Datasheet

INTERRUPT CONTROLLER AND SYSTEM SEQUENCING
Overview
INTERRUPT
CONTROLLER
INT
SDAT
SCLK
SEQUENCING
ANDOPERATING
MODESETTING
HOT_ RST
RESPWRON
TRSTPWON
SYS _IN
HOST INTERFACE ANDSEQUENCING
I2CENGINE I2CREGISTERS
NON-VOLATILE
MEMORY
CONTROL
LOGIC
1V
AC/USB/BAT
(HIGHERVOLTAGE)
VSYS
OUT
HOST
TPS65820
R 1
R 6
A1
C 16
R 5 R 3 R 2 R 4
C
TRSTPWON
2.5V
2.5V
A1
AND
TPS65820
SLVS663B – MAY 2006 – REVISED APRIL 2008 .............................................................................................................................................................. www.ti.com
The TPS65820 has two dedicated internal controllers that execute the host interface and system sequencing
tasks: a sequencing controller and an interrupt controller.
The sequencing controller monitors internal and system parameters and defines the sequencing of the internal
power supplies during power up and power down / power fault events, and executes specific internal power
supply reset operations under external hardware control or host software commands.
The following parameters are monitored by the sequencing controller :
• System power bus voltage (at SYS_IN pin), input supply voltage, battery pack voltage
• TPS65820 thermal fault status
• Integrated supply status
The interrupt controller monitors multiple system status parameters and signals to the host when one of the
monitored parameters toggled, as a result of a system status change. The interrupt controller inputs include all
the parameters monitored by the sequencing controller plus:
• Charger status
• Battery pack status
• ADC status
Internal I
2
C registers enable masking of all the monitored parameters. Using those registers the host can select
which parameters trigger an interrupt or a power good fault. Power good faults trigger a change in the TPS65820
operating mode, as detailed in the next sections.
A simplified block diagram for the TPS65820 sections that interface to the external host is shown in Figure 27 .
Figure 27. Simplified Block Diagram
32 Submit Documentation Feedback Copyright © 2006 – 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65820