User's Guide
SLVUA61–April 2014
BQ24392EVM User's Guide
This document is the EVM user guide for the BQ24392. The BQ24392 is a charger detection IC with an
integrated USB 2.0 high-speed isolation switch for use with a micro- or mini-USB port. The device is
compatible with all BC1.2 chargers and detects both Apple®and TomTom™ chargers.
NOTE: This board is not designed to support high-current charging.
Contents
1 About this Manual............................................................................................................ 2
1.1 Information about Cautions and Warnings ...................................................................... 2
2 Introduction ................................................................................................................... 2
2.1 List of Hardware Items for Operation ............................................................................ 3
3 BQ24392 Implementation Guidelines..................................................................................... 4
3.1 Detection Overview................................................................................................. 4
3.2 Slow Plug-in Event.................................................................................................. 5
3.3 DBP Timer........................................................................................................... 5
3.4 Using the BQ24932 GPIOS ....................................................................................... 5
3.5 EVM Overview ...................................................................................................... 6
3.6 BQ24392 Quick Start Evaluation ................................................................................. 8
4 Board Documentation...................................................................................................... 12
4.1 Bill of Materials .................................................................................................... 12
4.2 Schematic .......................................................................................................... 13
4.3 Board Layout....................................................................................................... 14
5 Board Stackup and Layout Guidelines .................................................................................. 17
6 Related Documentation.................................................................................................... 17
List of Figures
1 EVM Block Diagram......................................................................................................... 3
2 Data Connections Recessed from Power Connections ................................................................ 5
3 Schematic for 3.3-V Output LDO .......................................................................................... 6
4 Schematic for GOOD_BAT Selection Header ........................................................................... 7
5 GOOD_BAT Selection Header on EVM .................................................................................. 7
6 Test Point Locations......................................................................................................... 7
7 LED Output Schematic...................................................................................................... 8
8 Device and USB Connections.............................................................................................. 8
9 EVM After High-Current Charger Attached............................................................................... 9
10 SDP with GOOD_BAT Low or Nonstandard Charger................................................................. 10
11 SDP with GOOD_BAT = High ............................................................................................ 10
12 USB Communication with Thumb Drive Through BQ24392.......................................................... 11
13 BQ24392EVM Schematic ................................................................................................. 13
14 Top Overlay................................................................................................................. 14
15 Top Layer.................................................................................................................... 14
16 Ground Layer ............................................................................................................... 15
17 Power Layer................................................................................................................. 15
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SLVUA61–April 2014 BQ24392EVM User's Guide
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