DA9232 datasheet(29/51 Pages) RENESAS

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DA9232

High Efficiency, Ultra-Low Quiescent Current and Ultra-

Low Output Ripple Buck Regulator

NDA Confidential

Datasheet

CFR0011-120-00 Rev 5

29 of 50

BUCK_EN = 0 needs to set register bit BUCK_PD_CFG2 = 0. The output of the buck regulator is

discharged through VBUCK_SNS pin and an internal buck output discharge FET with typical 33

Ω

resistance.

10.3.9

Event Flag and Fault Control

DA9232 has the flexibility for customers to control the behavior of buck when there is a fault

condition. There are five register bits (UVLO_FRC_DIS, OV_DIS_BUCK, OC_BUCK_EVENT,

SC_DIS_BUCK) controlling whether the buck will be disabled when the corresponding fault condition

happens. In addition, users can choose whether to mask or unmask the event flag when the fault

condition happens.

When there is a VDD Under-voltage condition, buck will be forced OFF if UVLO_FRC_DIS = 1. Buck

will remain alive if UVLO_FRC_DIS = 0. During the VDD Under-voltage condition, the event register

bit VIN_UV_EVENT = 1 if the corresponding mask register bit M_VIN_UV is set to 0 otherwise

VIN_UV_EVENT = 0.

When there is an over-voltage fault at buck output, buck will be forced OFF if OV_DIS_BUCK = 1.

Buck will continue switching if OV_DIS_BUCK = 0. During the fault, OV_BUCK_EVENT is set to 1 if

M_OV_BUCK_EVENT = 0 otherwise OV_BUCK_EVENT = 0.

When the over-current condition in buck persists for 64 µs and M_OC_BUCK_EVENT is set to 0,

OC_BUCK_EVENT will be set to 1. If OC_DIS_BUCK = 1, BUCK is forced disabled. If

OC_DIS_BUCK = 0, buck will continue switching during the over-current condition.

When there is a buck Output under-voltage condition and M_UV_BUCK_EVENT = 0,

UV_BUCK_EVENT is set to 1. If both buck output under-voltage and over-current condition exist and

SC_DIS_BUCK = 1, buck will be forced OFF. If SC_DIS_BUCK = 0, buck will continue switching

without shutting down by the under-voltage protection.

DA9232 also has a fault recovery mechanism that can be customized through the 3-bits

RCVRY_NUM. This value determines the fault recovery trial number for buck and is counted down

by every fault that triggers buck OFF. When RCVRY_NUM reaches 0, recovery trial is ended and

buck will remain OFF even if the buck enable signals are toggled HI. If RCVRY_NUM is set to 0x7,

there will be no count down on the recovery trial number and recovery trail will not be ended. Before

RCVRY_NUM reaches 0, buck will be recovered automatically if the fault condition disappears.

Event flags are not automatically cleared when the fault conditions disappear. They have to be

cleared by changing the values in register EVENT through I2C.

Revision 2.

8-Feb-2022

22 Renesas Electronics

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