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TAS2564 Datasheet(PDF) 39 Page - Texas Instruments |
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TAS2564 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 118 page  Temp Sensor SAR ADC VBAT Limiter & Brown Out Prevention AUDIO_IN AUDIO_OUT SETTINGS 39 TAS2564 www.ti.com SLASEI6A – OCTOBER 2019 – REVISED DECEMBER 2019 Product Folder Links: TAS2564 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated The TAS2564 also employs a Brown Out Prevention (BOP) feature that serves as a low latency priority input to the limiter engine that begins attacking the VBAT supply dipping below the programmed BOP threshold. This feature can be enabled by setting the BOP_EN register bit high. It should be noted that the BOP feature is independent of the limiter and will function if enabled, even if the limiter is disabled. The BOP threshold is configured by setting the threshold with register bits BOP_TH. Figure 41. Limiter Block Diagram Table 62. Brown Out Prevention Enable BOP_EN VALUE 0 Disabled 1 Enabled (default) The Brownout prevention threshold BOP_TH represent a threshold in a 4.X format. To calculate the value to write to the 4 registers by apply the following formula to the desired brownout threshold using equation BOP_TH = round(Volts*2^28). Table 63. Brown Out Prevention Threshold BOP_TH[31:0] VBAT THRESHOLD (V) 0x0000 000 - 0x1FFF FFFF Reserved 0x2000 0000 2.5 ... ... 0x2E66 6666 2.9 (default) ... ... 0x2000 0000 4 0x2000 0001 - 0xFFFF FFFF Reserved The BOP feature has a separate attack rate BOP_ATK_RT, attack step size BOP_ATK_ST and hold time BOP_HLD_TM from the battery tracking limiter. The BOP feature uses the LIMB_RLS_RT register setting to release after a brown out event. The rates are based on the number of audio samples and actual time values can be calculated by multiplying by 1/fs. For example the attack rate of 4 samples at 48 ksps would be approximately 83 µs. Table 64. Brown Out Prevention Attack Rate BOP_ATK_RT[2:0] ATTACK RATE (samples/step) ATTACK RATE @ 48 ksps (~µs) 0x0 1 20 0x1 2 42 0x2 4 83 0x3 8 167 0x4 16 333 0x5 32 666 |
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