Datasheet

Whenever an interrupt is triggered, the MAX30101 pulls the active-low interrupt pin into its low state until the interrupt is

cleared.

A_FULL: FIFO Almost Full Flag

In SpO

and HR modes, this interrupt triggers when the FIFO write pointer has a certain number of free spaces remaining.

The trigger number can be set by the FIFO_A_FULL[3:0] register. The interrupt is cleared by reading the Interrupt Status

1 register (0x00).

PPG_RDY: New FIFO Data Ready

In SpO

and HR modes, this interrupt triggers when there is a new sample in the data FIFO. The interrupt is cleared by

reading the Interrupt Status 1 register (0x00), or by reading the FIFO_DATA register.

ALC_OVF: Ambient Light Cancellation Overow

This interrupt triggers when the ambient light cancellation function of the SpO

/HR photodiode has reached its maximum

limit, and therefore, ambient light is affecting the output of the ADC. The interrupt is cleared by reading the Interrupt

Status 1 register (0x00).

PWR_RDY: Power Ready Flag

On power-up or after a brownout condition, when the supply voltage V

transitions from below the undervoltage lockout

(UVLO) voltage to above the UVLO voltage, a power-ready interrupt is triggered to signal that the module is powered-up

and ready to collect data.

DIE_TEMP_RDY: Internal Temperature Ready Flag

When an internal die temperature conversion is finished, this interrupt is triggered so the processor can read the

temperature data registers. The interrupt is cleared by reading either the Interrupt Status 2 register (0x01) or the TFRAC

Interrupt Status (0x00–0x01)

REG

ADDR

POR

STATE

R/W

Interrupt

Status 1

A_FULL PPG_RDY ALC_OVF

PWR_

RDY

0x00 0X00 R

Interrupt

Status 2

DIE_

TEMP_RDY

0x01 0x00 R

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MAX30101 High-Sensitivity Pulse Oximeter and

Heart-Rate Sensor for Wearable Health