Datasheet

TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
4.5.2.1 C027.0 Mode ....................................................................................... 59
4.5.2.2 C021.M Mode ...................................................................................... 59
4.5.3 Power-On Sequence ........................................................................................... 59
4.5.3.1 Timings Before Sequence_Start ................................................................. 59
4.5.3.2 OMAP2 Power-On Sequence .................................................................... 60
4.5.3.3 OMAP3 Power-On Sequence .................................................................... 61
4.5.3.4 Power On in Slave_C021_Generic Mode ....................................................... 63
4.5.4 Power-Off Sequence ........................................................................................... 63
4.5.4.1 Power-Off Sequence in Master Modes .......................................................... 63
5 Real-Time Clock and Embedded Power Controller ................................................................. 65
5.1 RTC ......................................................................................................................... 65
5.1.1 Backup Battery .................................................................................................. 65
5.2 EPC ......................................................................................................................... 65
6 Audio/Voice Module ........................................................................................................... 66
6.1 Audio/Voice Downlink (RX) Module ..................................................................................... 67
6.1.1 Earphone Output ................................................................................................ 67
6.1.1.1 Earphone Output Characteristics ................................................................ 67
6.1.1.2 External Components and Application Schematic ............................................. 68
6.1.2 8-Ω Stereo Hands-Free ........................................................................................ 68
6.1.2.1 8-Ω Stereo Hands-Free Output Characteristics ................................................ 68
6.1.2.2 External Components and Application Schematic ............................................. 69
6.1.3 Headset .......................................................................................................... 70
6.1.3.1 Headset Output Characteristics .................................................................. 70
6.1.3.2 External Components and Application Schematic ............................................. 72
6.1.4 Headset Pop-Noise Attenuation .............................................................................. 75
6.1.5 Predriver for External Class-D Amplifier ..................................................................... 76
6.1.5.1 Predriver Output Characteristics ................................................................. 76
6.1.5.2 External Components and Application Schematic ............................................. 77
6.1.6 Vibrator H-Bridge ............................................................................................... 78
6.1.6.1 Vibrator H-Bridge Output Characteristics ....................................................... 78
6.1.6.2 External Components and Application Schematic ............................................. 78
6.1.7 Carkit Output .................................................................................................... 79
6.1.8 Digital Audio Filter Module .................................................................................... 80
6.1.9 Digital Voice Filter Module ..................................................................................... 80
6.1.9.1 Voice Downlink Filter (Sampling Frequency at 8 kHz) ........................................ 81
6.1.9.2 Voice Downlink Filter (Sampling Frequency at 16 kHz) ...................................... 82
6.1.10 Boost Stage ..................................................................................................... 82
6.2 Audio/Voice Uplink (TX) Module ......................................................................................... 84
6.2.1 Microphone Bias Module ...................................................................................... 84
6.2.1.1 Analog Microphone Bias Module Characteristics .............................................. 85
6.2.1.2 External Components and Application Schematic ............................................. 86
6.2.1.3 Digital Microphone Bias Module Characteristics ............................................... 87
6.2.1.4 Silicon Microphone Characteristics .............................................................. 89
6.2.2 Stereo Differential Input ........................................................................................ 90
6.2.3 Headset Differential Input ...................................................................................... 90
6.2.4 FM Radio/Auxiliary Stereo Input .............................................................................. 91
6.2.4.1 External Components ............................................................................. 91
6.2.5 PDM Interface for Digital Microphones ...................................................................... 91
Copyright © 2008–2011, Texas Instruments Incorporated Contents 3