IC-TW8_16 Datasheet, PDF (43/67 Pages) IC-Haus GmbH – 16-BIT SIN/COS INTERPOLATOR

iC-TW8 16-BIT SIN/COS INTERPOLATOR
Serial Configuration Mode
Aug 16, 2016 Page SC12/36
Connecting the EEPROM
The iC-TW8 requires a 24xx02 through 24xx16
family I²C EEPROM for storage of sensor calibra-
tion data (offset, gain, etc.). The selected
EEPROM must operate down to 1.8V; the Micro-
chip 24A02 is recommended.
The EEPROM connects directly to the iC-TW8
via a dedicated I²C communication channel using
SCL (pin 27) and SDA (pin 28) as shown in Fig-
ure 10. No external pull-up resistors are required.
EESEL (pin 4) of the TW8 must also be connect-
ed to DVSS as shown.
DVDD
EESEL
VDD
EESEL tied to DVSS.
1µF
Connecting the Incremental Sensor
The iC-TW8 connects directly to magnetic (such as
the iC-SM2L or iC-SM5L) or optical sensors provid-
ing differential Sin/Cos outputs as shown in Figure 11.
Signal amplitude (A) from all four sensor channels
must be in the range of 5 – 350mV as shown in Figure
12 for proper operation with the iC-TW8.
AVDD
Sensor Bridge 0
Sensor Bridge 1
SIN+
SIN-
COS+
DVSS
SCL
SDA
WP
iC-TW8
SCL VCC
SDA
VSS
WP
EEPROM
24xx
VDD
1µF
COS-
iC-TW8
Figure 11: Differential Sensor Connection
SIN+
A
Figure 10: EEPROM Connection
In serial configuration mode, the Write Protect
(WP) input of the EEPROM is controlled by the
iC-TW8. WP must be disabled via the serial port
during calibration to allow the iC-TW8 to write
parameter values to the EEPROM. In operation,
WP can be left enabled or disabled as required by
the application.
0 (VDD/2)
5mV ≤ A ≤ 350mV
–A
0°
SIN-
180°
360°
Figure 12: Differential Sensor Signal Inputs
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