Detailed description

Detailed description of the HIL DSP 180 Interface

The board features the following key sections, as shown in Figure 1.

  1. HIL Analog connector
  2. HIL Digital connector
  3. HSEC 180 card connector
  4. Power supply
  5. CAN bus connector
  6. JTAG connector

Figure 1: HIL DSP 180 Interface layout

HIL Analog I/O

Up to 24 analog outputs (AOs), and up to 3 analog inputs (AIs), are routed from the DIN41612 socket (HIL side) to the HSEC 180 connector (DSP side).

To protect against overvoltage conditions, HIL analog outputs feature series 120Ω RZ1-RZ24 resistors that, together with TI Control Card ADC protection diodes (U6-U11), act as a 0-3.3V clamping circuit.

Table 1. Analog signal routing
HIL Analog Output DSP signal
AO1/AI1* ADC–A0/DAC-A

AO2/AI2*

ADC–A1/DAC-B

AO3 ADC–A2
AO4 ADC–A3
AO5 ADC–A3
AO6 ADC–A5
AO7 ADC–14
AO8 ADC–15
AO9 ADC–B0
AO10/AI3* ADC-B1/DAC-C
AO11 ADC–B2
AO12 ADC–B3
AO13 ADC–B4
AO14 ADC–B5
AO15 ADC–D0
AO16 ADC–D1
AO17 ADC-C2
AO18 ADC-C3
AO19 ADC-C4
AO20 ADC-C5
AO21 ADC-D2
AO22 ADC-D3
AO23 ADC-D4
AO24 ADC-D5

* Depending on the position of the R1, R2, or R3 jumpers, this HIL AO or HIL AI may be routed to the DSP analog pin. By default, HIL AOs are routed to the DSP ADC.

HIL Digital I/O

Up to 24 analog outputs, and up to 3 analog inputs, are routed from the DIN41612 socket (HIL side) to the HSEC 180 connector (DSP side).

To protect against overvoltage conditions, HIL analog outputs feature series 120Ω RZ1-RZ24 resistors that, together with TI Control Card ADC protection diodes (U6-U11), act as a 0-3.3V clamping circuit.

Table 2. HIL Digital Output signal routing
HIL Digital Output signal DSP Digital Input signal
DO1 GPIO-54/QEP-2A
DO2

GPIO-55/QEP-2B

DO3 GPIO-56/QEP-2S
DO4 GPIO-57/QEP-2I
DO5 GPIO-50
DO6 GPIO-51
DO7 GPIO-52
DO8 GPIO-53
DO9 GPIO-35
DO10 GPIO-36
DO11 GPIO-37
DO12 GPIO-38
DO13 GPIO-60
DO14 GPIO-61
DO15 GPIO-62
DO16 GPIO-63
Table 3. Digital signal routing
HIL Digital Input signal DSP Digital Input signal
DI1 GPIO-00/PWM-1A
DI2 GPIO-02/PWM-2A
DI3 GPIO-04/PWM-3A
DI4 GPIO-06/PWM-4A
DI5 GPIO-08/PWM-5A
DI6 GPIO-10/PWM-6A
DI7 GPIO-01/PWM-1B
DI8 GPIO-03/PWM-2B
DI9 GPIO-05/PWM-3B
DI10 GPIO-07/PWM-4B
DI11 GPIO-09/PWM-5B
DI12 GPIO-11/PWM-6B
DI13 GPIO-14/PWM-8A
DI14 GPIO-12/PWM-7A
DI15 GPIO-15/PWM-8B
DI16 GPIO-13/PWM-7B
DI17 GPIO-34
DI18 GPIO-39
DI19 GPIO-40
DI20 GPIO-41
DI21 GPIO-44
DI22 GPIO-45
DI23 GPIO-48
DI24 GPIO-49

HSEC 180 Connector

The HSEC 180 connector is a standardized connector for Texas Instruments 180 pin Control Cards. Note that, while various cards share the same pinout, the HIL DSP 180 Interface was designed and tested only with the following Control Cards in mind:

Power Supply

The DSP 180 Interface is powered by a 5V rail, supplied directly from HIL User PSU section, or from the onboard 5V buck regulator (powered externally from a 12V DC power supply).

For use cases when the Control Card is used separately from the HIL, in a standalone configuration, it is possible to configure the HIL DSP 180 Interface Board to be powered from an external power source, via an onboard selector switch. This turns the HIL DSP180 Interface Board into a generic Control Card development board.

When this selector switch, labeled DSP PWR, is in the "HIL" position, the 5V rail of TI Control Card is supplied directly from the HIL 5V rail. In this mode, no external adapter is required.

When the selector switch is set to "EXT", the board is powered from an external 12V DC power supply, with the following indicator LED status indicators:
  • PGOOD (ON when rail is lower than 5V or output current higher than 1A)
  • PWR (ON when 5V rail is present)

CAN bus

The Control Card DSP’s CAN-A module (GPIO-30/CANRX-A and GPIO-31/CANTX-A) is connected to the onboard CAN transceiver, SN65HVD232D from Texas Instruments, which forms the 3.3V CAN bus as shown on the Figure 2.

The CAN bus is accessible over the RJ45 connector and it is terminated with two 120Ω resistors. If the external 3.3V CAN bus is connected to the HIL DSP 180 Interface CAN bus, care must be taken to remove the redundant terminating resistors on both busses. On the DSP 180 Interface, this is done by removing the RSC2 (0Ω) resistor.

Figure 2: CAN bus section schematic

JTAG

The JTAG section consists of the JTAG header, with a pinout shown on the Figure 3.

Figure 3: JTAG header pinout

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