TLV320DAC3100 Test for Detection of Open Loads - TI. · PDF file2 TLV320DAC3100 Test for...

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Transcript of TLV320DAC3100 Test for Detection of Open Loads - TI. · PDF file2 TLV320DAC3100 Test for...

  • MICBIAS

    VOL/MICDET

    SPKM

    SPKP

    Class Ddriver

    DAC3100

    150 H

    150 H

    4.7 F

    4.7 F

    220 F

    220 F

    100 k

    100 k

    100 k

    10 kR1

    R2

    R3

    8- or 4-speaker

    Application ReportSLAA540BJune 2012Revised June 2013

    TLV320DAC3100 Test for Detection of Open Loads

    Wen-Shin Wang............................................................................................. MSA Catalog Applications

    ABSTRACT

    An open-load detection test can be implemented using headset-detection test of the TLV320DAC3100.This application note provides a summary of the headset-detection test with the TLV320DAC3100 EVMand how to use the headset-detection test to detect an open load.

    1 Test for Detection of Headsets

    Headset detection is normally used to determine if a headset has been inserted into the EVM. It can alsodetermine the type of headset, either with or without a microphone. This detection is accomplished byobserving the voltage on the MICDET input. See Figure 1 for schematic representation and Table 1 forthreshold voltages.

    Table 1. Voltage Threshold for Detection of Headsets

    REGISTER 67BITS REGISTER VALUE DESCRIPTION VOLTAGE THRESHOLD

    D6-D5

    00 0x80 No headset detected MICDET > approx. 0.91 MICBIAS (1) (2)

    01 0xA0 Headset without microphone detected MICDET < approx. 0.1 MICBIAS

    11 0xE0 Headset with microphone detected Approx. 0.1 MICBIAS < MICDET