APDS-9801 Avago Technologies US Inc., APDS-9801 Datasheet - Page 11

• Manufacturer Part Number: APDS-9801
• Description: INTEGRATED DIGITAL PS AND ALS
• Manufacturer: Avago Technologies US Inc.
• Type: Analog Ambient Light Sensor and Digital Proximity Sensorr

Specifications of APDS-9801

• Peak Wavelength: 940 nm
• Maximum Light Current: 83 uA
• Maximum Dark Current: 300 nA
• Maximum Rise Time: 1000 ns
• Maximum Fall Time: 300 ns
• Mounting Style: SMD/SMT
• Product: Integrated Ambient Light and Proximity Sensor
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Note 1: Figure 3 Definition of transmit burst pulses
Duty cycle = t/Pclk
Delay
Note 2: Interrupt Status Implementation
The following diagram explained how the positive threshold interrupt status and negative threshold interrupt status is
implemented. ADC Data and Interrupt threshold is compared. The output is high or low depends on the comparison
result. The detection of rising edge of the comparator set the positive threshold interrupt status bit to ‘1’ . The detection
of falling edge of the comparator set the negative threshold interrupt status bit to ‘1’ .
Comparator output waveform:
11
Interrupt Threshold
If rising edge is detected, Positive
Threshold interrupt status bit is set to ‘1’.
After reading the status bit, write ‘1’
to bit 6 of the command register to
clear the status. Wait for another
interrupt status assert.
‘1’ if ADC Data > Interrupt Threshold
Pclk
ADC Data
= the time between the last burst pulse to the first burst pulse of the next burst
t
N x pulses
+

1
st
burst
Comparator Output
‘0’ if ADC Data < Interrupt Threshold
If falling edge is detected, Negative
Threshold interrupt status bit is set to ‘1’.
After reading the status bit, write ‘1’
to bit 6 of the command register to
clear the status. Wait for another
interrupt status assert.
Delay
2
nd
burst