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ADAS1000 Datasheet(PDF) 49 Page - Analog Devices |
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ADAS1000 Datasheet(HTML) 49 Page - Analog Devices |
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49 / 80 page  Data Sheet ADAS1000/ADAS1000-1/ADAS1000-2 INTERFACING IN GANG MODE As shown in Figure 77, when using multiple devices, the user must collect the ECG data directly from each device. The example shown in Figure 78 illustrates one possibility of how to approach interfacing to a master and slave device. Note that SCLK, SDO, and SDI are shared here with individual CS lines. This requires the user to read the data on both devices twice as fast to ensure that they can capture all the data to maintain the chosen data rate and ensure they have the relevant synchronized data. Alternative methods might use individual controllers for each device or separate SDO paths. For some applications, digital isolation is required between the host and the ADAS1000. The example shown illustrates a means to ensure that the number of lines requiring isolation is minimized. Table 17. Some Possible Arrangements for Gang Operation Master Slave 1 Slave 2 Features Number of Electrodes Number of Leads ADAS1000 ADAS1000-2 ECG, respiration, pace 10 ECG, CM_IN, RLD 12-lead + spare ADC channel ADAS1000 ADAS1000-2 ADAS1000-2 ECG, respiration, pace 15 ECG, CM_IN, RLD 15-lead + 3 spare ADC channels ADAS1000 ADAS1000-3 ECG, respiration, pace 8 ECG, CM_IN, RLD 12-lead (derived leads) ADAS1000-1 ADAS1000-2 ECG 10 ECG, CM_IN, RLD 12-lead + spare ADC channel ADAS1000-3 ADAS1000-2 ECG 8 ECG, CM_IN, RLD 12-lead (derived leads) ADAS1000-4 ADAS1000-2 ECG, respiration, pace 8 ECG, CM_IN, RLD 12-lead (derived leads) Figure 78. One Method of Interfacing to Multiple Devices MASTER SCLK SDI CS SDO DRDY (OPTIONAL) SCLK SDI CS2 SDO CS1 SLAVE SCLK SDI CS SDO DRDY (OPTIONAL) MICROCRONTROLLER/ DSP Rev. B | Page 49 of 80 |
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