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MAX44007
Low-Power Digital Ambient Light Sensor
with Enhanced Sensitivity
Lower Threshold High-Byte Register 0x06
BIT 7
LE3
BIT 6
LE2
BIT 5
LE1
BIT 4
LE0
BIT 3
LM7
BIT 2
LM6
BIT 1
LM5
BIT 0
LM4
REGISTER
ADDRESS
0x06
The Lower Threshold High-Byte register exponent with the four most significant bits of the mantissa sets the lower trip
level for interrupt functionality. This lower limit is relevant only if the INTE bit in the Interrupt Enable register is set. If the
lux level is below this light level for a time greater than that specified in the Threshold Timer register, the INTS bit in the
Interrupt Status register is set and the INT pin is pulled low.
Mantissa (LM[7:4]): Four most significant bits of mantissa lower threshold
Exponent (LE[3:0]): Exponent bits lower threshold
Lower lux threshold = 2 (exponent) x mantissa x 0.025
Exponent = 8xLE3 + 4xLE2 + 2xLE1 + LE0
Mantissa = 128xLM7 + 64xLM6 + 32xLM5 + 16xLM4
Threshold Timer Register 0x07
BIT 7
T7
BIT 6
T6
BIT 5
T5
BIT 4
T4
BIT 3
T3
BIT 2
T2
BIT 1
T1
BIT 0
T0
REGISTER
ADDRESS
0x07
If the INTE bit = 1 and the ambient light level exceeds either threshold limit for a time longer than that specified by the
Threshold Timer register, then the INTS bit is set to 1 and the INT pin is pulled low.
The value in this register sets the time used to control this delay. A value of 0x00 in this register (with INTE bit = 1 in the
Interrupt Enable register) configures the IC to assert the interrupt pin as soon as the light level exceeds either threshold.
Time delay = (128xT7 + 64xT6 + 32xT5 + 16xT4 + 8xT3 + 4xT2 + 2xT1 + T0) x 100ms.
Applications Information
Auto and Manual Modes
In auto mode configuration (default setting), CDR and
TIM bits are internally generated. The autoranging circuit
uses two different methods to change its sensitivity. For
light intensities greater than 700 lux, a current divider
reduces the photodiode’s current by a factor of 8. The
default, as in the previous example, is a division of 1:
current goes directly into the I to F converter. As light
intensity decreases, the autoranging circuit increases
the integration time from 100ms to 200ms to 400ms, or
to 800ms. The combination of the current divider and the
different integration times give the A/D a range 8 times
higher, as well as 8 times lower, than its nominal 16-bit
range. This gives a dynamic range of 22 bits or slightly
over 4,000,000 to 1.
In manual mode, the user has access to 4 bits (CDR and
TIM[2:0]) to override the autoranging circuitry. These
affect the integration time of the A/D and the current
division ratio. See the register description for manual
configuration mode (0x02, bit 6).
12
Data Format of Lux Reading
The IC has a user-friendly digital output format. It con-
sists of a 4-bit exponent followed by an 8-bit mantissa.
In its highest sensitivity mode, 1 count represents 0.025
lux. The mantissa has a maximum value of 255, and the
exponent has a maximum value of 14. This gives a maxi-
mum range: 255 x 2 14 = 4,177,920. At 0.025 lux/LSB, the
maximum lux reading is 104,448 lux. Any reading greater
than that (i.e., exponent = 15) is considered to be an
overload. No conversion formulas are needed as in the
case of dual-diode ambient light sensors.
The IC’s output (registers 0x03 and 0x04) comprises a
12-bit result that represents the ambient light expressed
in units of lux.
Here is how lux is calculated:
Lux = (2 (exponent) x mantissa) x 0.025
The exponent is a 4-bit number ranging from 0000 to
1110 (zero to 14).
The mantissa is an 8-bit number ranging from 0000 0000
to 1111 1111 (zero to 255).
Maxim Integrated
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