Datasheet

SWCS049-019
TRACK bit
VDD1 enable
LDO4 MODE
Setting
time t
ON
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
0
1
N
0
1 N
WTCHDG_CNT
WTCHDG_IT
WTCHDG_OFF
WTCHDG_IT clearing
0
1
i
0
1
N
WTCHDG_CNT
Periodic mode:
Interrupt mode:
WTCHDG_OFF
interrupt clearing
TPS659110, TPS659112, TPS659113, TPS659116
www.ti.com
SWCS049L JUNE 2010REVISED MARCH 2014
Figure 13. Watchdog Signals
8.3.3.14 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 14. Tracking LDO
8.4 PWM And LED Generators
The TPS65911 device has two LED ON/OFF signal generators, LED1 and LED2. LED1 and LED2 have
independently controllable periods from 125 ms to 8 s and ON time from 62.5 to 500 ms. Within the period, one
or two ON pulses can be generated (control bit LED1(2)_SEQ). The user must take care to program period and
ON time correctly, because no limitation on selected values is imposed. LED1 and LED2 signals can be routed to
GPIO1 and GPO3 open-drain outputs, respectively. These GPIOs have a current sink capability of 10 mA.
The PWM generator frequency and duty cycle are set by the PWM_FREQ and PWM_DUTY_CYCLE bits,
respectively. The PWM generator signal can be connected to the GPIO3 or GPIO8 output. The PWM generator
uses the 3-MHz clock, which is not available in off mode. To enable the PWM in sleep mode, the
I2CHS_KEEPON bit must be set to 1.
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Product Folder Links: TPS659110 TPS659112 TPS659113 TPS659116