Recommended external circuit
MS1317-E-00
2011/July
10
[AK8776]
IMPORTANT NOTICE
l These products and their specifications are subject to change without notice.
When you consider any use or application of these products, please make inquiries the sales office of
Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the
products.
l Descriptions of external circuits, application circuits, software and other related information
contained in this document are provided only to illustrate the operation and application examples of
the semiconductor products. You are fully responsible for the incorporation of these external circuits,
application circuits, software and other related information in the design of your equipments. AKM
assumes no responsibility for any losses incurred by you or third parties arising from the use of these
information herein. AKM assumes no liability for infringement of any patent, intellectual property, or
other rights in the application or use of such information contained herein.
l Any export of these products, or devices or systems containing them, may require an export license or
other official approval under the law and regulations of the country of export pertaining to customs
and tariffs, currency exchange, or strategic materials.
l AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety,
life support, or other hazard related device or systemNote2), and AKM assumes no responsibility for
such use, except for the use approved with the express written consent by Representative Director of
AKM. As used here:
Note1) A critical component is one whose failure to function or perform may reasonably be
expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the
device or system containing it, and which must therefore meet very high standards of
performance and reliability.
Note2) A hazard related device or system is one designed or intended for life support or
maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in
which its failure to function or perform may reasonably be expected to result in loss of life or in
significant injury or damage to person or property.
l It is the responsibility of the buyer or distributor of AKM products, who distributes, disposes of, or
otherwise places the product with a third party, to notify such third party in advance of the above
content and conditions, and the buyer or distributor agrees to assume any and all responsibility and
liability for and hold AKM harmless from any and all claims arising from the use of said product in
the absence of such notification.
MS1317-E-00
2011/July
11
©2020 ICPDF网 联系我们和版权申明