IC-TW14 Datasheet, PDF (10/33 Pages) IC-Haus GmbH – IC-PMX Companion Chip

iC-TW14
iC-PMX Companion Chip
ELECTRICAL CONNECTIONS
Rev A1, Page 10/33
iC-PMX
5V
VCC
GND
C0
C1
NCS
SCK
MISO
MOSI
SH
RDY
HOP
HON
VWC
CVWC
iC-TW14
5V
5V
100kΩ
3x
100 kΩ
VDD
GND
NCS
SCK
MISO
MOSI
SH
RDY
HOP
HON
VWP
MCL
MDI
MRDY
UART TX
UART RX
NRES
NPRE
5V 5V
2x 100kΩ
Multiturn
Position
Output (SSI)
100 kΩ
5V 5V
Serial
Port
2x 4.7kΩ
Preset
100 kΩ
Figure 3: Typical iC-TW14 Electrical Connections
The iC-TW14 must be connected to an iC-PMX Ener-
gy-Harvesting Multiturn Counter/Encoder and a single-
turn absolute sensor such as the iC-MHM 14-Bit Abso-
lute Angle Hall Encoder for proper operation. Typical
connections are shown in Figure 3.
Other components required by the iC-PMX (Wiegand
module, FRAM, etc.) and the singleturn sensor (EEP-
ROM, etc.) must also be connected to make an oper-
ational system. These additional components are not
shown in Figure 3.
To work properly with the iC-TW14, the iC-PMX must
be configured to use an FRAM (C0 = 0) and operate
in period counter mode (C1 = 0). This is accomplished
by connecting iC-PMX pins C0 and C1 to ground as
shown. C2 and C3 should be connected as required
by the application. See Self-Sustained Operation Mode
Selection in the iC-PMX datasheet for more information
on the configuration inputs.
A small push-button switch can be connected to the
NPRE input as shown to provide a zeroing function for
system calibration. This allows the multiturn position to
be set to zero during encoder installation to synchronize
the encoder with the external system.
To enable the iC-TW14 to measure the Wiegand pulse
voltage without overloading or damaging the ADC, a
resistive voltage divider must be used. Connect this di-
vider as shown between iC-PMX pin VWC and iC-TW14
pin VWP. The resistor values should be chosen such
that the voltage at iC-TW14 pin VWP never exceeds
VDD. If the Wiegand pulse voltage measurement diag-
nostic feature of the iC-TW14 is not required, iC-TW14
pin VWP should be connected directly to GND.
Note also that the series combination of the two resis-
tors loads CVWC which reduces the harvested energy
available to the iC-PMX when external power is not
available. This voltage divider is only required for diag-
nostics and can be removed for series production.
Connect the SSI multiturn position output of the
iC-TW14 to the multiturn interface of the singleturn sen-
sor as required by the sensor. This allows the singleturn
sensor to synchronize itself with the multiturn position
calculated by the iC-TW14 after power-up.
Connect the serial port to a host PC using an
iC-MB3U-I2C adapter for configuration of the iC-TW14
and iC-PMX using the free graphical user interface
(GUI) software.
Pull-up and pull-down resistors are recommended as
shown. The six reserved pins must also be grounded
using a pull-down resistor as shown. If the iC-PMX
singleturn sensors are not used, HOP and HON should
be connected directly to GND.