Operating Temperature Range .......................... -40NC to +85NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= 1.8V, T
MIN
to T
MAX
= -40NC to +85NC, unless otherwise noted.) (Note 1)
PARAMETER
OPTICAL CHARACTERISTICS
Maximum Lux Sensitivity
Saturation Ambient Lux Level
Total Error
Light Source Matching
Infrared Transmittance at 940nm
Ultraviolet Transmittance at
363nm
Dark Level Count
Maximum Signal Integration
Time
Minimum Signal Integration Time
ADC Conversion Time
POWER SUPPLY
Power-Supply Voltage
Power-Supply Current
DIGITAL I/O CHARACTERISTICS
Output Low Voltage SDA,
INT
INT
Leakage Current
SCL, SDA, A0 Input Current
I
2
C Input Low Voltage
I
2
C Input High Voltage
Address Input Low Voltage
Address Input High Voltage
Input Capacitance
V
OL
I
IH
, I
IL
V
IL_I2C
V
IH_I2C
V
IL_A0
V
IH_A0
I
SINK
= 6mA
T
A
= +25NC
T
A
= +25NC
SDA, SCL
SDA, SCL
A0
A0
V
CC
-
0.3V
3
0.7 x
V
CC
0.3
0.06
0.01
0.01
0.4
20
20
0.3 x
V
CC
V
nA
nA
V
V
V
V
pF
V
CC
I
CC
Guaranteed by TE test
T
A
= +25NC, 90 lux, I
2
C inputs inactive
T
A
= -40NC to +85NC
1.7
0.65
3.6
1.2
1.6
V
FA
ACT
IRR
UVR
0LUX
TE
Fluorescent light
Sunlight
Green LED 538nm response,
T
A
= +25NC (Note 2)
Fluorescent/incandescent light
T
A
= +25NC (Note 3)
T
A
= +25NC (Note 3)
0 lux, T
A
= +25NC, 800ms range
Has 50/60Hz rejection
Automatic mode, has 50/60Hz rejection
Manual mode only
100ms range, T
A
= +25NC
100ms range
99.6
97
10
0
1.2
0
800
100
6.25
100
103
100.4
107
0.045
0.5
0.045
188,000
15
Lux/LSB
Lux
%
%
%
%
Lux
ms
ms
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
Industry’s Lowest-Power
Ambient Light Sensor with ADC
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.8V, T
MIN
to T
MAX
= -40NC to +85NC, unless otherwise noted.) (Note 1)
PARAMETER
I
2
C TIMING
Serial-Clock Frequency
Bus Free Time Between a STOP
and a START Condition
Hold Time (REPEATED) START
Condition
Low Period of the SCL Clock
High Period of the SCL Clock
Setup Time for a Repeated
START Condition
Data Hold Time
Data Setup Time
Fall Time of SDA Transmitting
Setup Time for STOP Condition
Pulse Width of Spike
Suppressed
f
SCL
t
BUF
t
HD,STA
t
LOW
t
HIGH
t
SU,STA
t
HD,DAT
t
SU,DAT
t
F
t
SU,STO
t
SP
Input filters on the SDA and SCL inputs
suppress noise spikes
I
SINK
P
6mA, t
R
and t
F
are measured
between 0.3 x V
DD
and 0.7 x V
DD
0.6
0
50
(Note 4)
1.3
0.6
1.3
0.6
0.6
0
100
100
0.9
400
kHz
Fs
Fs
Fs
Fs
Fs
Fs
ns
ns
Fs
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9635
3
Note 1:
All devices are 100% production tested at T
A
= +25NC. Temperature limits are guaranteed by design.
Note 2:
Guaranteed by design. Green 538nm LED chosen for production so that the IC responds to 100 lux fluorescent light with
100 lux.
Note 3:
With respect to green LED 538nm response.
Note 4:
A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) to bridge
the undefined region of SCL’s falling edge.
Industry’s Lowest-Power
Ambient Light Sensor with ADC
MAX9635
Typical Operating Characteristics
(V
CC
= 1.8V, default power upsetting; unless otherwise noted.)
SPECTRUM RESPONSE
MAX9635 toc01
RADIATION PATTERN
RELATIVE SENSITIVITY (% FROM 0°)
90
80
70
60
50
40
30
20
10
0
AUTO MODE,
INCANDESCENT LAMP
MAX9635 toc02
120
100
NORMALIZED RESPONSE
100
MAX9635 RESPONSE
80
60
40
20
0
300
400
500
600
700
800
900
1000
WAVELENGTH (nm)
CIE
-90
-60
-30
0
30
60
90
LUMINOSITY ANGLE (°)
SPECTRUM OF LIGHT SOURCES
FOR MEASUREMENT
MAX9635 toc03
SUPPLY CURRENT vs. SUPPLY VOLTAGE
0 LUX AND 100 LUX, CONT = 1
1.2
SUPPLY CURRENT (µA)
1.0
0.8
0.6
0.4
0.2
AUTO MODE,
FLUORESCENT LAMP
1.5
1.8
2.1
2.4
2.7
3.0
3.3
3.6
100 LUX, CONT = 0
5000 LUX, CONT = 0
MAX9635 toc04
160
140
NORMALIZED RESPONSE
120
100
80
60
40
20
0
300
400
500 600 700 800
WAVELENGTH (nm)
FLUORESCENT
SUNLIGHT
INCANDESCENT
1.4
0
900 1000
SUPPLY VOLTAGE (V)
OUTPUT CODE ERROR vs. SUPPLY VOLTAGE
OUTPUT CODE ERROR (RATIO FROM 1.8V)
SUPPLY CURRENT vs. TEMPERATURE
V
CC
= 3.3V
MAX9635 toc06
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
1.5
1.8
50 AND 300 LUX
AUTO MODE,
FLUORESCENT LAMP
2.1
2.4
2.7
3.0
3.3
MAX9635 toc05
1.10
1.2
1.0
SUPPLY CURRENT (µA)
0.8
0.6
V
CC
= 2.5V
0.4
0.2
0
100 LUX
AUTO MODE,
FLUORESCENT LAMP
-40
-15
10
35
60
V
CC
= 1.8V
3.6
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
4
Industry’s Lowest-Power
Ambient Light Sensor with ADC
Typical Operating Characteristics (continued)
(V
CC
= 1.8V, default power upsetting; unless otherwise noted.)
SUPPLY CURRENT vs. LUX READING
MAX9635 toc07
MAX9635
LIGHT SENSITIVITY vs. LUX LEVEL
MAX9635 toc08
SDA, INT OUTPUT LOW VOLTAGE
vs. SINK CURRENT
120
110
100
90
80
70
60
50
40
30
20
10
0
0
1
2
3
MAX9635 toc09
3.5
3.0
SUPPLY CURRENT (µA)
2.5
2.0
1.5
1.0
0.5
SUNLIGHT
0
100
1k
10k
350
300
MAX9635 READING (LUX)
250
200
150
100
50
0
INCANDESCENT
LAMP
FLUORESCENT
LAMP
SDA
V
OL
(mV)
INT
100k
0
50
100
150
200
250
300
LUX READING (LUX)
REFERENCE METER READING (LUX)
4 5 6
I
SINK
(mA)
7
8
9
10
Pin Configuration
TOP VIEW
SDA
6
SCL
5
INT
4
MAX9635
+
EP
1
V
CC
2
GND
3
A0
OTDFN
(2mm
x
2mm)
Pin Description
PIN
1
2
3
4
5
6
—
NAME
V
CC
GND
A0
INT
SCL
SDA
EP
Power Supply
Ground
Address Select. Pull high to select address 0x96 or low to select address 0x94.
Interrupt Output. Use an external pullup resistor.
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