The purpose of PILOT_PA[7:0] is to set the LED power during the proximity mode, as well as in Multi-LED mode.

Multi-LED Mode Control Registers (0x11–0x12)

In multi-LED mode, each sample is split into up to four time slots, SLOT1 through SLOT4. These control registers determine

which LED is active in each time slot, making for a very flexible configuration.

Each slot generates a 3-byte output into the FIFO. One sample comprises all active slots, for example if SLOT1 and

SLOT2 are non-zero, then one sample is 2 x 3 = 6 bytes.

The slots should be enabled in order (i.e., SLOT1 should not be disabled if SLOT2 is enabled).

Table 9. Multi-LED Mode Control Registers

REGISTER

B7

B6

B5

B4

B3

B2

B1

B0

REG

ADDR

POR

STATE R/W

Multi-LED

Mode Control

Registers

SLOT2[2:0]

SLOT1[2:0]

0x11

0x00

R/W

SLOT4[2:0]

SLOT3[2:0]

0x12

0x00

R/W

SLOTx[2:0] Setting

WHICH LED IS ACTIVE

LED PULSE AMPLITUDE SETTING

000

None (time slot is disabled)

N/A (Off)

001

LED1 (Red)

LED1_PA[7:0]

010

LED2 (IR)

LED2_PA[7:0]

011

None

N/A (Off)

100

None

N/A (Off)

101

LED1 (Red)

PILOT_PA[7:0]

110

LED2 (IR)

PILOT_PA[7:0]

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MAX30102

High-Sensitivity Pulse Oximeter and

Heart-Rate Sensor for Wearable Health