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© 2022 ROHM Co., Ltd.
65UG018E Rev.001
July 2022
User’s Guide
3.4. LED Indications
The EVK has a couple of LEDs to indicate the status of important board functions.
Figure 3: status LED indicators at successful system start-up
LED100 (INTB) and LED101 (ERRB) are controlled by the PMIC’s open-drain interrupt signal pins INTB and ERRB respectively. The
LEDs are on when the PMIC detects a warning and/or an error.
LED102 (PRSTB) is controlled by the PMIC’s open drain reset signal output. The LED is on when the reset signal is active.
LED60 (PG_VTT) is on when the output of the memory termination regulator BD35395 is ok.
LED301 (CALIB_COMP) and LED302 (TG_ERROR) should remain off after successful FPGA start up.
LED303 (INIT) is on when the initialization of the FPGA’s configuration memory is successful.
LED304 (DONE) indicates the successful completion of configuration.
3.5. Power-up
To power-up the board, follow these steps:
1. Remove both jumpers of connector CN130 (position 1-2 and 3-4).
2. Set switches OSC (SW302) = High, MODE (SW303) = Low, USER2 (SW502) = Low.
3. Connect a 24V/1.5A DC supply voltage to the input power connector.
4. CN130: first add jumper 1-2 (STBY). Only LED102 (PRSTB) should be on now.
5. CN130: add jumper 3-4 (EN). The PMIC is enabled. Now the red LED100 (INTB), red LED101 (ERRB) and red LED102
(PRSTB) are off. The blue LED60 is on.
6. The blue LED303 (INIT) and blue LED304 (DONE) should light up, too. Also, LED310 and LED302 should remain off. That
LED100 to LED101 remain off
LED301, LED302 remain off
LED501 flashing red
LED60 lights up in blue
LED303, LED304 light up in blue
LED502 lights up in red
