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User’s Guide
BD96801-SPA7-EVK-301
© 2022 ROHM Co., Ltd.
65UG018E Rev.001
July 2022
5. Power sequencing
The below graph shows the power-up sequencing of the power supply rails:
VIN, 5.0V
STDBY
EN
Internal
state
BUCK1, 1.8V
BUCK2, 1.35V
BUCK3+4, 1.0V
LDO5, 2.5V
LDO6, 2.5V
LDO7, 3.3V
PRSTB
INTB
ERRB
SHUT_OFF INITIALIZATION
STANDBY
POWER_ON
ACTIVE
VTT, 0.675V
Figure 13: start-up sequence (1 = 5.0V; 2 = 1.0V; 3 = 1.8V; 4 = 1.35V, 2.5V, 3.3V; 5 = 0.675V)
6. Troubleshooting
Power supply:
Primary buck regulator BD9F500: the primary buck regulator provides 5V to power the PMIC BD96801. Please verify the 5V output at
TP3 (V_5.0) and TP4 (GND).
PMIC BD96801: the PMIC starts up when first inserting a jumper between pins 1-2 of connector CN130, and then a jumper between
pins 3-4 of the same connector. When the PMIC has successfully started-up, LED 100 to LED102 should be off and LED60 should be
on. If this is not the case, then either the 5V supply is not present, or one (or more) outputs of the PMIC are not present. Further
