Rainbow Electronics MAX44000 - Manual (Page 10)

10 _____________________________________________________________________________________
MAX44000
Ambient and Infrared Proximity Sensor
Register Description (continued)
The individual register bits are explained below. Default power-up bit states are highlighted in bold.
Interrupt Status Register (0x00)
The PWRON bit in the Interrupt Status register 0x00, if set, indicates that a power-on-reset (POR) condition has
occurred, and any user-programmed thresholds cannot be valid anymore. The ALSINTS bit in the Interrupt Status reg-
ister 0x00 indicates that an ambient light interrupt condition has occurred. The PRXINTS bit in the Interrupt Status reg-
ister 0x00 indicates that a proximity receive interrupt condition has occurred. If any of these bits is set to 1, the INT pin
is pulled low and asserted. Note: On Rev-1 of the device, the PWRON bit does not pull the INT pin low, even if set to 1.
Reading the Interrupt Status register clears the PWRON, ALSINTS, and PRXINTS bits, if set, and deasserts the INT
pin. INT is pulled high by the off-chip pullup resistor. The ALSINTS and PRXINTS bits are disabled and set to 0 if the
respective interrupt enable bits in Main Configuration register 0x01 are set to 0.
Ambient Interrupt Status (ALSINTS)
REGISTER B7 B6 B5 B4 B3 B2 B1 B0
REGISTER
ADDRESS
POWER-ON
RESET
STATE R/W
Threshold Persist Timer PRXPST[1:0] ALSPST[1:0] 0x0A 0x00 R/W
PROX Threshold
Indicator
ABOVE 0x0B 0x00 R/W
PROX Threshold PRXTHR[7:0] 0x0C 0x00 R/W
Digital Gain Trim of
Green Channel
TRIM_GAIN_GREEN[6:0]
TRIM_
GREEN_
IR[0]
0x0F 0x80 R/W
Digital Gain Trim of
Infrared Channel
TRIM_GAIN_IR[8:1] 0x10 0x80 R/W
REGISTER B7 B6 B5 B4 B3 B2 B1 B0
REGISTER
ADDRESS
POWER-ON
RESET
STATE R/W
Interrupt Status PWRON PRXINTS ALSINTS 0x00 0x04 R
BIT 0 OPERATION
0 No interrupt trigger event has occurred.
1
The ambient light intensity has traversed outside the designated window limits defined by
Threshold registers for greater than persist timer count ALSPST[1:0], or an overflow condition in the ambient light
readings has occurred. This bit also causes the INT pin to be pulled low. Once set, the only way to clear this bit is
to read this register or to set the ALSINTE bit in register 0x01 to 0.