SWCS049A datasheet(57/144 Pages) TI

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SWCS049-019

TRACK bit

VDD1 enable

LDO4 MODE

Setting

time t

LDO4

No Tracking 1 to 3.3 V

LDO4

Tracking 0.6 to 1.5 V

(LDO4 has same

level as VDD1)

LDO4

Tracking 0.8 V to 1.5 V

LDO4

Tracking 0.6 V

(LDO4 has same

level as VDD1)

SWCS049-013

WTCHDG_CNT

WTCHDG_IT

WTCHDG_OFF

WTCHDG_IT clearing

WTCHDG_CNT

Periodic mode:

Interrupt mode:

WTCHDG_OFF

interrupt clearing

TPS65911

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SWCS049S – JUNE 2010 – REVISED AUGUST 2018

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Product Folder Links: TPS65911

Detailed Description

6.5.3.13 Watchdog

The watchdog has two modes of operation.

In periodic operation, an interrupt is generated with a regular period defined by the WTCHDG_TIME

setting. The IC initiates WTCHDOG shutdown if the interrupt is not cleared within the period. The

watchdog interrupt WTCHDOG counter is reinitialized when NRESPWRON is low.

In interrupt mode the IC initiates WTCHDOG counter when interrupt is set pending and is cleared when

interrupt is cleared. If no interrupt is cleared before watchdog expiration within WTCHDG_TIME, the

device goes to off mode.

By default, periodic watchdog functionality is enabled with the maximum WTCHDG_TIME period.

Figure 6-2. Watchdog Signals

6.5.3.14 Tracking LDO

LDO4 has an optional mode where its output level follows that of VDD1, from 0.6 to 1.5 V, when VDD1 is

active. When VDD1 is set to off, the LDO4 output is defined by the SEL[7:2] bits in LDO4_REG, and can

be set from 0.8 to 1.5 V.

Tracking mode is enabled by setting TRACK = 1 in DCDCCTRL_REG. In initial activation, VDD1 must be

enabled and allowed to settle before enabling tracking mode. After initial activation, tracking mode can be

kept enabled while VDD1 is turned off. The value of TRACK is set to default (0) after any turnoff event.

Figure 6-3. Tracking LDO

SWCS049A Datasheet(PDF) 57 Page - Texas Instruments

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