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TAS5441-Q1 데이터시트(PDF) 16 Page - Texas Instruments |
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TAS5441-Q1 데이터시트(HTML) 16 Page - Texas Instruments |
16 / 28 page 16 TAS5441-Q1 SLOSE41 – APRIL 2020 www.ti.com Product Folder Links: TAS5441-Q1 Submit Documentation Feedback 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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