EM3242

[EM3242]
EM3242
Angle Sensor IC
Applications
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Small absolute rotary encoder
Small input device (mode selector, volume control, and soon)
Potentiometer
Rotary switch
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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%VDD~90%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
VDD
VSS
HE
X
Angle detection
HE
Preamp
10bit
DAC
(Mixed signal
AOUT
processing circuit)
HE
Buffer
Y
HE
Sine wave
ROM
TSTA
<EM3242
PDN
TSTB
Datasheet V1.2>
-1-
April, 2013
[EM3242]
Functional Blocks
Block name
Function
Hall Elements. These detect X/Y-compositions of flux which is parallel to the IC
package surface by using magnetic concentrator.
This is able to amplify signals from Hall elements.
HE
PreAmp
Angle Detection
&
Sine Wave ROM
DAC
Angle Detection makes digital angle data from signals from Hall Elements using Sine
Wave ROM.
Digital to analog converter for angle output.
PIN Description
No.
Symbol
I/O
Type
1
TSTB
I/O
Analog/Digital
2
VSS
-
Power
3
PDN
I
Analog
4
AOUT
O
Analog
5
VDD
-
Power
6
TSTA
I/O
Analog
Function
TEST dedicated PIN, which should be connected to the GND in
use.
Ground PIN.
Power down PIN. IC is active in the case that PDN is High. IC is
power down in the case that PDN is Low.
Analog output PIN for angle data. CL: max.200pF(pull-down)
Power Supply PIN. 0.1uF Ceramic Capacitor is required between
Vss for stabilization. If Capacitor has magnetism, separate it
around 10mm from IC.
TEST dedicated PIN, which should be connected to the GND in
use.
Application Circuit
Power Down Input
Analog Voltage Output
4:AOUT PDN:3
Power Supply
Analog Voltage Output
VDD(2.7V-3.3V)
5:VDD
VSS:2
0.1F
6:TSTA TSTB:1
Locate close to IC
*Bypass capacitor must be inserted between VDD and VSS.
<EM3242
Datasheet V1.2>
-2-
April, 2013
[EM3242]
Absolute Maximum Ratings
Parameter
Symbol
Supply Voltage
Input Voltage
VDD
VIN
Min.
-0.3
-
Max.
6.5
VDD+0.3
Unit
V
V
Storage Temperature
Range
Tstg
-50
+125
C
備考
PDN terminal
Operating Conditions
Parameter
Symbol
Supply Voltage
Vdd
Min.
2.7
Typ.
3.0
Max.
3.3
Unit
V
Operating
Temperature Range
Ta
-30
-
+85
C
Notes
Electrical & Magnetic Specifications
Condition is; Ta=25C, VDD=3.3V if particular notes are not defined.
Parameter
Symbol
Min.
Typ.
Max.
Magnetic Flux
BRANGE
20
30
40
Density Range
Angle Detection
Range
Angle Resolution
Angle error
Linearity
ARANGE
ARES
APREC
INL
mT
360
Deg.
3.0
0.84
Deg.
Deg.
%FS
0.36
-3.0
-0.84
Unit
@-30~85C *2
10Bit
@25C *5 *8
FS=360° *5
@-30~85C
(Reference)*1*6
Angle temperature drift
ATD
+/-1.0
Angle output cycle
Signal delay time
Tp
Td
40
140
180
μs
μs
Minimum Output
Voltage
VOUT(min)
0.095VDD
0.1VDD
0.105VDD
V
Maximum Output
Voltage
VOUT(max)
0.895VDD
0.9VDD
0.905VDD
V
8
12
mA
PDN:H *7
1
μA
PDN:L *7
850
0.3
μs
mA
PDN:L→H *2
*2
Consumption Current
While driving Sensor
Consumption Current
While Power Down
Startup time
Output Current
ISUP
IPD
TPD
IOUT
680
-0.3
Deg.
Notes
A/D Conversion Cycle *2
*2
@Angle 0°
Ratiometric
Load Condition *3
@Angle 359.64°
Ratiometric
Load Condition *4
*1) Based on Ambient Temperature = 25C
*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),
CL=200pF (pull-down)
<EM3242
Datasheet V1.2>
-3-
April, 2013
[EM3242]
*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.]
Vout (max.)
Output Voltage
Base Line
Maximum Perpendicular Deviation
Vout (min.)
0°
360°
Rotation Angle
*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))
Vout (max.)
Output Voltage
Ta=T1
Ta=25C
Vout temperature drift
Base Line
Vout (min.)
Base Line
0°
360°
Rotation Angle
*7) No Load
<EM3242
Datasheet V1.2>
-4-
April, 2013
[EM3242]
*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)
8
N=36pcs
<Angle Error>
Ave.=0.87°
σ=0.22°
7
N [pcs]
6
5
4
3
2
1
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Angle Error [° ]
In this measurement conditions, Maximum of Angle Error (Ave.+5σ) is smaller than +/-2
Startup time
Power Supply
PDN
AOUT
Unstable
Angle Voltage
MAX 850 s
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.
<EM3242
Datasheet V1.2>
-5-
April, 2013
[EM3242]
Magnet Direction and Output Voltage
0°
S
S
N
N
90°
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.
Output Voltage
VDD
0.9VDD
0.5VDD
0.1VDD
Error signal
0°
180°
360°
B<10mT or B>60mT
Rotation Angle
<EM3242
Datasheet V1.2>
-6-
Error output level 0 to 0.2V
April, 2013
[EM3242]
Package and Terminals
マーキング
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
Datasheet V1.2>
-7-
April, 2013
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