TAS5715
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SLOS645 –AUGUST 2010
Headphone-Mode All-Channel Shutdown
HP/SPKR
(SE/BTL)
VALID
PWM_A(L+)
PWM_C(R+)
HPL/R
t(mute)
HPL/R
t(exitSDHP)
t(enterSDHPamp)
t(exitSDHPamp)
PWM_B(L–)
PWM_D(R–)
FAULT = 1 Output
HPSD
(A0/FAULT)
Hi-Z (Ext. Pulldown)
I2C: SCL
SDA
Disable
FAULT
Enter
ACSD
Exit
ACSD
Enable
FAULT
HP
Config
Mute
Unmute
PDN
T0454-01
PARAMETE
R
DESCRIPTION
Mute volume ramp wait time (t(volramp) given by register 0x0E <2:0>)
MIN
TYP
MAX
UNIT
ms
5 + 1.3 ×
t(volramp)
t(mute)
Exit shutdown wait time before enabling external headphone amp (t(HPchg)
given by register 0x1A<6:5>)
t(exitSDHP)
1 + 1.3 × t(HPchg)
ms
Headphone amp exit shutdown wait time before unmuting (t(HPamp) given by
register 0x1C<7:4>)
1 + 1.3 ×
t(HPamp)
t(exitSDHPamp)
t(enterSDHPamp)
ms
Headphone amp enter shutdown wait time before entering ACSD (t(HPamp)
given by register 0x1C<7:4>)
1 + 1.3 ×
t(HPamp)
ms
Figure 59. Headphone Control ACSD
Applying Soft Reset
To soft-reset the device, write 0x01 to register 0xC8. Once soft reset is applied, I2C commands should not be
sent for a duration of 2 × (1 ms + 1.3 × t(start/stop)) + 13.5 ms.
Restrictions in Using 432-kHz Output Switching
•
•
•
•
Only 48-kHz LRCLK is supported. The maximum allowed variance on LRCLK is 1%.
The maxmimum allowed MCLK frequency is 12.288 MHz + 1%.
Only 64-fS SCLK is supported.
PWM headphone output is not supported.
I2C Commands to enable 423-kHz Switching
All I2C write operations should be at 100 kHz when used in this higher switching mode.
No 400-kHz I2C is supported when used in this mode.
To switch into 432-kHz switching mode, send the following commands before sending the exit shutdown
command to register 0x05.
•
Write to register 0xF8 with a value of 0xA5A5A5A5.
Copyright © 2010, Texas Instruments Incorporated
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