ZHCSKD2A November 2019 – February 2021 TPS6521825
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Description (continued)
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1
Wake-Up and Power-Up and Power-Down Sequencing
- 8.3.1.1 Power-Up Sequencing
- 8.3.1.2 Power-Down Sequencing
- 8.3.1.3 Strobe 1 and Strobe 2
- 8.3.1.4 Supply Voltage Supervisor and Power-Good (PGOOD)
- 8.3.1.5 Backup Supply Power-Good (PGOOD_BU)
- 8.3.1.6 Internal LDO (INT_LDO)
- 8.3.1.7 Current Limited Load Switches
- 8.3.1.8 LDO1
- 8.3.1.9 Coin Cell Battery Voltage Acquisition
- 8.3.1.10 UVLO
- 8.3.1.11 Power-Fail Comparator
- 8.3.1.12 Battery-Backup Supply Power-Path
- 8.3.1.13 DCDC3 and DCDC4 Power-Up Default Selection
- 8.3.1.14 I/O Configuration
- 8.3.1.15 Push Button Input (PB)
- 8.3.1.16 AC_DET Input (AC_DET)
- 8.3.1.17 Interrupt Pin (INT)
- 8.3.1.18 I2C Bus Operation
- 8.3.1
Wake-Up and Power-Up and Power-Down Sequencing
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6 Register Maps
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.1.16 AC_DET Input (AC_DET)
The AC_DET pin is a CMOS-type input used in three different ways to control the power-up of the PMIC:
- In a battery operated system, AC_DET is typically connected to an external battery charger with an open-drain power-good output pulled low when a valid charger supply is connected to the system. A falling edge on the AC_DET pin causes the PMIC to power up.
- In a non-portable system, the AC_DET pin may be shorted to ground and the device powers up whenever system power is applied to the chip.
- If none of the above behaviors are desired, AC_DET may be tied to system power (IN_BIAS). Power-up is then controlled through the push-button input or PWR_EN input.
Portable Systems
Non-portable Systems
Disabled
Figure 8-27 AC_DET Pin Configurations
Figure 8-28 AC_DET Input Deglitch and Power-Up Timing (Portable Systems)In ACTIVE state, the TPS6521825 monitors the AC_DET input and issues an interrupt when the pin status changes, such as when it drops below or rises above the AC_DET input-low or input-high thresholds. The interrupt is masked by the ACM bit in the INT_MASK1 register.
Figure 8-29 AC_STATE PinNote:
Interrupts are issued whenever the AC_DET pin status changes. The AC_STATE bit reflects the current status of the AC_DET input.