Detailed Description
The MAX32664 is a sensor hub family with embedded
firmware and algorithms for wearables. It seamlessly
enables customer-desired sensor functionality, including
communication with Maxim’s optical sensor solutions and
delivering raw or calculated data to the outside world. This
is achieved while keeping overall system power consump-
tion in check.
The MAX32664 Version A supports the MAX30101/
MAX30102 high-sensitivity pulse oximeter and heart-rate
sensor for wearable health for finger-based applications.
The sensor hub interface provides an fast-mode I
2
C slave
interface to transmit commands and data to a microcon-
troller host. A second I
2
C interface is dedicated to com-
munication with sensors.
The sampling of the sensors is derived from the 32.768kHz
real-time clock. The sampling rate is user-configurable to
minimize power consumption.
Algorithmic Processing
Finger Heart Rate Algorithms
The MAX32664 Version A performs finger-based heart
rate and blood oxygen saturation (SpO2) monitoring.
The embedded algorithm uses digital filtering, pressure/
position compensation, advanced R-wave detection, and
automatic gain control to determine the heart rate in
beats per minute while minimizing power. Also, the Maxim
Integrated sensor hardware has built-in ambient light
rejection to minimize background noise. SpO2 results are
reported as percentage of hemoglobin that is saturated
with oxygen. The calibration values for SpO2 configuration
should be performed while using the end product.
BUMP NAME FUNCTION
I
2
C
D1 SLAVE_SCL
Slave SCL. This is the I
2
C slave SCL that should be connected to the host microprocessor I
2
C master
SCL.
D2 SLAVE_SDA Slave SDA. This is the I
2
C slave SDA that should be connected to the host microprocessor I
2
C master SDA.
B4 SENSOR_SCL Sensor SCL. This is the I
2
C master SCL that should be connected to the I
2
C slave SCL on the slave sensors.
B3 SENSOR_SDA Sensor SDA. This is the I
2
C master SDA that should be connected to the I
2
C slave SDA on the slave sensors.
INTERRUPTS
C4 HR_INT Heart Rate Monitor Interrupt Input. This pin connects to the heart rate monitor sensor interrupt output.
C3 ACCEL_INT Accelerometer Interrupt Input. This pin connects to the accelerometer sensor interrupt output.
C2 MFIO
Multifunction IO. This pin provides dierent functions: MFIO asserts low as an output when the sensor
hub needs to communicate with the host controller; the pin acts as an input and causes the sensor hub to
enter bootloader mode if the MFIO pin is low during a reset.
DO NOT CONNECT
C1, D3,
D4
D.N.C. Do Not Connect. Internally connected. Do not make any electrical connection, including V
SS
, to these pins.
Pin Description (continued)
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7
MAX32664 Ultra-Low Power
Biometric Sensor Hub
