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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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ADMV1455BBCZ-R7 Folha de dados(PDF) 72 Page - Analog Devices |
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ADMV1455BBCZ-R7 Folha de dados(HTML) 72 Page - Analog Devices |
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72 / 141 page  Data Sheet ADMV1455 THEORY OF OPERATION analog.com Rev. 0 | 72 of 141 Filter State Machine The internal state machine can be used to sequence through many states, using the ADD_F4 input to advance and the ADD_F3 to reset. The state machine has several input parameters from the SPI, such as start value, stop value, step size, wrap setting, and reset. At power up, the state machine output is zero, and it can be reset to zero using either the ADD_F3 ball or Register 0x204. Set ADD_F3 to logic high to hold the state machine in reset and then bring to logic low to re-enter normal operation. Alternatively, set Register 0x204 to 0 to hold the state machine in reset and then set it back to 1 to re-enter normal operation. To ensure the state machine is well behaved, it is recommended to set the stop value greater than the start value. The step size is a 8-bit twos complement value, with a range of −128 to +127, where −128 is represented by 0x80, +127 is represented by 0x7F, and −1 is represented by 0xFF. A step size of zero is invalid. Use Register 0x205 to read back the current value of the state machine. When the wrap setting is disabled, incremental sequencing starts at zero, incrementing by the step size. If the state machine has reached the stop value, then the next state is the start value. If the step size increments to more than the stop value, then the start value is used. When the wrap setting is disabled, decremental sequencing starts at zero, then decrements by the step size. If the state machine has reached zero, then the next state is the stop value. If the step size decrements to less than zero, then the stop value is used. The start value is ignored during this sequence. When the wrap setting is enabled, incremental sequencing starts at zero, then increments by the step size. If the step size increments to more than the stop value, then the sequence rolls over and continues the remaining count from zero. The start value is ignored during this sequence. When the wrap setting is enabled, decremental sequencing starts at zero, then decrements by the step size. If the step size decre- ments to less than zero, then the sequence rolls over and continues the remaining count from the stop value. The start value is ignored during this sequence. Refer to Table 18 for the applicable registers and example state machine behavior. The sequences shown in Table 18 continue indefinitely for each rising edge on ADD_F4. Table 18. Filter State Machine Example Behavior Example Step1 Start2 Stop3 Wrap4 State Machine Sequence 1 +1 3 6 0 0, 1, 2, 3, 4, 5, 6, 3, 4, 5, 6, 3, 4, 5, 6… 2 +2 3 6 0 0, 2, 4, 6, 3, 5, 3, 5, 3, 5, 3, 5, 3, 5, 3… 3 +3 3 6 0 0, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6… 4 +4 3 6 0 0, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3… 5 −1 3 6 0 0, 6, 5, 4, 3, 2, 1, 0, 6, 5, 4, 3, 2, 1, 0… 6 −2 3 6 0 0, 6, 4, 2, 0, 6, 4, 2, 0, 6, 4, 2, 0, 6, 4… 7 −3 3 6 0 0, 6, 3, 0, 6, 3, 0, 6, 3, 0, 6, 3, 0, 6, 3… 8 −4 3 6 0 0, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2… 9 +1 3 6 1 0, 1, 2, 3, 4, 5, 6, 0, 1, 2, 3, 4, 5, 6, 0… 10 +2 3 6 1 0, 2, 4, 6, 1, 3, 5, 0, 2, 4, 6, 1, 3, 5, 0… 11 +3 3 6 1 0, 3, 6, 2, 5, 1, 4, 0, 3, 6, 2, 5, 1, 4, 0… 12 +4 3 6 1 0, 4, 1, 5, 2, 6, 3, 0, 4, 1, 5, 2, 6, 3, 0… 13 −1 3 6 1 0, 6, 5, 4, 3, 2, 1, 0, 6, 5, 4, 3, 2, 1, 0… 14 −2 3 6 1 0, 5, 3, 1, 6, 4, 2, 0, 5, 3, 1, 6, 4, 2, 0… 15 −3 3 6 1 0, 4, 1, 5, 2, 6, 3, 0, 4, 1, 5, 2, 6, 3, 0… 16 −4 3 6 1 0, 3, 6, 2, 5, 1, 4, 0, 3, 6, 2, 5, 1, 4, 0… 1 The step size is determined by Register 0x200, Bits[7:0]. 2 The start is determined by Register 0x20A, Bits[4:0]. 3 The stop is determined by Register 0x206, Bits[4:0]. 4 The wrap setting is determined by Register 0x20A, Bit 5. |
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