ADAS1000 datasheet(49/80 Pages) AD

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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

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

SDO

DRDY (OPTIONAL)

SCLK

SDI

CS2

SDO

CS1

SLAVE

SCLK

SDI

SDO

DRDY (OPTIONAL)

MICROCRONTROLLER/

DSP

Rev. B | Page 49 of 80

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