Datasheet

Industry’s Lowest-Power

Ambient Light Sensor with ADC

Table 1. Register Map

Table 2. Interrupt Status Register

If the INTE bit is set to 1, then the INTS status bit is asserted if the light intensity exceeds either upper or lower threshold

limits (as specified by registers 0x05 and 0x06, respectively) for a period longer than that defined by the Threshold

Timer register (0x07). This bit resets to 0 after the host reads this register. See Table 2.

This bit is also reflected on the INT pin. When the INTS bit is set, the INT pin is asserted low, and when the INTS bit is

set to 0, the INT pin is pulled high by an external resistor.

Once this bit is set, it can be cleared either by reading the Interrupt Status register 0x00 or by writing a 0 to the Interrupt

Enable register 0x01.

Interrupt Status 0x00

Interrupt Enable 0x01

BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

ADDRESS

— — — — — — — INTS 0x00

BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

ADDRESS

— — — — — — — INTS 0x01

BIT 0 OPERATION

0 No interrupt trigger event has occurred.

1 Ambient light intensity is outside the threshold window range for a longer than specified time.

BIT

ADDRESS

POWER-ON

RESET

STATE

R/W

7 6 5 4 3 2 1 0

STATUS

Interrupt Status — — — — — — — INTS 0x00 0x00 R

Interrupt Enable — — — — — — — INTE 0x01 0x00 R/W

CONFIGURATION

Configuration CONT MANUAL — — CDR TIM[2:0] 0x02 0x03 R/W

LUX READING

Lux High Byte E3 E2 E1 E0 M7 M6 M5 M4 0x03 0x00 R

Lux Low Byte — — — — M3 M2 M1 M0 0x04 0x00 R

THRESHOLD SET

Upper Threshold

High Byte

UE3 UE2 UE1 UE0 UM7 UM6 UM5 UM4 0x05 0xFF R/W

Lower Threshold

High Byte

LE3 LE2 LE1 LE0 LM7 LM6 LM5 LM4 0x06 0x00 R/W

Threshold Timer T7 T6 T5 T4 T3 T2 T1 T0 0x07 0xFF R/W

Maxim Integrated

MAX44009