MAX32664: How use Skin Contact Detection (SCD) features?

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HOST COMMAND (HEX)

COMMAND DESCRIPTION

RESPONSE (HEX)

1.6

AA 52 02 02*

    Enable WHRM Algorithm

AB 00

Data Item

Size (Bytes)

Description

HR

2

Heart Rate (bpm). LSB = 0.1 bpm

HR Confidence

1

Confidence level (0 - 100%). LSB = 1%

RR

2

RR value. LSB = 0.1

Activity Class

1

0: Rest;
1: Other Non-Rhythmic Activity;
2: Walking;
3: Running;
4: Biking;
5: Other Rhythmic Activity

RR Confidence Level

1

RR Confidence level (0 - 100%). LSB = 1%

Total Walk Steps

4

Total Walk Steps (MSB first)

Total Run Steps

4

Total Run Steps (MSB first)

Total Energy in kcal

4

Total Energy in kcal (MSB first)

Rhythmic Step Cadence

4

Rhythmic Step Cadence (MSB first)

LED Current Adjustment flag

1

LED Current Adjustment flag.
0 - No adjustment
1 - Adjustment requested

Adjusted LED Current value

2

Adjusted LED Current in mA. LSB = 0.1 mA

TINT (Time Integration) Adjustment flag

1

TINT (Time Integration) Adjustment flag
0 - No adjustment
1 - Adjustment requested

Adjusted TINT value

2

Adjusted TINT value in us. LSB = 0.1 us

Sample Rate Adjustment flag

1

Sample Rate Adjustment flag
0 - No adjustment
1 - Adjustment requested

Adjusted Sample Rate

1

Adjusted Sample Rate : 25 or 100 Hz

Adjusted Sample Average

1

Adjusted Sample Average: 1 or 4

AEC state

1

AEC state:
3  - Algorithm waiting for adjustment
4 - Algorithm is in AGC mode
5 – AEC internal mode
6 – AEC updates target PD current from default 10mA to min=3mA (configurable).

High Motion flag

1

High Motion flag:
0 - No motion
1 - High motion

SCD Status

1

SCD Status:
0 - On Skin
1 - Off Skin