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STA320 Datasheet(PDF) 9 Page - STMicroelectronics |
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STA320 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 37 page ![]() 9/37 STA320 5.1.4 Thermal Warning Adjustable Bypass The on-chip STA320 Power Output block provides feedback to the digital controller using inputs to the Power Control block. The TWARN input is used to indicate a thermal warning condition. When TWARN is asserted (set to 0) for a period of time greater than 400ms, the power control block will force a -3dB adjustment to the modulation limit in an attempt to eliminate the thermal warning condition. Once the thermal warning volume adjustment is applied, it remains in this state until reset. 5.1.5 hermal Warning Adjustable Bypass The on-chip STA320 Power Output block provides feedback to the digital controller using inputs to the Power Control block. The FAULT input is used to indicate a fault condition (either over-current or thermal). When FAULT is asserted (set to 0), the power control block will attempt a recovery from the fault by as- serting the tri-state output (setting it to 0 which directs the power output block to begin recovery), hold it at 0 for period of time in the range of .1ms to 1 second as defined by the Fault-Detect Recovery Constant register (FDRC registers 29-2Ah), then toggle it back to 1. This sequence is repeated as log as the fault indication exists. This feature is enabled by default but can be bypassed by setting the FDRB control bit to 1. 5.2 Configuration Register B(Address 01h) 5.2.1 Serial Data Interface Format 5.2.2 Serial Data Interface The STA320 audio serial input was designed to interface with standard digital audio components and to accept a number of serial data formats. STA320 always acts a slave when receiving audio input from stan- dard digital audio components. Serial data for two channels is provided using 3 inputs: left/right clock LRC- KI, serial clock BICKI, and serial data 1 & 2 SDI12. The SAI register (Configuration Register B - 01h, Bits D3-D0) and the SAIFB register (Configuration Reg- ister B - 01h, Bit D4) are used to specify the serial data format. The default serial data format is I2S, MSB- First. Available formats are shown in the tables and figure that follow. Table 11. Serial Data First Bit BIT R/W RST NAME DESCRIPTION 6 R/W 1 TWAB Thermal-Warning Recovery Bypass: 0 - Thermal warning Recovery enabled 1 - Thermal warning Recovery disabled BIT R/W RST NAME DESCRIPTION 7 R/W 0 FDRB Fault -Detector Recovery Bypass: 0 - Fault Detector Recovery enabled 1 - Fault Detector Recovery disabled D7 D6 D5 D4 D3 D2 D1 D0 C2IM C1IM DSCKE SAIFB SAI3 SAI2 SAI1 SAI0 100000 00 BIT R/W RST NAME DESCRIPTION 0 R/W 0 SAI0 Serial Audio Input Interface Format: Determines the interface format of the input serial digital audio interface. 1R/W 0 SAI1 2R/W 0 SAI2 3R/W 0 SAI3 SAIFB Format 0MSB-First 1LSB-First |
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