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ISL29015IROZ-EVALZ Folha de dados(PDF) 4 Page - Intersil Corporation

Nome de Peças ISL29015IROZ-EVALZ
Descrição Electrónicos  Integrated Digital Ambient Light Sensor and Proximity Sensor
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

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4
FN6522.0
October 31, 2008
Principles of Operation
Photodiodes and ADC
The ISL29015 contains two photodiode arrays which convert
light into current. The spectral response for ambient light
sensing and IR sensing is shown in Figure 6 in the performance
curves section. After light is converted to current during the light
signal process, the current output is converted to digital by a
built-in 16-bit Analog-to-Digital Converter (ADC). An I2C
command reads the ambient light or IR intensity in counts.
The converter is a charge-balancing integrating type 16-bit
ADC. The chosen method for conversion is best for converting
small current signals in the presence of an AC periodic noise. A
100ms integration time, for instance, highly rejects 50Hz and
60Hz power line noise simultaneously.
The built-in ADC offers user flexibility in integration time or
conversion time. There are two timing modes: Internal Timing
Mode and External Timing Mode. In Internal Timing Mode,
integration time is determined by an internal oscillator (fOSC),
and the n-bit (n = 4, 8, 12,16) counter inside the ADC. In
External Timing Mode, integration time is determined by the
time between two consecutive I2C External Timing Mode
commands. See “Integration and Conversion Time” on page 7.
A good balancing act of integration time and resolution
depending on the application is required for optimal results.
The ADC has I2C programmable range select to dynamically
accommodate various lighting conditions. For very dim
conditions, the ADC can be configured at its lowest range
(Range 1) in the ambient light sensing. For very bright
conditions, the ADC can be configured at its highest range
(Range 4) in the proximity sensing.
Low-Power Operation
The ISL29015 initial operation is at the power-down mode after
a supply voltage is provided. The data registers contain the
default value of 0. When the ISL29015 receives an I2C
command to do a one-time measurement from an I2C master, it
will start ADC conversion with light or proximity sensing. It will
go to the power-down mode automatically after one conversion
is finished and keep the conversion data available for the
master to fetch anytime afterwards. The ISL29015 will
continuously do ADC conversion with light or proximity sensing
if it receives an I2C command of continuous measurement. It
will continuously update the data registers with the latest
conversion data. It will go to the power-down mode after it
receives the I2C command of power-down.
Ambient Light, IR and Proximity Sensing
There are six operational modes in ISL29015: Programmable
ALS once with auto power-down, programmable IR sensing
once with auto power-down, programmable proximity sensing
once with auto power-down; programmable continuous ALS
sensing, programmable continuous IR sensing and
ISDA
SDA Current Sinking Capability
4
5
mA
IIRDR1
IRDR Source Current
IS<1:0> = 0 (Note 4)
1.5V at IRDR pin
100
mA
IIRDR2
IRDR Source Current
IS<1:0> = 1 (Note 4)
44
50
56
mA
IIRDR3
IRDR Source Current
IS<1:0> = 2 (Note 4)
25
mA
IIRDR4
IRDR Source Current
IS<1:0> = 3 (Note 4)
12.5
mA
VIRLED
Voltage Head Room of IRDR Pin
VDD - 0.6
V
tr
Rise Time for IRDR Source Current RLOAD = 15Ω at IRDR pin, 20% to 80%
35
ns
tf
Fall Time for IRDR Source Current
RLOAD = 15Ω at IRDR pin, 80% to 20%
10
ns
fIRLED1
IR LED Modulation Frequency
Freq<1:0> = 0 (Note 4)
DC
kHz
fIRLED2
IR LED Modulation Frequency
Freq<1:0> = 3 (Note 4)
360
kHz
IDD (IRLED1) Supply Current of Proximity Sensing IS<1:0> = 0, Freq<1:0> = 0 (Note 4)
101
mA
IDD (IRLED2) Supply Current of Proximity Sensing IS<1:0> = 0, Freq<1:0> = 3 (Note 4)
51
mA
Duty Cycle
Duty Cycle of IR LED Modulation
50
%
PROX-IR
PROX
Differential ADC Output of IR and
Proximity Sensing With Object Far
Away to Provide No Reflection
IR and proximity sensing with Range 2; 1.5V @ IRDR
pin, IS<1:0> = 0, Freq<1:0> = 0; E = 210 lux, Sunlight.
2.0
%
NOTES:
2. 550nm green LED is used in production test. The 550nm LED irradiance is calibrated to produce the same DATA count against an illuminance
level of 300 lux fluorescent light.
3. 850nm infrared LED is used in production test. The 850nm LED irradiance is calibrated to produce the same DATA_IR count against an
illuminance level of 210 lux sunlight at sea level.
4. See “Register Set” on page 6.
Electrical Specifications
VDD = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance, 16-bit ADC operation, unless
otherwise specified. (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
ISL29015


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