IC-TW8 Datasheet, PDF (2/2 Pages) IC-Haus GmbH – 16-BIT SIN/COS INTERPOLATOR WITH AUTO-CALIBRATION

iC-TW8
16-BIT SIN/COS INTERPOLATOR WITH AUTO-CALIBRATION
Novel push-button calibration
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.
Pin Functions QFN48 7x7 mm²
Function Pin
I/O
Description
xRST
2
in
Reset Input
FAB
3
in
Test Enable Input
EESEL
4
in
External EEPROM Selection Input
CALIB
5
in
Calibration Control
CLOCK/GP1 6
in/out Clock Output / General Purpose I/O
IR
7
in/out 1-Wire Interface I/O
FRAME/GP0 8
in/out Sync Output / General Purpose I/O
SPI_SO
9
out
SPI Slave Output
SPI_SI
10
in
SPI Slave Input
SPI_SCLK 11
in
SPI Slave Clock Input
SPI_xSS
14
in
SPI Slave Select Input
DVSS
15
ground Digital Ground
OUTZ
16
out
Z Output
OUTB
17
out
B Output / PWM- Outp. / Z Window
OUTA
18
out
A Output / PWM+ Outp. / Z Window
STATUS
19
out
PWM Status Output
ERR
20
out
Error Status Output
DVDD
21
power +3.1 V to +5.5 V Dig. Power Supply
PINSEL
22
in
Configuration Mode Selection
MI
26
in
SPI EEPROM Master Input
SCL/SCLK 27
in/out I2C / SPI Clock Line
SDA/MO
28
in/out I2C / SPI Data Line
WP/xCS
29
out
I2C Write Prot. / SPI Slave Selection
Cx/GPx
30...33 a/d
Static Config. Input / GPIO
XOUT
34
a
Crystal Terminal
XIN
35
a
Crystal Terminal
AVDD
38
power +3.1 V to +5.5 V Analog Pwr. Supply
SIN+
39
a
Sine Input +
SIN-
40
a
Sine Input -
COS+
41
a
Cosine Input +
COS-
42
a
Cosine Input -
AVSS
43
ground Analog Ground
VC
44
a
Bias Output
VREF
45
a
Bias Output
AVSS
45
ground Analog Ground
ZERO+
46
a
Zero Input +
ZERO-
47
a
Zero Input -
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
Key Specifications
Inputs and Analog Signal Conditioning
Max. Input Frequency
125 kHz
Diff. Input Signal Range
20 mVpp to 1.4 Vpp (differential)
Sin/Cos Input Signal Range
Analog Gain Range
Analog Offset Compensation
Zero Inputs Signal Range
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
Digital Sin/Cos Signal Conditioning
Offset Correction
+/- 125 mV, step 244 µV (auto. tracking)
Offset Correction Range
+/- 9 % of amplitude
Differential Gain Correction
Amplit. Mismatch Corr. Range
Digital Phase Correction
x0.8 to x1.25, step x0.002 (auto. track.)
+/- 25 % of amplitude
+/- 26°, step 0.025° (auto. tracking)
Sine-to-Digital Conversion
Sampling Rate
ATAN Calculation
Integral Nonlinearity
Differential Nonlinearity
Distortion Compensation
Dist. Compensation Range
max 250 kHz at 5 V (187 kHz at 3.3 V)
14 bit raw, 16 bit filtered
0.08°
0.02°
64 arbitrary positions by look-up-table
+/- 11°
Incremental Outputs
Fractional Interpolation Factor [8 ... 65536] / [1 ... 32]
Output Signals
A/B quadrature, programmable index Z
Output Characteristics
TTL/CMOS compatible, +/- 4 mA
Max. Output Frequency
Min. Transition Distance
Input-To-Output Latency
Input-To-Output Lag
Other Features
programmable 62 kHz to 8 MHz
progr. 4 µs to 31.25 ns @ fclk 32 MHz
24 µs
4 µs with position lag retrieval
servo loop for superb AB jitter
Absolute Position Data
Angle Position
Angle Velocity
32 bit (with 16 bit for counted periods)
14 bit (up to ±45 M°/s, 5.4 k°/s resol.)
Interface and Configuration
Configuration Storage
external I2C 24xx02 EEPROM
SPI
standard SPI, SCLK up to 32 MHz
1-Wire
PWM interface for in-field wireless
configuration (e.g. using IR)
Static 4-Pin Configuration
by 8 resistors, no programming
Offset/Gain/Phase Calibration push-button automatic with storage of
parameters in external EEPROM
Other Operational Data
Supply Voltage
Operational Temperature
System Clock
Monitoring Functions
3.1 V to 5.5 V, approx. 15 mA (@ 3.3 V)
-40 °C to +125 °C
On-chip RC 16 MHz to 32 MHz,
crystal to 32 MHz (24 MHz @ 3.3 V)
missing EEEPROM, checksum, com-
promised input signals, excessive AB
frequency, runaway of compensation
Am Kuemmerling 18 • D-55294 Bodenheim, Germany
Tel. [phone] • Fax [phone] • http://www.ichaus.com
Rev. 1.0