MAX44000 Maxim, MAX44000 Datasheet - Page 16

• Manufacturer Part Number: MAX44000
• Description: MAX44000 combines a wide-dynamic range ambient light sensor with an integrated infrared proximity sensor, making it a perfect solution for touch-screen portable devices
• Manufacturer: Maxim

Note: Values read from TRIM_GAIN_ registers are the complements of the written value. This is true for reading both the factory-
programmed values and the customer-programmed values.
Ambient and Infrared Proximity Sensor
The value set by PRXTHR[7:0] in combination with the ABOVE bit controls the operation of the proximity interrupt func-
tion. If the ABOVE bit is set to 1, the proximity interrupt has been enabled (PRXINTE = 1), and the result of a proximity
measurement is greater than the value stored in PRXTHR[7:0], then a proximity interrupt event is recorded. The inter-
rupt bit is set subject to count conditions set by PRXPST[1:0]. Similarly, if the ABOVE bit is set to 0, then an interrupt
event is recorded if the result of a proximity measurement is less than value stored in PRXTHR[7:0].
TRIM_GAIN_GREEN[6:0] is used to modify the gain of the green channel.
TRIM_GAIN_IR[8:0] is used to modify the gain of the IR channel.
To tell the part to use the values written to this register, set the TRIM bit to 0 in the Main Configuration register after
writing new values to these registers.
PROX Threshold Indicator
PROX Threshold
16
Digital Gain Trim of
Green Channel
Digital Gain Trim of
Infrared Channel
_____________________________________________________________________________________
REGISTER
REGISTER
B7
B7
B6
ABOVE
B6
TRIM_GAIN_GREEN[6:0]
B5
TRIM_GAIN_IR[8:1]
B5
B4
PRXTHR[7:0]
B4
B3
B3
Proximity Threshold Registers (0x0B, 0x0C)
B2
B2
Digital Gain Trim Registers (0x0F, 0x10)
B1
B1
GAIN_
TRIM_
IR[0]
B0
B0
REGISTER
ADDRESS
REGISTER
ADDRESS
0x0F
0x10
0x0C
0x0B
POWER-ON
POWER-ON
RESET
STATE
RESET
STATE
0x80
0x80
0x00
0x00
R/TW
R/TW
R/W
R/W
R/W
R/W