Hi.
My customer is testing using TAS2505.
Normal Operation : Initialize TAS2505 => I2S Audio Signal input => Normal Output and Normal Operation.
But,
When I2S input audio signal is off, speaker is heating and burning smell comes out from speaker wire after few minutes.
And Even if I2S is turned on in this situation, speaker output does not come out.
Method of recover is only re-initialize TAS2505.
What is this symptom? Please let me know debugging point.
They using 4ohm/2W speaker and code is example code in application note 4.0.7.
I attached sch file and SPKP, SPKM waveforms.
Normal Operating Waveform and I2S Off waveform and heating and burning waveform.
[SCH]
[normal waveform]
[I2S Off waveform]
[Heating and burning waveform]
4.0.7 Example Register Setup to Play Digital Data Through DAC and Headphone/Speaker Outputs
# I2C Script to Setup the device in Playback Mode
# Key: w 30 XX YY ==> write to I2C address 0x30, to register 0xXX, data 0xYY
# This script set DAC output routed to HP Driver and Class-D driver via Mixer
# # ==> comment delimiter
# Page switch to Page 0
W 30 00 00
# Assert Software reset (P0, R1, D0=1)
W 30 01 01
# Page Switch to Page 1
W 30 00 01
# LDO output programmed as 1.8V and Level shifters powered up. (P1, R2, D5-D4=00, D3=0)
W 30 02 00
# Page switch to Page 0
W 30 00 00
# PLL_clkin = MCLK, codec_clkin = PLL_CLK, MCLK should be 11.2896MHz (P0, R4, D1-D0=03)
w 30 04 03
# Power up PLL, set P=1, R=1, (Page-0, Reg-5)
w 30 05 91
# Set J=4, (Page-0, Reg-6)
w 30 06 04
# D = 0000, D(13:8) = 0, (Page-0, Reg-7)
w 30 07 00
# D(7:0) = 0, (Page-0, Reg-8)
w 30 08 00
# add delay of 15 ms for PLL to lock
d 15
# DAC NDAC Powered up, NDAC=4 (P0, R11, D7=1, D6-D0=0000100)
W 30 0B 84
# DAC MDAC Powered up, MDAC=2 (P0, R12, D7=1, D6-D0=0000010)
W 30 0C 82
# DAC OSR(9:0)-> DOSR=128 (P0, R12, D1-D0=00)
W 30 0D 00
# DAC OSR(9:0)-> DOSR=128 (P0, R13, D7-D0=10000000)
W 30 0E 80
# Codec Interface control Word length = 16bits, BCLK&WCLK inputs, I2S mode. (P0, R27, D7-
D6=00, D5-D4=00, D3-D2=00)
W 30 1B 00
# Data slot offset 00 (P0, R28, D7-D0=0000)
W 30 1C 00
# Dac Instruction programming PRB #2 for Mono routing. Type interpolation (x8) and 3 programmable
Biquads. (P0, R60, D4-D0=0010)
W 30 3C 02
# Page Switch to Page 1
W 30 00 01
# Master Reference Powered on (P1, R1, D4=1)
W 30 01 10
# Output common mode for DAC set to 0.9V (default) (P1, R10)
W 30 0A 00
# Mixer P output is connected to HP Out Mixer (P1, R12, D2=1)
w 30 0C 04
# HP Voulme, 0dB Gain (P1, R22, D6-D0=0000000)
W 30 16 00
# No need to enable Mixer M and Mixer P, AINL Voulme, 0dB Gain (P1, R24, D7=1, D6-D0=0000000)
W 30 18 00
# Power up HP (P1, R9, D5=1)
w 30 09 20
# Unmute HP with 0dB gain (P1, R16, D4=1)
w 30 10 00
# SPK attn. Gain =0dB (P1, R46, D6-D0=000000)
W 30 2E 00
# SPK driver Gain=6.0dB (P1, R48, D6-D4=001)
W 30 30 10
# SPK powered up (P1, R45, D1=1)
W 30 2D 02
# Page switch to Page 0
W 30 00 00
# DAC powered up, Soft step 1 per Fs. (P0, R63, D7=1, D5-D4=01, D3-D2=00, D1-D0=00)
W 30 3F 90
# DAC digital gain 0dB (P0, R65, D7-D0=00000000)
W 30 41 00
# DAC volume not muted. (P0, R64, D3=0, D2=1)
W 30 40 04
#
