Datasheet MAX30102 (Maxim) - 19

MAX30102 High-Sensitivity Pulse Oximeter and Heart-Rate Sensor for Wearable Health
Bits 4:2: SpO2 Sample Rate Control
These bits define the effective sampling rate with one sample consisting of one IR pulse/conversion and one Red pulse/ conversion. The sample rate and pulse width are related in that the sample rate sets an upper bound on the pulse width time. If the user selects a sample rate that is too high for the selected LED_PW setting, the highest possible sample rate is programmed instead into the register.
Table 6. SpO2 Sample Rate Control SPO2_SR[2:0] SAMPLES PER SECOND
000 50 001 100 010 200 011 400 100 800 101 1000 110 1600 111 3200 See Table 11 and Table 12 for Pulse Width vs. Sample Rate information.
Bits 1:0: LED Pulse Width Control and ADC Resolution
These bits set the LED pulse width (the IR and Red have the same pulse width), and therefore, indirectly sets the integration time of the ADC in each sample. The ADC resolution is directly related to the integration time.
Table 7. LED Pulse Width Control LED_PW[1:0] PULSE WIDTH (µs) ADC RESOLUTION (bits)
00 69 (68.95) 15 01 118 (117.78) 16 10 215 (215.44) 17 11 411 (410.75) 18 www.maximintegrated.com Maxim Integrated │ 19