ADAS1000-4BSTZ datasheet(56/80 Pages) AD

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ADAS1000-3/ADAS1000-4

Data Sheet

Rev. B | Page 56 of 80

SPI OUTPUT FRAME STRUCTURE (ECG AND STATUS DATA)

Three data rates are offered for reading ECG data: low speed 2 kHz/16 kHz rates for electrode/lead data (32-bit words) and a high speed

128 kHz for electrode/lead data (16-bit words).

Figure 79. Output Frame Structure for 2 kHz and 16 kHz Data Rates with SDO Data Configured for Electrode or Lead Data

Figure 80. Output Frame Structure for 128 kHz Data Rate with SDO Data Configured for Electrode Data

(The 128 kHz Data Rate Can Provide Single-Ended Electrode Data or Analog Lead Mode Data Only. Digital Lead Mode Is Not Available at 128 kHz Data Rate.)

CS1

SCLK

SDO2

DRDY

1 CS MAY BE USED IN ONE OF THE FOLLOWING WAYS:

A) HELD LOW ALL THE TIME.

B) USED TO FRAME THE ENTIRE PACKET OF DATA.

C) USED TO FRAME EACH INDIVIDUAL 32-BIT WORD.

2 FULL WORD COUNT = 10 (RESPIRATION PHASE EXCLUDED HERE). WORDS MAY BE EXCLUDED, SEE THE FRMCTL REGISTER.

32-BIT

DATA WORDS

DRIVEN OUTPUT DATA STREAM

EACH SCLK WORD IS 32 CLOCK CYCLES

ANOTHER FRAME OF DATA

CS1

SCLK

SDO2

DRDY

911

DRIVEN OUTPUT DATA STREAM

ANOTHER FRAME

EACH SCLK WORD IS 16 CLOCK CYCLES

16-BIT

DATA WORDS

1 CS MAY BE USED IN ONE OF THE FOLLOWING WAYS:

A) HELD LOW ALL THE TIME.

B) USED TO FRAME THE ENTIRE PACKET OF DATA.

C) USED TO FRAME EACH INDIVIDUAL 16-BIT WORD.

2 FULL WORD COUNT = 13 (RESPIRATION PHASE EXCLUDED HERE). WORDS MAY BE EXCLUDED, SEE THE FRMCTL REGISTER.

ADAS1000-4BSTZ 数据表(PDF) 56 Page - Analog Devices

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