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Table 4. Format of Received Samples—WSpO
2
in
Calibration/Algorithm Mode
DATA SOURCE
BYTE
INDEX DATA ITEM
NUMBER OF
BYTES
(MSB FIRST)
DESCRIPTION
MAX86141
PPG Data
(18 Bytes)
0 LED1 3 N/A
3 LED2 3 N/A
6 LED3 3 N/A
9 LED4 3 Red LED counter
12 LED5 3 IR LED counter
15 LED6 3 N/A
Accelerometer
(6 Bytes)
18 accelX 2 Two's complement. LSB = 0.001g
20 accelY 2 Two's complement. LSB = 0.001g
22 accelZ 2 Two's complement. LSB = 0.001g
SpO
2
Algorithm
(9 Bytes)
24 R 2 10x calculated R value
26 Confidence 1 Calculated confidence in %
27 SpO
2
2 10x SpO
2
%
29 % complete 1
Calculation progress in % (only in
one-shot mode of algorithm)
30
Low SNR
flag
1 Shows low SNR in measurement
31 Motion flag 1 Shows excessive motion
32 Status 1
Reported status of algorithm:
LED adjustment: 0
Computation: 1
Success: 2
Timeout: 3