iC-TW8 16-BIT SIN/COS INTERPOLATOR
WITH AUTO-CALIBRATION
Rev A2, Page 4/12
PACKAGING INFORMATION
PIN CONFIGURATION QFN48-7x7
(topview)
PIN FUNCTIONS
No. Name Function
38 AVDD +3.1 V to 5.5 V Analog Supply Voltage
AVDD and DVDD can be powered either
mutually or separately but must be the
same voltage.
46 AVSS Analog Ground
AVSS must be connected to DVSS ex-
ternally.
21 DVDD +3.1 V to 5.5 V Digital Supply Voltage
15 DVSS Digital Ground
TP
Connect the backside paddle to a
ground plane which must have AVSS
potential.
... other Refer to the following table for a detailed
description.
PIN FUNCTIONS
No. Name
I/O
Function
Description
1
2
nc
Pin has no connection to die. Connect to DVSS on PCB.
xRST
Digital in,
Reset Input
The device is held in reset as long as xRST is low.
low active,
40 kΩ pull-up
For operation at 5 V, connect 68 kΩ to DVSS (changes the power-on-
reset threshold to approx. 4 V). Refer to section Power-on-Reset and
Startup for more information on reset.
3
4
5
FAB
Digital in,
5 kΩ pull-down
Test Enable Input
Selection Input
Fabrication test is enabled when pin is high during reset. This pin must
be connected to DVSS for normal operation.
EESEL
CALIB
Digital in,
150 kΩ pull-down
Pin must be tied low.
Digital in,
10 kΩ pull-up,
hysteresis
Calibration Control
Device enters calibration mode on falling edge of CALIB. Adaptation
parameters are written to the external eeprom on rising edge of CALIB.
This pin should be left floating or connected to DVDD if not used.
6
CLOCK
Digital in/out,
150 kΩ pull-down
Clock Output
The pin is a programmable clock output that can be used for PWM
synchronization.
A connection to DVSS is advisable when not in use.
7
8
IR
Digital in/out,
150 kΩ pull-up
1-Wire Interface I/O
Sync Output
Pin is bi-directional. Refer to Programmer’s Reference for more details.
FRAME
Digital in/out,
150 kΩ pull-down
This pin outputs the internal ADC sampling clock, which can be used to
synchronize downstream circuits.
A connection to DVSS is advisable when not in use.
9
SPI_SO
Digital out
Digital in
SPI Slave Output
SPI Slave Input
Pin directly connects to an SPI master MI pin.
10 SPI_SI
Pin directly connects to SPI master MO pin.
This pin should be tied to DVSS if the SPI is not used.
ICHAUS [ IC-HAUS GMBH ]
