APDS-9801 Avago Technologies US Inc., APDS-9801 Datasheet - Page 12

• 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

PS – APPLICATION SOFTWARE
Configuration the registers
The Pulse_Freq register and Interval Delay and Control register are initialized to default values when power up. Setting
these registers to desired values would be part of setup procedure. The value can be change to optimize the perfor-
mance need. Below are samples code illustrates the setting of registers for various option.
Set up Pulse_Freq
Set up Interval Delay and LED Current Control
Enable Measurement
12
//20 pulses, 25% Duty Cycle and 100kHz Pulse Frequency
DeviceAddr = 0x55
Command = 0x81
Value = 0x86
WriteByte_i2c(DeviceAddr, Command, Value)
//24 pulses, 50% Duty Cycle and 100kHz Pulse Frequency
DeviceAddr = 0x55
Command = 0x81
Value = 0x8E
WriteByte_i2c(DeviceAddr, Command, Value)
//100mA of LED current and 5ms interval delay between the burst pulses
DeviceAddr = 0x55
Command = 0x82
Value = 0x08
WriteByte_i2c(DeviceAddr, Command, Value)
//150mA of LED current and 250ms interval delay between the burst pulses
DeviceAddr = 0x55
Command = 0x82
Value = 0x1C
WriteByte_i2c(DeviceAddr, Command, Value)
DeviceAddr = 0x55
Command = 0x82
ReadByte_i2c(DeviceAddr, Command, & Value)
Value |= 0x20
WriteByte_i2c(DeviceAddr, Command, Value)
//Slave address also be –or 0x55
//Set Command bit and address of Pulse_Freq
//Slave address also be – 0x55
//Set Command bit and address of register
//Read back register value
//Set Enable Measurement bit