iC-TW8 16-BIT SIN/COS INTERPOLATOR
Serial Configuration Mode
Jan 9, 2013 Page SC4/36
Functional Block Diagram
A functional block diagram of the iC-TW8 is shown
in Figure 2 and explained on the following pages.
Digital
Sensor Distortion
Correction
(Lookup Table)
Offset Correction
Gain Match Correction
Phase Correction
Analog
Gain
Anti-Aliasing
Filter
Digital
Hysteresis
AB/PWM Output
Generator
Analog
Offset
Analog-to-Digital
Filter
(Servo Loop)
Interpolation Factor
Calculation
Correction
Angle Calculation
Converters
SIN+
SIN–
OUTA
OUTB
OUTZ
ADC
PGA
Error
Corr.
Arc-
tan
LUT
Filter
Hyst
Inter
COS+
COS–
ADC
PGA
AB Signal Path
ZERO+
ZERO–
x8
Delay
SPI_xSS
SPI_SCLK
SPI_SI
SPI_SO
IR
Z Comparator
Z Signal Path
Serial
Ports
Auto Calibration
Auto Adaption
Auto Store
CALIB
Internal
Memory
XIN
Clock
Generator
ADC Quality Monitor
Adaption Quality Monitor
XOUT
WP
EEPROM
Interface
SCL
SDA
Fault
Handling
Power-On
Reset
xRST
STATUS FAULT
Figure 2: Block Diagram
port, both of which utilize the same communication
protocol (see Serial Communication Ports in the
Programmer’s Reference). Both ports may be used
simultaneously.
Clock Generator
The Clock Generator uses an external crystal or oth-
er clock source to generate the internal core clock
(fcore) for the iC-TW8. An internal oscillator is also
provided which can be used if an external crystal is
not desired. The internal core clock controls all tim-
ing within the iC-TW8.
EEPROM Interface
A 24xx02 through 24xx16 family I2C EEPROM is
required for storage of sensor calibration data (off-
set, gain, etc.). The EEPROM connects directly to
the iC-TW8 via the dedicated I2C EEPROM inter-
face.
Power-On Reset
The Power-On Reset (POR) circuit provides orderly
startup of the iC-TW8 when power is applied. An
external reset source can also be connected to the
POR to allow independent control of device startup.
Internal Memory
The iC-TW8 provides 32K bytes of internal
memory divided into eight functional blocks that
can be accessed by the user via either of the serial
ports. See Internal Memory in the Programmer’s
Reference for more information.
Serial Ports
The iC-TW8 contains two serial ports that may be
used for communication. These are a standard SPI
(Serial Peripheral Interface) slave port and a 1-wire
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