Maxim Integrated
Page 7 of 52
PART NUMBER
APPLICATION ALGORITHM/FIRMWARE
BOOTLOADER
KEY
MAXIM REFERENCE
DESIGN
MAX32664GWEC
The Wearable Heart-Rate Monitoring (WHRM)
algorithm (25Hz sampling). The WHRM algorithm is
configured to use LED1 (Green) and Photodiode 1
or/and 2, and it is compatible with the sensor hub
combination of the MAX32664GWEB, MAX86141
AFE, and KX-122 accelerometer. It is mandatory to
use accelerometer the KX-122 accelerometer or
external accelerometer data with the WHRM
algorithm to detect and compensate motion. If the
KX-122 accelerometer is not connected to
MAX32664 then the external accelerometer data
should be supplied at the 25Hz sampling rate.
The Automatic Exposure Control and Skin Control
Detection (AEC-SCD) of WHRM (AEC-SCD is included
in the WHRM algorithm). If AEC-SCD is enabled, the
LED current, pulse width and sample rate are
automatically determined by the algorithm. If AEC-
SCD is not enabled, the LED current, LED current
range, pulse width, and ADC range registers should
be configured by the host software.
The Wearable Oxygen Saturation (WSpO2)
algorithm (25Hz sampling). The WSpO2 algorithm is
configured to use LED2 (IR) and LED3 (Red) and
Phot-
diode 1 or 2, and it’s compatible with the
sensor hub combination of the MAX32664GWEB,
MAX86141 AFE, and KX-122 accelerometer. It is
mandatory to use an accelerometer with the
WSpO2 algorithm to detect motion. If the KX-122
accelerometer is not connected to MAX32664
external accelerometer data should be supplied,
then external accelerometer should use the 25Hz
sampling rate.
The Automatic Gain Control (AGC) of WSpO2. If AGC
is enabled, the LED currents and ADC range are
automatically determined by the algorithm. If the
AGC is not enabled, the LED currents, pulse width
and ADC range registers should be configured by the
host software.
C
MAXREFDES101
with
SpO2 LED Board