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TDA5345HT Datasheet(PDF) 17 Page - NXP Semiconductors |
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TDA5345HT Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 44 page  1999 June 10 17 Philips Semiconductors Preliminary specification 5 V spindle & VCM driver combo TDA5345HT Table 5 Numeral application with CLOCK = 16 MHz TIMER 2 TIMER2 is used to measure the delay between two zero-crossings and also to set the maximum commutation delay through comdelim delay: Explanation: COMDELIM is the maximum value that can be reached by TIMER 2. So, this is the maximum delay between 2 zero-crossings. The maximum commutation delay is then half this value! Calculations: Delay between 2 zero-crossings ( ∆ Zc): step size = 2LSB / ClockOutPrescaler min = (2LSB-1) / ClockOutPrescaler (bits from 0 to (LSB-1) are internally set to 1) maximum = (2(MSB+1) - 1) / ClockOutPrescaler Maximum commutation delay: step size = 2(LSB-1) / ClockOutPrescaler maximum = (2(MSB) - 1) / ClockOutPrescaler Table 6 Numeral application with CLOCK = 16 MHz DELAYS CLOCKOUTPRESCALER= CLOCK/4 = 4 MHZ CLOCKOUTPRESCALER= CLOCK/8 = 2 MHZ CLOCKOUTPRESCALER= CLOCK/16 = 1 MHZ CLOCKOUTPRESCALER= CLOCK/32 = 0.5 MHZ MIN STEP MAX MIN STEP MAX MIN STEP MAX MIN STEP MAX Blank 3 µs 4 µs 63 µs 7 µs 8 µs 127 µs 15 µs 16 µs 255 µs 31 µs 32 µs 511 µs WatchDog 127 µs 128 µs 2.05 ms 255 µs 256 µs 4.0 ms 511 µs 512 µs 8.2 ms 1023 µs 1024 µs 16.4 ms StartUp 4.1 ms 65.5 ms 65.5 ms 8.2 ms 8.2 ms 131 ms 16.4 ms 16.4 ms 262 ms 32.8 ms 32.8 ms 524 ms DELAYS CLOCKOUTPRESCALER= CLOCK/4 = 4 MHZ CLOCKOUTPRESCALER= CLOCK/8 = 2 MHZ CLOCKOUTPRESCALER= CLOCK/16 = 1 MHZ CLOCKOUTPRESCALER= CLOCK/32 = 0.5 MHZ MIN STEP MAX MIN STEP MAX MIN STEP MAX MIN STEP MAX ∆ ZC 63 µs 64 µs 1.02 ms 127 µs 128 µs 2.05 µs 255 µs 256 µs 4.1 ms 511 µs 512 µs 8.2 ms ComDeLim 31 µs 32 µs 511 ms 63 µs 64 µs 1.02 ms 127 µs 128 µs 2.05 ms 255 µs 256 µs 4.1 ms Fig.10 Timer 2 configuration. 0 1 2 3 4 5 6 7 8 9 10 11 ComDeLim |
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