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MAX44009
Industry’s Lowest-Power
Ambient Light Sensor with ADC
Register and Bit Descriptions
Table 1. Register Map
REGISTER
7
6
5
BIT
4
3
2
1
0
REGISTER
ADDRESS
POWER-ON
RESET
STATE
R/W
STATUS
Interrupt Status
Interrupt Enable
—
—
—
—
—
—
—
—
—
—
—
—
—
—
INTS
INTE
0x00
0x01
0x00
0x00
R
R/W
CONFIGURATION
Configuration
CONT
MANUAL
—
—
CDR
TIM[2:0 ]
0x02
0x03
R/W
LUX READING
Lux High Byte
Lux Low Byte
E3
—
E2
—
E1
—
E0
—
M7
M3
M6
M2
M5
M1
M4
M0
0x03
0x04
0x00
0x00
R
R
THRESHOLD SET
Upper Threshold
High Byte
Lower Threshold
High Byte
Threshold Timer
UE3
LE3
T7
UE2
LE2
T6
UE1
LE1
T5
UE0
LE0
T4
UM7
LM7
T3
UM6
LM6
T2
UM5
LM5
T1
UM4
LM4
T0
0x05
0x06
0x07
0xFF
0x00
0xFF
R/W
R/W
R/W
Interrupt Status 0x00
BIT 7
—
BIT 6
—
BIT 5
—
BIT 4
—
BIT 3
—
BIT 2
—
BIT 1
—
BIT 0
INTS
REGISTER
ADDRESS
0x0 0
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.
Table 2. Interrupt Status Register
BIT 0
0
1
OPERATION
No interrupt trigger event has occurred.
Ambient light intensity is outside the threshold window range for a longer than specified time.
Interrupt Enable 0x01
BIT 7
—
BIT 6
—
BIT 5
—
BIT 4
—
BIT 3
—
BIT 2
—
BIT 1
—
BIT 0
INTS
REGISTER
ADDRESS
0x01
Maxim Integrated
7
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