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ADXL180WCPZ-RL1 Arkusz danych(PDF) 16 Page - Analog Devices |
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ADXL180WCPZ-RL1 Arkusz danych(HTML) 16 Page - Analog Devices |
16 / 56 page ADXL180 Rev. 0 | Page 16 of 56 The synchronization pulse detector is reenabled after tB, which is an idle bit transmission following the last data frame bit (see the Data Frame Definition section). At this point, the device is ready to receive the next sync pulse. If the application requires or uses a pulse of nonuniform shape, such as, for example, rising above VSPT and subsequently toggling such that it falls below VSPT one or more times before tSPD, consult Analog Devices, Inc., applications support for further information on application specific pulse recognition. Note, this counter means that when an invalid length sync pulse of less than seven counts is followed less than seven counts later by a subsequent sync pulse, detection may occur when the counter is incremented further by less than seven counts by the second pulse. Bus Discharge Enable Table 8. Bus Discharge Enable BDE Definition 0 Bus discharge disabled (default). 1 Bus discharge enabled. Only active when SYEN = 1. The bus discharge enable (BDE) bit in the configuration regis- ters can be set to aid in the discharge of the bus voltage after a synchronization pulse is detected. If the BDE bit is set, the ADXL180 changes the bus current (IBUS) level from IIDLE to ISIG once a valid synchronization pulse has been detected. The control module then sets the voltage on the bus to the nominal operating level. The bus capacitance is discharged by the ADXL180 device. The current level of ISIG acts as an active pull-down current to return the VBP voltage to the nominal supply voltage. The pull-down current pulse can also be used as a handshake with the control module acting as an acknowledgement of the synchronization pulse. VSP VSPND VSPT VSPND VSPT tADC tPS tSPD tB tM … … … tSTD tSPP BUS VOLTAGE NO DETECT CASE DETECT CASE DATA FRAME TIME SYNCH DETECT/ BLANKING ADC BUSY BUS DISCHARGE CURRENT (IF BDE = 1) ADXL180 RETURN CURRENT Figure 12. Synchronization Pulse Timing (Single Device) |
Podobny numer części - ADXL180WCPZ-RL1 |
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Podobny opis - ADXL180WCPZ-RL1 |
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