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PDF MAX44007 Data sheet ( Hoja de datos )
| Número de pieza | MAX44007 | |
| Descripción | Low-Power Digital Ambient Light Sensor | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-5492; Rev 1; 6/11
EVAALVUAAILTAIOBNLEKIT
Low-Power Digital Ambient Light Sensor
with Enhanced Sensitivity
General Description
The MAX44007 ambient light sensor features an I2C
digital output that is ideal for a number of portable appli-
cations such as smartphones, notebooks, and industrial
sensors. At less than 1µA operating current, it is the
lowest power ambient light sensor in the industry and
features an ultra-wide 22-bit dynamic range from 0.025
lux to 104,448 lux.
Low-light operation allows easy operation in dark glass
applications.
The on-chip photodiode’s spectral response is optimized
to mimic the human eye’s perception of ambient light
and incorporates IR and UV blocking capability. The
adaptive gain block automatically selects the correct lux
range to optimize the counts/lux.
The IC includes two I2C slave address options: 1011
010x and 1011 011x.
The IC is designed to operate from a 1.7V to 3.6V sup-
ply voltage range and consumes only 0.65µA in full
operation. It is available in a small, 2mm x 2mm x 0.6mm
UTDFN-Opto package.
Applications
Tablet PCs/Notebook Computers
TVs/Projectors/Displays
Digital Lighting Management
Portable Devices
Cellular Phones/Smartphones
Security Systems
Features
S Wide 0.025 Lux to 104,448 Lux Range
S Small, 2mm x 2mm x 0.6mm UTDFN-Opto
S VCC = 1.7V to 3.6V
S ICC = 0.65µA Operating Current
S -40NC to +85NC Temperature Range
S Improved Sensitivity Behind Dark Glass
Ordering Information
PART
PIN-PACKAGE
TEMP RANGE
MAX44007EDT+ 6 UTDFN-Opto-EP* -40NC to +85NC
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Block Diagram
VISIBLE +IR
PHOTODIODE
MAX44007
IR
PHOTODIODE
16-BIT
ADC
6-BIT RANGE
CDR, TIM
CONTROL
DIGITAL
SIGNAL
PROCESSING
16-BIT
ADC
VCC
SDA
I2C SCL
AO
INT
N
GND
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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Low-Power Digital Ambient Light Sensor
with Enhanced Sensitivity
Typical Operating Characteristics (continued)
(VCC = 1.8V, default power-up setting; unless otherwise noted.)
SUPPLY CURRENT vs. LUX READING
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
SUNLIGHT
1k 10k
LUX READING (LUX)
100k
MAX44007 READING vs. LUX LEVEL
350
300
INCANDESCENT
200 LAMP
150 FLUORESCENT
LAMP
100
50
0
0 100 200 300 400 500
REFERENCE METER READING (lux)
120
110
100
90
80
70
60
50
40
30
20
10
0
0
SDA INT OUTPUT LOW VOLTAGE
vs. SINK CURRENT
SDA
INT
123456789
ISINK (mA)
10
TOP VIEW
SDA SCL INT
654
Pin Configuration
MAX44007
+ EP
123
VCC GND
A0
UTDFN-Opto
(2mm x 2mm)
Pin Description
PIN NAME
PIN DESCRIPTION
1 VCC Power Supply
2
GND
Ground
3 A0 Address Select. Pull high to select address 1011 011x or low to select address 1011 010x.
4 INT Interrupt Output. Use an external pullup resistor.
5 SCL I2C Clock Bus
6
SDA
I2C Data Bus
— EP Exposed Pad. Connect EP to ground.
5
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Low-Power Digital Ambient Light Sensor
with Enhanced Sensitivity
Lux Low-Byte Register 0x04
BIT 7
—
BIT 6
—
BIT 5
—
BIT 4
—
BIT 3
M3
BIT 2
M2
BIT 1
M1
BIT 0
M0
REGISTER
ADDRESS
0x04
Bits in Lux Low-Byte register 0x04 give the 4 least significant bits of the mantissa byte representing the lux reading
of ambient light. Combined with the Lux High-Byte register 0x03, it extends the resolution and dynamic range of lux
measurements of the IC.
E3–E0: Exponent bits of lux reading
M7–M0: Mantissa byte of lux reading
Lux = 2(exponent) x mantissa x 0.025
Exponent = 8xE3 + 4xE2 + 2xE1 + E0
Mantissa = 128xM7 + 64xM6 + 32xM5 + 16xM4 + 8xM3 + 4xM2 + 2xM1 + M0
Combining contents of register 0x03 and 0x04:
A code of 0000 0000 0001 calculates to be 0.025 lux.
A code of 0000 0001 0000 calculates to be 0.4 lux.
A code of 0001 0001 0001 calculates to be 0.425 lux.
A code of 1110 1111 1111 calculates to be 104,448 lux.
A code of 1110 1111 1110 calculates to be 104,038 lux.
The Lux High-Byte 0x03 and Lux Low-Byte 0x04 register updates are internally disabled at the start of a valid address
transmission from the master. Updating reinitiates at the next valid STOP condition. This prevents erroneous readings,
in the event an update occurs between readings of registers 0x03 and 0x04.
Update of the contents of this register is internally disabled during I2C read operations to ensure proper data transfer
between internal ADC and I2C registers. Update of I2C registers is resumed when the master sends a STOP command.
If the user wants to read both the Lux High-Byte register 0x03 and Lux Low-Byte register 0x04, then the master should
not send a STOP command between the reads of the two registers. Instead a REPEATED START command should
be used. This ensures accurate data is obtained from the I2C registers (by disabling internal updates during the read
process).
Upper Threshold High-Byte Register 0x05
BIT 7
UE3
BIT 6
UE2
BIT 5
UE1
BIT 4
UE0
BIT 3
UM7
BIT 2
UM6
BIT 1
UM5
BIT 0
UM4
REGISTER
ADDRESS
0x05
The Upper Threshold High-Byte register exponent with the four most significant bits of the mantissa sets the upper trip
level for interrupt functionality. This upper limit is relevant only if the INTE bit in the interrupt enable register is set. If the
lux level is greater than 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 (UM[7:4]): Four most significant bits of mantissa upper threshold
Exponent (UE[3:0]): Exponent bits upper threshold
Upper lux threshold = 2(exponent) x mantissa x 0.025
Exponent = 8xUE3 + 4xUE2 + 2xUE1 + UE0
Mantissa = 128xUM7+ 64xUM6+ 32xUM5 + 16xUM4 +15
11
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