Troubleshooting - Broadcom ACPL-C740 User Manual

ACPL-C740 Evaluation Kit Board User Guide
PCB Modifications
1. Vdd1 is supplied from the 5V/5V isolated DC-DC converter using the push-pull transformer method. Vdd1 can also be
supplied externally. To do that, ensure that R1 is disconnected.
2. The ACPL-C740 Vdd2 is supplied from the 3.3V regulator. To check the performance or troubleshoot the ACPL-C740
component only at Vdd2 = 5V, short Pin 1 and Pin2 of the J5 connector on the C740-SDM-EVBDv2 board. The Vdd2 is
then supplied directly from the USB power, 5VCC.
Note that R18 must be removed on the FPGA-EVBD board.
3. Green LED1–4 signals the detection of ACPL-C740. To modify the FPGA, use these LED indicators for other functions.
4. The H1 and H2 connector pins are physically connected to the FPGA. To modify the FPGA, use these connector pins
for input (I/P) or input/output (I/O).

Troubleshooting

If the green DONE LED does not come on after switching on SW1, reset the FPGA by pressing SW2 once. If the problem
arises, perform a full board reset by pressing SW3 once.
Each evaluation board is functionally checked and tested. before being sent to the customer. If a problem continues to arise,
consult a Broadcom Application Engineer. If need be, Broadcom will send a new board.
Appendix
Figure 6: PCB Description
pSemi PE22100
Wurth 750313638
transformer driver
transformer coil
Ablic S-1200B50
5V-5V voltage
regulator
Isolated DC -DC Converter
Shunt
Resistor
Mounting
C740-SDM-Evbdv2
ACPL-C740
Isolated Sigma-
Delta Modulator
Broadcom
I/O pins
physically
connected to
Xilinx JTAG
FPGA
Interface
ACPL-C40 Low
Xilinx Spartan
Voltage Side
XC3S250E
Connections
FPGA
LED1-4 indicates
that FPGA detects
ACPL-C740
Undefined LED
2,3,4 Indicators
FPGA-Evbd
I/P pins
LED "DONE"
physically
indicates power
connected to
on sequence
FPGA
complete
Isolated Sigma-Delta Modulator
SW2 reset SW3 board
FPGA to power on
default setting sequence reset
LED "HB" Nonvolatile flash
application memory to store
software is FPGA bitfile
running
USB UART /
FIFO IC
LED "UPLOAD"
indicates FPGA
bitfile is being
uploaded
USB
Connector
Interface
EEPROM to
store USB
chipset
settings
LED "5VIN"
indicates
presence of USB
connection
SW1 board turn
on switch
ACPL-C740-EvalKit-UG100
9