(size approx. 68 mm x 102 mm) TERMINAL DESCRIPTION
Figure 2: Terminals
P1 5 V Power Jack (plus pole on inside)P2 5 V External Supply Input and Ground
Change power selection jumper to EXT.(Typ. ≈ 60 mA, ≈ 130 mA with loaded outputs)
P3 USB Connector (Mini B)
P4* External SPI Interface(for in-circuit programming of externaliC-TW28)
P5 Board Power Selector:from USB (P3) or EXT (P1 or P2)
P6* External Encoder Link Interface(for in-circuit programming of externaliC-TW28)
P7 Controller Interface(factory programming)
P8 Terminal to on-board LED D7
P9 Sensor Interface (Inputs)3.3 V Supply Output to SensorSIN +/– Sine Signal InputsCOS +/– Cosine Signal InputsZERO +/– Index Signal InputsGND Ground Link to SensorLED LED Output of iC-TW28
P10 Onboard SPI InterfaceThis port is controlled by the evalboard’s MCU when the GUI is running.
P11 Encoder Interface (Outputs)3.3 V Supply OutputA+, A– A/U Signal OutputsB+, B– B/V Signal OutputsZ+, Z– Z/W Signal OutputsGND Ground Link
The TW28_1D evaluation board can be used as a pro-gramming adapter for in-circuit programming of an ex-ternal iC-TW28 (the target device). The target devicecan be a second evaluation board or part of a customermodule or product.
Two methods are provided for in-circuit programming,SPI and Encoder Link. SPI programming can only beused when the external iC-TW28 is in serial configura-tion mode (PINCFG = 0V). Encoder Link programmingcan be used in both serial and pin configuration modes.
SPI ProgrammingFor SPI programming, the external SPI interface ofthe TW28_1D evaluation board (P4) is used to com-municate with the target device. The target iC-TW28must be in serial communication mode (PINCFG = 0V)
and powered. The required connections are shown inTable 1.
For example, if the target device is a second TW28_1Devaluation board, connect P4 of the first TW28_1Dboard (the PC adapter) to P10 of the second board (thetarget device) as shown in Figure 4.
Figure 4: Using the TW28_1D as a PC Adapter for SPI Programming of a Target Device
The target TW28_1D board must be powered externallyusing either P1 (as shown) or P2, and P5 must be set toEXT. Do not connect a PC to the USB interface (P3) onthe target board. Note that when using a 10-conductorribbon cable as shown, the xIRQ LED (D8) on the targetTW28_1D board is illuminated whether or not a fault orinterrupt request exists.
The PC adapter TW28_1D board is connected to a PCrunning the GUI software and powered from the USBinterface (P5 set to USB). Activate the external SPI in-terface on the PC adapter TW28_1D board by selectingSPI from the GUI Interface menu as shown in Figure 5.
Figure 5: Activating the External SPI Interface
The SPI LED (D6) near P4 illuminates to indicate thatthe external SPI interface is active.
Confirm SPI communication with the target iC-TW28 byverifying that the chip serial number in the Device Infoblock of the GUI is that of the target device and not thatof the iC-TW28 on the PC adapter TW28_1D board asshown in Figure 6.
Figure 6: Verify Target iC-TW28 Serial Number
Encoder Link ProgrammingFor encoder link programming, the external encoderlink interface of the TW28_1D evaluation board (P6) isused to communicate with the target device using theA+ and A– encoder outputs. The required connectionsare shown in Table 2.
For example, if the target device is a second TW28_1Devaluation board, connect P6 of the PC adapterTW28_1D board (left) to P11 of the target TW28_1Dboard (right) as shown in Figure 7.
Figure 7: Using the TW28_1D as a PC Adapter for Encoder Link Programming of a Target Device
The target TW28_1D board must be powered externallyusing either P1 (as shown) or P2, and P5 must be setto EXT. Do not connect a PC to the USB interface (P3)on the target board. Any terminating resistor on the A+or A– outputs of the target device must be removedbefore attempting to use encoder link.
The PC adapter TW28_1D board is connected to a PCrunning the GUI software and powered from the USBinterface (P5 set to USB). Enable the external encoderlink interface on the PC adapter TW28_1D board byselecting ELink from the GUI Interface menu as shownin Figure 8.
Figure 8: Enabling the External Encoder LinkInterface
The ELink LED (D5) near P6 illuminates to indicate thatthe external encoder link interface is enabled.
Activate the encoder link interface on the PC adapterTW28_1D board by clicking Start ELink in the GUI Inter-face menu (see Figure 8). This sends the encoder linkactivation sequence from the PC adapter TW28_1Dboard to the target.
Confirm encoder link communication with the targetiC-TW28 by verifying that the chip serial number in theDevice Info block of the GUI is that of the target de-vice and not that of the iC-TW28 on the PC adapterTW28_1D board as shown in Figure 6.
Note that if the target board is reset or power cycled,encoder link must be re-activated by clicking Start Elinkin the GUI Interface menu again.
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