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TAS5441-Q1 Arkusz danych(PDF) 16 Page - Texas Instruments

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Numer części TAS5441-Q1
Szczegółowy opis  TAS5441-Q1 22-W Analog Input 1-Channel Automotive Class-D Audio Amplifier with Load Dump and I2C Diagnostics
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

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TAS5441-Q1
SLOSE41 – APRIL 2020
www.ti.com
Product Folder Links: TAS5441-Q1
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Copyright © 2020, Texas Instruments Incorporated
(1)
See SLOA264 for I2C applications.
7.4 Device Functional Modes
7.4.1 Hardware Control Pins
Three discrete hardware pins are available for real-time control and indication of device status.
1. FAULT pin: This active-low open-drain output pin indicates the presence of a fault condition which requires
the device to go into the Hi-Z mode. On assertion of this pin, the device has protected itself and the system
from potential damage. The system can read the exact nature of the fault via I2C with the exception of PVDD
undervoltage faults below POR, in which case the I2C bus is no longer operational.
2. STANDBY pin: Assertion of this active-low pin sends the device into a complete shutdown, limiting the
current draw. Load-dump protection is supported and I2C is non-blocking, but inactive.
3. MUTE pin: On assertion of this active-high pin, the device is in mute mode. The output pins stop switching
and audio does not pass from the input to the output. To place the device back into play mode, deassert this
pin. The MUTE pin should be asserted low when the device is in STANDBY.
7.4.2 EMI Considerations
Automotive-level EMI performance depends on both careful integrated-circuit design and good system-level
design. Controlling sources of electromagnetic interference (EMI) was a major consideration in all aspects of the
design.
The design has minimal parasitic inductances due to the short leads on the package, which dramatically reduces
the EMI that results from current passing from the die to the system PCB. The design incorporates circuitry that
optimizes output transitions that cause EMI.
7.4.3 Operating Modes and Faults
The following tables list operating modes and faults.
Table 2. Operating Modes
STATE NAME
OUTPUT
OSCILLATOR
I2C (1)
STANDBY
Hi-Z, floating
Stopped
Inactive, Non-blocking
Load diagnostic
DC biased
Active
Active
Fault and mute
Hi-Z, floating
Active
Active
Play
Switching with audio
Active
Active
(1)
Tested in accordance with ISO7637-1
Table 3. Faults and Actions
FAULT
EVENT
FAULT EVENT
CATEGORY
MONITORING
MODES
REPORTING
METHOD
ACTION
TYPE
ACTION
RESULT
CLEARING
POR
Voltage fault
Play,
Mute,STANDBY
Not applicable
Hard mute (no ramp)
Standby
Self-clearing
UV or OV
I2C + FAULT pin
Hi-Z
Load dump(1)
FAULT pin
OTSD
Thermal fault
Hi-Z, Mute, Play
I2C + FAULT pin
OC fault
Output channel
fault
Play
DC detect
Load diagnostic -
short
Diagnostic
Hi-Z
None
Hi-Z, re-run
diagnostics
Load diagnostic -
open
I2C
None
Clears on next
diagnostic
cycle


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