Datasheet

Data Sheet ADAS1000-3/ADAS1000-4
Rev. A | Page 45 of 76
INTERFACING IN GANG MODE
As shown in Figure 70, when using multiple devices, the
user must collect the ECG data directly from each device.
The example shown in Figure 71 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 ADAS1000-3/ADAS1000-4. The example
shown illustrates a means to ensure that the number of lines
requiring isolation is minimized.
Figure 71. 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
10997-031