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ADAS1000/ADAS1000-1/ADAS1000-2

Data Sheet

EXAMPLES OF INTERFACING TO THE ADAS1000

The following examples shows register commands required to

configure the ADAS1000 device into particular modes of

operation and to start framing ECG data.

Example 1: Initialize the ADAS1000 for ECG Capture and

Start Streaming Data

1. Write 1 configures the CMREFCTL register for CM =

WCT = (LA + LL + RA)/3; RLD is enabled onto the

RLD_OUT electrode. The shield amplifier is enabled.

2. Write 2 configures the FRMCTL register to output nine

words per frame/packet. The frame/packet of words

consist of the header, five ECG words, pace, respiration

magnitude, and lead-off. The frame is configured to

always send, irrespective of ready status. The ADAS1000

is in analog lead format mode with a data rate of 2 kHz.

3. Write 3 addresses the ECGCTL register, enabling all

channels into a gain of 1.4, low noise mode, and differen-

tial input, which configures the device for analog lead

mode. This register also configures the device as a master,

using the external crystal as the input source to the XTALx

pins. The ADAS1000 is also put into conversion mode in

this write.

4. Write 4 issues the read command to start putting the

converted data out on the SDO pin.

5. Continue to issue SCLK cycles to read the converted data

at the configured packet data rate (2 kHz). The SDI input

must be held low when reading back the conversion data

because any commands issued to the interface during read

of frame/packet are understood to be a change of configu-

ration data and stop the ADC conversions to allow the

interface to process the new command.

Example 2: Enable Respiration and Stream Conversion

Data

1. Write 1 configures the RESPCTL register with a 56 kHz

respiration drive signal, gain = 1, driving out through

the respiration capacitors and measuring on Lead I.

2. Write 2 issues the read command to start putting the

converted data out on the SDO pin.

3. Continue to issue SCLK cycles to read the converted data

at the configured packet data rate.

4. Note that this example assumes that the FRMCTL register

has already been configured such that the respiration

magnitude is available in the data frame, as arranged in

Write 2 of Example 1.

Example 3: DC Lead-Off and Stream Conversion Data

1. Write 1 configures the LOFFCTL register with a dc lead-off

enabled for a lead-off current of 50 nA.

2. Write 2 issues the read command to start putting the

converted data out on the SDO pin.

3. Continue to issue SCLK cycles to read the converted

data at the configured packet data rate.

4. Note that this example assumes that the FRMCTL register

has already been configured such that the dc lead-off word

is available in the data frame, as arranged in Write 2 of

Example 1.

Table 56. Example 1: Initialize the ADAS1000 for ECG Capture and Start Streaming Data

Write Command

Read/Write Bit

Data

32-Bit Write Command

Write 1

CMREFCTL

000 0101

1110 0000 0000 0000 0000 1011

0x85E0000B

Write 2

FRMCTL

000 1010

0000 0111 1001 0110 0000 0000

0x8A079600

Write 3

ECGCTL

000 0001

1111 1000 0000 0100 1010 1110

0x81F804AE

Write 4

FRAMES

100 0000

0000 0000 0000 0000 0000 0000

0x40000000

Table 57. Example 2: Enable Respiration and Stream Conversion Data

Write Command

Read/Write Bit

Data

32-Bit Write Command

Write 1

RESPCTL

000 0011

0000 0000 0010 0000 1001 1001

0x83002099

Write 2

FRAMES

100 0000

0000 0000 0000 0000 0000 0000

0x40000000

Table 58. Example 3: Enable DC Lead-Off and Stream Conversion Data

Write Command

Read/Write Bit

Data

32-Bit Write Command

Write 1

LOFFCTL

000 0010

0000 0000 0000 0000 0001 0101

0x82000015

Write 2

FRAMES

100 0000

0000 0000 0000 0000 0000 0000

0x40000000

Rev. B | Page 74 of 80

ADAS1000BSTZ Datasheet(PDF) 74 Page - Analog Devices

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