Rainbow Electronics MAX44000 User Manual

Page 16

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MAX44000

Ambient and Infrared Proximity Sensor

Proximity Threshold Registers (0x0B, 0x0C)

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].

Digital Gain Trim Registers (0x0F, 0x10)

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.

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.

ADDRESS

POWER-ON

RESET
STATE

R/W

PROX Threshold Indicator

ABOVE

0x0B

0x00

R/W

PROX Threshold

PRXTHR[7:0]

0x0C

0x00

R/W

ADDRESS

POWER-ON

RESET
STATE

R/W

Digital Gain Trim of
Green Channel

TRIM_GAIN_GREEN[6:0]

TRIM_

GAIN_

IR[0]

0x0F

0x80

R/TW

Digital Gain Trim of
Infrared Channel

TRIM_GAIN_IR[8:1]

0x10

0x80

R/TW