Datasheet

TUSB1211
www.ti.com
SLLSE80A MARCH 2011 REVISED JANUARY 2012
10 USB Battery Charger Detection and ACA Feature
In order to support Battery Charging Specification v1.1 April 2009 [BCS v1.1], a charger detection module
is included inside TUSB1211 module.
This feature includes:
Battery charger detection sensing and control on DP/DM lines
ACA (Accessory Charger Adapter) detection and control on ID line
The detection mechanism aims at distinguishing several types of power sources that can be connected on
VBUS line:
Dedicated Charging Port
Standard Downstream Port
Charging Downstream Port
Hardware includes:
a dedicated voltage referenced pullup on DP line
a dedicated current controlled pulldown on DM line
a detection comparator on DM line - a control/detection finite state machine (FSM) including timers
a charger detection output pin (CHRG_DET) for external charger control
detection comparators on ID line
ID pin status detection (as defined per OTG v1.3 standard as well as ACA resistor types as described in
BCS v1.1) and DP/DM Single-Ended receivers (as defined per USB v2.0 standard) are also used to
determine the type of device plugged on USB connector.
USB charger detection is an independent feature, on V
BAT
supply domain, using CK32K clock.
10.1 USB Battery Charger Detection Modes
There are 3 modes of operation of battery charger detection module:
1. Hardware Charger Detection Module
2. Software Mode
3. Software FSM Mode
10.2 Accessory Charger Adapter (ACA) Detection
Accessory Charger Adapter (ACA) feature is defined in the USB Battery Charging Specification Rev. 1.1
specification. ACA allows simultaneous connection of a USB Charger or Charging Downstream Port and
an Accessory to a portable OTG device (TUSB1211).via only a single USB OTG port.
Copyright © 20112012, Texas Instruments Incorporated USB Battery Charger Detection and ACA Feature 19
Submit Documentation Feedback
Product Folder Link(s): TUSB1211