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參數(shù)資料
| 型號： | TLV320AIC32IRHB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 29/76頁 |
| 文件大?。?/td> | 1124K |
| 代理商： | TLV320AIC32IRHB |
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SHORT CIRCUIT OUTPUT PROTECTION
CONTROL REGISTERS
SLAS479B – AUGUST 2005 – REVISED AUGUST 2006
power-on delay, the TLV320AIC32 includes an option for the output pins of the drivers to be weakly driven to the
VCM level they would normally rest at when powered with no signal applied. This output VCM level is
determined by an internal bandgap voltage reference, and thus results in extra power dissipation when the
drivers are in powerdown. However, this option provides the fastest method for transitioning the drivers from
powerdown to full power operation without any output artifact introduced.
The device includes a further option that falls between the other two – while it requires less power drawn while
the output drivers are in powerdown, it also takes a slightly longer delay to power-up without artifact than if the
bandgap reference is kept alive. In this alternate mode, the powered-down output driver pin is weakly driven to a
voltage of approximately half the DRVDD1/2 supply level using an internal voltage divider. This voltage will not
match the actual VCM of a fully powered driver, but due to the output voltage being close to its final value, a
much shorter power-up delay time setting can be used and still avoid any audible output artifacts. These output
voltage options are controlled in Page-0/Reg-42.
The high power output drivers can also be programmed to power up first with the output level control in a highly
attenuated state, then the output driver will automatically slowly reduce the output attenuation to reach the
desired output level setting programmed. This capability is enabled by default and can be controlled by
Page-0/Reg-40.
The TLV320AIC32 includes programmable short-circuit protection for the high power output drivers, for
maximum flexibility in a given application. By default, if these output drivers are shorted, they will automatically
limit the maximum amount of current that can be sourced to or sunk from a load, thereby protecting the device
from an over-current condition. In this mode, the user can read Page-0/Reg-95 to determine whether the part is
in short-circuit protection or not, and then decide whether to program the device to power down the output
drivers. However, the device includes further capability to automatically power down an output driver whenever it
does into short-circuit protection, without requiring intervention from the user. In this case, the output driver will
stay in a power down condition until the user specifically programs it to power down and then power back up
again, to clear the short-circuit flag.
The control registers for the TLV320AIC32 are described in detail below. All registers are 8 bit in width, with D7
referring to the most significant bit of each register, and D0 referring to the least significant bit.
Page 0 / Register 0:
Page Select Register
BIT(1)
READ/
RESET
DESCRIPTION
WRITE
VALUE
D7–D1
X
0000000
Reserved, write only zeros to these register bits
D0
R/W
0
Page Select Bit
Writing zero to this bit sets Page-0 as the active page for following register accesses. Writing a
one to this bit sets Page-1 as the active page for following register accesses. It is recommended
that the user read this register bit back after each write, to ensure that the proper page is being
accessed for future register read/writes.
(1)
When resetting registers related to routing and volume controls of output drivers, it is recommended to reset them by writing directly to
the registers instead of using software reset.
Page 0 / Register 1:
Software Reset Register
BIT
READ/
RESET
DESCRIPTION
WRITE
VALUE
D7
W
0
Software Reset Bit
0 : Don’t Care
1 : Self clearing software reset
D6–D0
W
0000000
Reserved; don’t write
35
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