ADAS1000-4BSTZ datasheet(74/80 Pages) AD

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ADAS1000-3/ADAS1000-4

Data Sheet

50B

INTERFACE EXAMPLES

The following examples show register commands required

to configure the ADAS1000-3/ADAS1000-4 devices into

particular modes of operation and to start framing ECG data.

95B

Example 1: Initialize the Device 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 seven

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

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

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

always send, irrespective of ready status. The device

is in analog lead 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 device 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

should 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

configuration data and will stop the ADC conversions

to allow the interface to process the new command.

96B

Example 2: Enable Respiration and Stream Conversion

Data (Applies to ADAS1000-4 Only)

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.

97B

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 55. Example 1: Initialize the Device 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

0001 1111 1001 0110 0000 0000

0x8A1F9600

Write 3

ECGCTL

000 0001

1110 0000 0000 0100 1010 1110

0x81E004AE

Write 4

FRAMES

100 0000

0000 0000 0000 0000 0000 0000

0x40000000

Table 56. Example 2: Enable Respiration and Stream Conversion Data (Applies to ADAS1000-4 Only)

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 57. 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

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