Datasheet

Data Sheet ADAS1000-3/ADAS1000-4
Rev. A | Page 51 of 76
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 75. Output Frame Structure for 2 kHz and 16 kHz Data Rates with SDO Data Configured for Electrode or Lead Data
Figure 76. 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.)
CS
1
SCLK
SDO
2
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
2 65473
P
A
C
E
D
E
T
E
C
T
I
O
N
L
E
A
D
I
I
I
/
R
A
L
E
A
D
I
/
L
A
L
E
A
D
I
I
/
L
L
1
H
E
A
D
E
R
R
E
S
P
I
R
A
T
I
O
N
M
A
G
N
I
T
U
D
E
G
P
I
O
98
DRIVEN OUTPUT DATA STREAM
EACH SCLK WORD IS 32 CLOCK CYCLES
ANOTHER FRAME OF DATA
C
R
C
W
O
R
D
L
E
A
D
-
O
F
F
10997-036
CS
1
SCLK
SDO
2
2 65 47 3
R
A
L
A
L
L
1
H
E
A
D
E
R
R
E
S
P
I
R
A
T
I
O
N
M
A
G
N
I
T
U
D
E
DRDY
911108
DRIVEN OUTPUT DATA STREAM
ANOTHER FRAME
EACH SCLK WORD IS 16 CLOCK CYCLES
16-BIT
DATA WORDS
P
A
C
E
G
P
I
O
C
R
C
W
O
R
D
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.
L
E
A
D
-
O
F
F
10997-037