iC-TW8
16-BIT SIN/COS INTERPOLATOR WITH AUTO-CALIBRATION
Novel push-button calibration
Key Specifications
iC-TW8 offers two principle means of setup: easy static pin
configuration and the SPI/1-wire interface. Static pin configu-
ration is provided with simple automatic calibration and ABZ
quadrature output mode. It uses four configuration inputs and is
preselected by input PINSEL.
The self-learning automatic function requires input signals of a
few seconds only and tolerates changes in frequency and cw/
ccw direction. For more advanced setup requirements the SPI
interface or the 1-wire interface can be used to take full control
of the device.
Inputs and Analog Signal Conditioning
Max. Input Frequency
125 kHz
Diff. Input Signal Range
Sin/Cos Input Signal Range
Analog Gain Range
20 mVpp to 1.4 Vpp (differential)
1.4 V to AVDD – 1 V
6 to 45 dB, step 3 dB (auto. tracking)
+/- 3.1 V, step 100 mV (auto. tracking)
0 V to AVDD
Analog Offset Compensation
Zero Inputs Signal Range
Digital Sin/Cos Signal Conditioning
Offset Correction
+/- 125 mV, step 244 μV (auto. tracking)
Offset Correction Range
Differential Gain Correction
+/- 9 % of amplitude
x0.8 to x1.25, step x0.002 (auto. track.)
2
Pin Functions QFN48 7x7 mm
Amplit. Mismatch Corr. Range +/- 25 % of amplitude
Digital Phase Correction
+/- 26°, step 0.025° (auto. tracking)
Function
xRST
Pin
2
I/O
in
Description
Reset Input
Sine-to-Digital Conversion
FAB
3
in
Test Enable Input
Sampling Rate
max 250 kHz at 5 V (187 kHz at 3.3 V)
EESEL
CALIB
CLOCK/GP1
IR
4
in
External EEPROM Selection Input
Calibration Control
ATAN Calculation
14 bit raw, 16 bit filtered
5
in
Integral Nonlinearity
Differential Nonlinearity
Distortion Compensation
Dist. Compensation Range
0.08°
6
in/out
in/out
in/out
out
in
Clock Output / General Purpose I/O
1-Wire Interface I/O
Sync Output / General Purpose I/O
SPI Slave Output
0.02°
7
64 arbitrary positions by look-up-table
+/- 11°
FRAME/GP0
SPI_SO
SPI_SI
SPI_SCLK
SPI_xSS
DVSS
8
9
10
11
14
15
16
17
18
19
20
21
22
26
27
28
29
SPI Slave Input
Incremental Outputs
in
SPI Slave Clock Input
SPI Slave Select Input
Fractional Interpolation Factor [8 ... 65536] / [1 ... 32]
in
Output Signals
A/B quadrature, programmable index Z
ground Digital Ground
Output Characteristics
Max. Output Frequency
Min. Transition Distance
Input-To-Output Latency
Input-To-Output Lag
Other Features
TTL/CMOS compatible, +/- 4 mA
programmable 62 kHz to 8 MHz
progr. 4 μs to 31.25 ns @ fclk 32 MHz
24 μs
OUTZ
out
out
out
out
out
Z Output
OUTB
OUTA
B Output / PWM- Outp. / Z Window
A Output / PWM+ Outp. / Z Window
PWM Status Output
STATUS
ERR
4 μs with position lag retrieval
servo loop for superb AB jitter
Error Status Output
DVDD
PINSEL
MI
power +3.1 V to +5.5 V Dig. Power Supply
in
Configuration Mode Selection
SPI EEPROM Master Input
I2C / SPI Clock Line
Absolute Position Data
in
Angle Position
Angle Velocity
32 bit (with 16 bit for counted periods)
14 bit (up to 45 M°/s, 5.4 k°/s resol.)
SCL/SCLK
SDA/MO
WP/xCS
Cx/GPx
XOUT
in/out
in/out
out
I2C / SPI Data Line
I2C Write Prot. / SPI Slave Selection
Static Config. Input / GPIO
Crystal Terminal
Interface and Configuration
30...33 a/d
Configuration Storage
external I2C 24xx02 EEPROM
34
35
38
39
40
41
42
43
44
45
45
46
47
a
a
SPI
standard SPI, SCLK up to 32 MHz
XIN
Crystal Terminal
1-Wire
PWM interface for in-field wireless
configuration (e.g. using IR)
AVDD
SIN+
power +3.1 V to +5.5 V Analog Pwr. Supply
Static 4-Pin Configuration
by 8 resistors, no programming
a
a
a
a
Sine Input +
Sine Input -
Offset/Gain/Phase Calibration
push-button automatic with storage of
parameters in external EEPROM
SIN-
COS+
Cosine Input +
Cosine Input -
COS-
Other Operational Data
AVSS
ground Analog Ground
Supply Voltage
3.1 V to 5.5 V, approx. 15 mA (@ 3.3 V)
-40 °C to +125 °C
VC
a
a
Bias Output
Bias Output
Operational Temperature
System Clock
VREF
On-chip RC 16 MHz to 32 MHz,
crystal to 32 MHz (24 MHz @ 3.3 V)
AVSS
ground Analog Ground
ZERO+
ZERO-
a
a
Zero Input +
Zero Input -
Monitoring Functions
missing EEEPROM, checksum, com-
promised input signals, excessive AB
frequency, runaway of compensation
NB: a: analog; a/d: analog/digital
This preliminary information is not tantamount to a guarantee of device
characteristics. All rights to technical changes reserved
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
ICHAUS [ IC-HAUS GMBH ]
