iC-MU

MagnetiC off-axis absolUte position enCoder

Am Kuemmerling 18 • D-55294 Bodenheim, Germany

Tel. +49 61 35/92 92-300 • Fax +49 61 35/92 92-19 2 • http://www.ichaus.com

Rev. 1.0

Besides 2-track nonius computation iC-MU is capable of extend-

ing the rotary or linear absolute position using 3-track nonius

computation. A second iC-MU can be connected up and evalu-

ated using the multiturn interface. In doing so, the length of the

absolute position measurement can be extended.

Besides its automatic signal conditioning functions iC-MU fea-

tures manual compensation of the sine/cosine signal offsets and

phase errors for both channels, allowing it to cope with magnet

errors and encoder assembly inaccuracies.

Upon cycling power iC-MU loads its CRC-protected setup

from the external EEPROM connected up to the I²C interface.

Alternatively, using the SPI interface the device can be config-

ured and operated by an external microcontroller.

This preliminary information is not tantamount to a guarantee of device characteristics. All rights to technical changes reserved

pin Configuration dfn16 5x5 mm²

yyww...

...

MU

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

pin functions

no.

name

function

1

SCL

EEPROM I²C Interface, clock line

2

SDA

EEPROM I²C Interface, data line

3

VPA

+4.5 V to +5.5 V Analog Supply Voltage

4

VNA

Analog Ground

5

PB0

Port B, Pin 0:

Digital I/O, analog output configurable

6

PB1

Port B, Pin 1:

Digital I/O, analog output configurable

7

PB2

Port B, Pin 2:

Digital I/O, analog output configurable

8

PB3

Port B, Pin 3:

Digital I/O, analog output configurable

9

PA3

Port A, Pin 3:

Digital I/O, configurable

10

PA2

Port A, Pin 2:

Digital I/O, configurable

11

PA1

Port A, Pin 1:

Digital I/O, configurable

12

PA0

Port A, Pin 0:

Digital I/O, configurable

13

VND

Digital ground

14

VPD

+4.5 V to +5.5 V Digital Supply Voltage

15

MTD

Multiturn Interface, data line

16

MTC

Multiturn Interface, clock line

TP

Thermal Pad

Key specifications

general

Supply Voltage

+4.5 V to +5.5 V

Supply Current

50 mA max.

Max. Operating Frequency

6.4 kHz

Max. Operating Speed

linear speed to 16 m/s,

rotational speed to 24,000 RPM @ 16

pole pairs, to 12,000 RPM @ 32 pole

pairs, to 6,000 RPM @ 64 pole pairs

Magnetic Field Strength

15 to 100 kA/m

ESD Susceptibility

2 kV (HBM 100 pF, 1.5 k

Ω)

Operational Temperature

-40°C to +95°C

Package (RoHS compliant)

16-pin DFN (5 mm x 5 mm)

sine-to-digital Conversion

Conversion Resolution

up to 12 bits per signal period

(14 bits filtered)

Conversion Accuracy

2 LSB @ 12 bit

Analog Cutoff Frequency

20 kHz (-3 dB)

position resolution

Nonius of 16/15 *

18 bits (filtered), 5 arcsec / 0.156 µm

Nonius of 32/31 *

19 bits (filtered), 2.5 arcsec / 0.156 µm

Nonius of 64/63 *

20 bits (filtered), 1.25 arcsec / 0.156 µm

* No. of signal periods

(18 bits max. for A/B outputs)

absolute linear Measurement distance

Nonius of 32/31

up to 81.9 mm

(signal phase tolerance +/- 40 µm max.)

Nonius of 64/63

up to 163.8 mm

(signal phase tolerance +/- 20 µm max.)

Nonius of 1024/1023/992

up to 2.62 m (two iC-MU cascaded and

operated at 32/31)

output ports

Characteristics

CMOS/TTL compatible, ±4 mA @ 5 V

PAx Port Modes

SPI, SSI, BiSS C, A/B/Z

PBx Port Modes

A/B/Z, U/V/W, STEP/DIR, CW/CCW,

Sin/Cos 250 mVpk

Incremental Signals

A/B to 5 MHz, Z index (adjustable gating)

FlexCount® resolution for 1 to 65536 CPR

Commutation Signals

U/V/W for 1 to 16 pole pairs,

phase shift 60° or 120°

data interfaces

SPI

4-wire, 10 MHz, for position data and config.

BiSS C

up to 38 data bits, error bits, CRC protection,

bidirectional, 10 MHz

SSI

up to 38 bits, error bits, unidirectional, 4 MHz

Multiturn

12 bit SSI, 200 kHz

Magnetic targets (pole wheels)

MU1S 19-16

16/15 pole pairs, OD

Ø 19 mm, bore hole 10M6

MU2S 30-32

32/31 pole pairs, OD

Ø 30 mm, bore hole 10M6

MU3S 56-64

64/63 pole pairs, OD

Ø 56 mm, bore hole 10M6