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EM3242 Datasheet

AKM Semiconductor Inc.

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Datasheet

[EM3242]
<EM3242 Datasheet V1.2> 1 April, 2013
Applications
Small absolute rotary encoder
Small input device (mode selector, volume control, and soon)
Potentiometer
Rotary switch
Features
Si monolithic rotary position sensor IC with embedded Hall devices
Contactless rotary position sensor is easily implemented with magnetic disc (radial magnetic) and sensor IC.
Analog ratiometric output (10%VDD90%VDD)
10 bit Angular Resolution
3V single power supply
Extremely small temperature drift (typ. +/-1.0 degree)
Ambient operating temperature range: Ta=-40 to 150ºC
Package: SOP6 body size 3.6×3.0×0.95mm
Block Diagram
HE
X
HE
HE
Y
HE
Angle detection
(Mixed signal
processing circuit)
Preamp
Sine wave
ROM
DAC
10bit
PDN
TSTB
TSTA
VSS
VDD
AOUT
Angle Sensor IC
EM3242
[EM3242]
<EM3242 Datasheet V1.2> 2 April, 2013
4:AOUT
5:VDD
6:TSTA
PDN:3
VSS:2
TSTB:1
0.1F
Analog Voltage Output
Analog Voltage Output
Power Down Input
Power Supply
VDD(2.7V-3.3V)
Locate close to IC
Functional Blocks
Block name
Function
HE
Hall Elements. These detect X/Y-compositions of flux which is parallel to the IC
package surface by using magnetic concentrator.
PreAmp
This is able to amplify signals from Hall elements.
Angle Detection
&
Sine Wave ROM
Angle Detection makes digital angle data from signals from Hall Elements using Sine
Wave ROM.
DAC
Digital to analog converter for angle output.
PIN Description
No.
Symbol
I/O
Type
Function
1
TSTB
I/O
Analog/Digital
TEST dedicated PIN, which should be connected to the GND in
use.
2
VSS
-
Power
Ground PIN.
3
PDN
I
Analog
Power down PIN. IC is active in the case that PDN is High. IC is
power down in the case that PDN is Low.
4
AOUT
O
Analog
Analog output PIN for angle data. CL: max.200pFpull-down
5
VDD
-
Power
Power Supply PIN. 0.1uF Ceramic Capacitor is required between
Vss for stabilization. If Capacitor has magnetism, separate it
around 10mm from IC.
6
TSTA
I/O
Analog
TEST dedicated PIN, which should be connected to the GND in
use.
Application Circuit
*Bypass capacitor must be inserted between VDD and VSS.
[EM3242]
<EM3242 Datasheet V1.2> 3 April, 2013
Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Unit
備考
Supply Voltage
VDD
-0.3
6.5
V
Input Voltage
VIN
-
VDD+0.3
V
PDN terminal
Storage Temperature
Range
Tstg
-50
+125
C
Operating Conditions
Parameter
Symbol
Min.
Typ.
Max.
Unit
Notes
Supply Voltage
Vdd
2.7
3.0
3.3
V
Operating
Temperature Range
Ta
-30
-
+85
C
Electrical & Magnetic Specifications
Condition is; Ta=25C, VDD=3.3V if particular notes are not defined.
Parameter
Symbol
Min.
Typ.
Max.
Unit
Notes
Magnetic Flux
Density Range
BRANGE
20
30
40
mT
@-3085C *2
Angle Detection
Range
ARANGE
360
Deg.
Angle Resolution
ARES
0.36
Deg.
10Bit
Angle error
APREC
-3.0
3.0
Deg.
@25C *5 *8
Linearity
INL
-0.84
0.84
%FS
FS=360° *5
Angle temperature drift
ATD
+/-1.0
Deg.
@-3085C
(Reference)*1*6
Angle output cycle
Tp
40
μs
A/D Conversion Cycle *2
Signal delay time
Td
140
180
μs
*2
Minimum Output
Voltage
VOUT(min)
0.095VDD
0.1VDD
0.105VDD
V
@Angle 0°
Ratiometric
Load Condition *3
Maximum Output
Voltage
VOUT(max)
0.895VDD
0.9VDD
0.905VDD
V
@Angle 359.64°
Ratiometric
Load Condition *4
Consumption Current
While driving Sensor
ISUP
8
12
mA
PDNH *7
Consumption Current
While Power Down
IPD
1
μA
PDNL *7
Startup time
TPD
680
850
μs
PDNL→H *2
Output Current
IOUT
-0.3
0.3
mA
*2
*1) Based on Ambient Temperature = 25C
*2) This is a design assurance parameter. And this parameter will not be inspected in mass production.
*3) AOUT Maximum Load Condition is CL=200pF (pull-down), AOUT Load Condition in Vout (min.) test: RL=9kΩ (pull-up), CL
200pF (pull-down)
*4) AOUT Maximum Load Condition is CL=200pF (pull-down), AOUT Load Condition in Vout (max.) test: RL=9kΩ (pull-down),
CL200pF (pull-down)
[EM3242]
<EM3242 Datasheet V1.2> 4 April, 2013
*5) Angle error
Angle Error is defined as below formula.
Angle Error [°]360°×Maximum Perpendicular Deviation/( Vout (max)- Vout (min))
Linearity is defined as below formula.
Linearity [%FS.]Maximum Perpendicular Deviation /( Vout (max)- Vout (min)) ×100 [%FS.]
*
*6
6)
)
Angle temperature drift
Vout temperature drift means temperature drift of output voltage at the same rotation angle.
Angle temperature drift is defined as below formula.
Angle temperature drift [°]360°×Vout temperature drift/( Vout (max)- Vout (min))
*7) No Load
360°
Base Line
Base Line
Vout temperature drift
Ta=25C
Ta=T1
360°
Rotation Angle
Maximum Perpendicular Deviation
Base Line
Vout (max.)
Vout (min.)
Output Voltage
Rotation Angle
Vout (max.)
Vout (min.)
Output Voltage
[EM3242]
<EM3242 Datasheet V1.2> 5 April, 2013
*8) Reference (Angle Error)
<Measurement conditions>
1. Magnet: φ7.0×t2.0mm (Neodymium magnet: Br=1250mT)
2. Distance between the magnet and the package: Gap=4.0mm
(This Gap is the distance where the magnetic flux density at the sensor becomes 30mT)
3. Rotation angle of magnet: 0 to 360° (step: 1deg.)
4. Power Supply: Vdd=3.3V
5. Bypass Capacitor: C=0.1μF Distance from IC to Bypass Capacitor: d=15mm
0
1
2
3
4
5
6
7
8
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Angle Error [° ]
N  [pcs]
N=36pcs
<Angle Error>
Ave.=0.87°
σ=0.22°
In this measurement conditions, Maximum of Angle Error (Ave.+5σ) is smaller than +/-2
Startup time
1) Please be noted that there is a certain period that the angle output voltage is unstable when EM-3242 goes to the
operation from power down (PDN) mode, as shown above.
2) “Power Up Voltage” should be applied to PDN pin after applying “Power Supply Voltage” to VDD pin.
MAX 850s
Power Supply
PDN
AOUT Unstable Angle Voltage
MAX 850s
Power Supply
PDN
AOUT Unstable Angle Voltage
[EM3242]
<EM3242 Datasheet V1.2> 6 April, 2013
Magnet Direction and Output Voltage
Marking side defines the N polar as 0°, the Output Voltage (AOUT) increases as the magnet rotates
counterclockwise. In other words, it decreases as the magnet rotates clockwise.
0.1VDD
B<10mT or B>60mT
Error output level 0 to 0.2V
Error signal
Output Voltage
Rotation Angle
180°
360°
0.9VDD
0.5VDD
VDD
0°
90°
N
SN
S
0°
90°
N
S
N
SN
SN
S
[EM3242]
<EM3242 Datasheet V1.2> 7 April, 2013
Package and Terminals
Material of the terminals; Cu
Material of the plating; Sn
Thickness of the plating; 10μm (Typ.)
Weight 24.3mg
*This product is a Pb-Free Product.
[EM3242]
8
ASAHI KASEI MICRODEVICES CORPORATION
Head Office
1-105 Kanda Jimbocho, Chiyoda-ku, Tokyo 101-8101, Japan
Tel: +81-3-3296-3967 Fax: +81-3-3296-3942
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