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TAS5548 Datasheet(PDF) 35 Page - Texas Instruments |
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TAS5548 Datasheet(HTML) 35 Page - Texas Instruments |
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35 / 120 page  TAS5548 www.ti.com SLES270 – NOVEMBER 2012 5 TAS5548 Controls and Status The TAS5548 provides control and status information from both the I2C registers and device pins. This section describes some of these controls and status functions. The I2C summary and detailed register descriptions are contained in Section 10 and Section 11. 5.1 I 2C Status Registers The TAS5548 has two status registers that provide general device information. These are the general status register 0 (0x01) and the error status register (0x02). 5.1.1 General Status Register (0x01) • Device identification code 5.1.2 Error Status Register (0x02) • No internal errors (the valid signal is high) • Audio Clip indicator. Writing to the register clears the indicator. • This error status register is normally used for system development only. 5.2 TAS5548 Pin Controls The TAS5548 provide a number of terminal controls to manage the device operation. These controls are: • RESET • PDN • BKND_ERR • HP_SEL • MUTE • PSVC • EMO1 (see System Power Contoller section) • EMO2 (see System Power Contoller section) 5.2.1 Reset (RESET) The TAS5548 is placed in the reset mode either by the power-up reset circuitry when power is applied, or by setting the RESET terminal low. RESET is an asynchronous control signal that restores the TAS5548 to the hard-mute state (Non PWM Switching). Master volume is immediately set to full attenuation (there is no ramp down). Reset initiates the device reset without an MCLK input. As long as the RESET terminal is held low, the device is in the reset state. During reset, all I2C and serial data bus operations are ignored. Table 5-1 shows the device output signals while RESET is active. Table 5-1. Device Outputs During Reset SIGNAL SIGNAL STATE Valid Low PWM P-outputs Low (Non PWM Switching) PWM M-outputs Low (Non PWM Switching) SDA Signal input (not driven) Copyright © 2012, Texas Instruments Incorporated TAS5548 Controls and Status 35 Submit Documentation Feedback Product Folder Links: TAS5548 |
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