ADAS1000-4BSTZ datasheet(76/80 Pages) AD

76 / 80 page

ADAS1000-3/ADAS1000-4

Data Sheet

100B

Example 6: Writing to Master and Slave Devices and Streaming Conversion Data

This example uses the ADAS1000-3 as the slave device and the

ADAS1000 as the master device to achieve a configuration with

eight input electrodes and one right leg drive.

101B101B

Slave Configuration (ADAS1000-3)

1. Write 1 configures the FRMCTL register to output five

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

consists of the header, three ECG words, and lead-off. The

frame is configured to always send, irrespective of ready

status. The slave ADAS1000-3 is in electrode mode format

with a data rate of 2 kHz.

2. Write 2 configures the CMREFCTL register to receive an

external common mode from the master.

3. Write 3 addresses the ECGCTL register, enabling all

channels into a gain of 1.4, low noise mode. It configures

the device as a slave, in gang mode and driven from the

CLK_IN input source (derived from master ADAS1000).

The ADAS1000-3 slave is also put into conversion mode

in this write, but waits for the SYNC_GANG signal from

the master device before it starts converting.

102B102B

Master Configuration (ADAS1000)

•

Write 4 configures the FRMCTL register to output seven

words per frame/packet (note that this differs from the

number of words in a frame available from the slave

device). The frame/packet of words consists of the header,

five ECG words, pace, respiration magnitude, and lead-off.

In this example, the frame is configured to always send

irrespective of ready status. The master, ADAS1000, is in

vector mode format with a data rate of 2 kHz. Similar

to the slave device, the master could be configured for

electrode mode; the host controller would then be required

to make the lead calculations.

1. Write 5 configures the CMREFCTL register for CM =

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

RLD_OUT electrode. The shield amplifier is enabled.

The CM = WCT signal is driven out of the master device

(CM_OUT) into the slave device (CM_IN).

2. Write 6 addresses the ECGCTL register, enabling all

channels into a gain of 1.4, low noise mode. It configures

the device as a master in gang mode and driven from

the XTAL input source. The ADAS1000 master is set to

differential input, which places it in analog lead mode.

This ECGCTL register write puts the master into

conversion mode, where the device sends an edge on

the SYNC_GANG pin to the slave device to trigger the

simultaneous conversions of both devices.

3. Write 7 issues the read command to both devices to start

putting the converted and decimated data out on the

respective SDO pins.

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

at the configured packet data rate.

Table 60. Example 6: Writing to Master and Slave Devices and Streaming Conversion Data

Device

Write Command

R/W

Data

32-Bit Write Command

Slave

Write 1

FRMCTL

000 1010

0001 1111 1111 0110 0001 0000

0x8A1FF610

Write 2

CMREFCTL

000 0101

0000 0000 0000 0000 0000 0100

0x85000004

Write 3

ECGCTL

000 0001

1110 0000 0000 0000 1101 1110

0x81E000DE

Master

Write 4

FRMCTL

000 1010

0001 1111 1001 0110 0000 0000

0x8A1F9600

Write 5

CMREFCTL

000 0101

1110 0000 0000 0000 0000 1011

0x85E0000B

Write 6

ECGCTL

000 0001

1110 0000 0000 0100 1011 1110

0x81E004BE

Master

and

Slave

Write 7

FRAMES

100 0000

0000 0000 0000 0000 0000 0000

0x40000000

Rev. B | Page 76 of 80

ADAS1000-4BSTZ 数据表(PDF) 76 Page - Analog Devices

ADAS1000-4BSTZ 数据表(HTML) 76 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

数据表下载