TS3A226AEEVM

User's Guide SCDU003B – March 2013 – Revised August 2013 TS3A226AE Evaluation Board This user guide describes the TS3A226AE evaluation module (EVM) usage. This guide contains the EVM schematics, evaluation examples, and bill of materials to evaluate the performance of the TS3A226AE device. 1 2 3 4 5 Contents Introduction .................................................................................................................. EVM Setuup ................................................................................................................. 2.1 Boards ............................................................................................................... 2.2 Setup Procedure ................................................................................................... Evaluating TS3A226AE .................................................................................................... 3.1 Test with Different Types of Headsets .......................................................................... EVM Schematics ............................................................................................................ Bill of Materials .............................................................................................................. 1 2 2 2 3 3 4 5 List of Figures 1 TS3A226AE Evaluation board ............................................................................................ 2 2 TS3A226AE EVM Schematic.............................................................................................. 4 List of Tables 1 1 TS3A226AE Evaluation Module Signal Connections .................................................................. 2 2 Bill of Materials .............................................................................................................. 5 Introduction The TS3A226AE is an audio headset switch that detects 3- or 4-pole 3.5mm accessories. For a 4-pole accessory with a microphone, the TS3A226AE also detects the MIC location and routes the microphone and ground signals automatically. The ground signal is routed through a pair of low-impedance ground FETs (60mΩ typical), resulting minimal impact on audio cross-talk performance. The autonomous detection feature allows end users to plug in accessories with different audio pole configurations into the mobile device and have them operate properly with no added software control and complexity. The ground FETs of the device are designed to allow FM signal pass-through, making it possible to use the ground line of the headset as an FM antenna in mobile audio application. The TS3A226AE EVM is an evaluation module for the Texas Instruments TS3A226AE switch and it provides the basic functionality evaluation for the device. SCDU003B – March 2013 – Revised August 2013 Submit Documentation Feedback TS3A226AE Evaluation Board Copyright © 2013, Texas Instruments Incorporated 1 EVM Setuup 2 EVM Setuup 2.1 Boards www.ti.com One TS3A226AE Evaluation board is provided per EVM kit: Figure 1. TS3A226AE Evaluation board Table 1. TS3A226AE Evaluation Module Signal Connections Type Description Purpose J3 SMA Connector FM signal output If GND is used for FM signal transmission, FM receiver can be connected to this connector for sensitivity test. J4 RCA Connector For MIC signal output Can be connected to Codec for microphone testing. J5 RCA Connector RING1 connection Can be connected to Audio Amplifier (right channel) output for audio testing. J6 RCA Connector TIP connection Can be connected to Audio Amplifier (left channel) output for audio testing. J7 Audio Jack Connector Audio Jack for Headset plug in Plug in different Headset for TS3A226AE function verification Test Point headers are placed throughout the board to provide testing capability for each pin of the device and are labeled with the corresponding pin name beside the header pins. 2.2 Setup Procedure 2.2.1 • • 2.2.2 Equipment Required Power supply which can provide 2.6V to 4.7V Multi-meter Power up To provide the VDD to the TS3A226AE. Add the jumper for J1 and J2. 2 TS3A226AE Evaluation Board SCDU003B – March 2013 – Revised August 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Evaluating TS3A226AE www.ti.com External power supply input are supplied to the VDD test point (TP6) for VDD and GND test points (TP12) for GND. 3 Evaluating TS3A226AE 3.1 Test with Different Types of Headsets To evaluate the capability of headset detection for TS3A226AE, plug in different types of headsets (4-pole standard, 4-pole OMTP, or regular TRS) to the headset jack J7, and check the detection result. (1) 4-Pole Standard/ North American Headsets: L R G M If a 4-pole standard/North American headset is plugged-in, below table can be used to check the detection result by measuring the resistor through the hand multi-meter. TEST POINTS Negative Pole Positive Pole Measured Value(Ω) TP13(MICP) TP15(SLEEVE) ≤10 TP13(MICP) TP16(RING2) >1K TP21(GNDA) TP15(SLEEVE) >1K TP12(GNDB) TP16(RING2) ≤2 (2) 4-Pole OMTP Headsets: L R M G If a 4-pole OMTP headset is plugged-in, below table can be used to check the detection result by measuring the resistor through the hand multi-meter. TEST POINTS Negative Pole Positive Pole Measured Value(Ω) TP13(MICP) TP15(SLEEVE) >1K TP13(MICP) TP16(RING2) ≤10 TP21(GNDA) TP15(SLEEVE) ≤2 TP12(GNDB) TP16(RING2) >1K (3) RS Audio Headset: L R G If a regular TRS headset without integrated microphone is plugged-in, below table can be used to check the detection result by measuring the resistor through the hand multi-meter. TEST POINTS Negative Pole Positive Pole Measured Value(Ω) TP13(MICP) TP15(SLEEVE)