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SWCS049B 数据表(PDF) 57 Page - Texas Instruments |
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SWCS049B 数据表(HTML) 57 Page - Texas Instruments |
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57 / 144 page  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 57 TPS65911 www.ti.com SWCS049S – JUNE 2010 – REVISED AUGUST 2018 Submit Documentation Feedback Product Folder Links: TPS65911 Detailed Description Copyright © 2010–2018, Texas Instruments Incorporated 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 |
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