IC-TW8_13 Datasheet, PDF (39/63 Pages) IC-Haus GmbH – 16-BIT SIN/COS INTERPOLATOR WITH AUTO-CALIBRATION

iC-TW8 16-BIT SIN/COS INTERPOLATOR
Serial Configuration Mode
preliminary
Jan 9, 2013 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 EEPROM con-
nects directly to the iC-TW8 via a dedicated I²C
communication channel using SCL (pin 27) and
SDA (pin 28) as shown in Figure 10. No external
pull-up resistors are required. EESEL (pin 4) of
the TW8 must also be connected to DVSS as
shown.
DVDD
EESEL
DVSS
VDD
EESEL tied to DVSS.
1µF
VDD
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+
SCL
SDA
WP
iC-TW8
SCL VCC
SDA _VSS
WP
EEPROM
24xx
1µF
COS-
iC-TW8
Figure 11: Differential Sensor Connection
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.
SIN+
A
0 (VDD/2)
5mV ≤ A ≤ 350mV
–A
0°
SIN-
180°
360°
Figure 12: Differential Sensor Signal Inputs
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