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ISL29011 Datasheet(PDF) 8 Page - Intersil Corporation

No. de pieza ISL29011
Descripción Electrónicos  Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29011 Datasheet(HTML) 8 Page - Intersil Corporation

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8
FN6467.2
May 14, 2009
Command Register II 01(hex)
The second command register has the following functions:
1. Proximity Sensing Scheme: Bit 7. This bit programs the
function of the proximity detection. Logic 0 of this bit,
Scheme 0, makes full n (4, 8, 12, 16) bits (unsigned)
proximity detection. The range of Scheme 0 proximity
count is from 0 to 2n. Logic 1 of this bit, Scheme 1, makes
n-1 (3, 7, 11, 15) bits (2’s complementary)
proximity_less_ambient detection. The range of Scheme
1 proximity count is from -2(n-1) to 2(n-1). While Scheme
0 has wider dynamic range, Scheme 1 proximity
detection is less affected by the ambient IR noise
variation.
2. Modulation Frequency: Bits 6. This bit sets the IR LED
driver’s modulation frequency.
3. Amplitude of IR driver current: Bits 5 and 4. This device
provides current source to drive an external IR LED. The
drive capability can be programmed through Bits 5 and 4.
For example, the device sources 12.5mA out of the IRDR
pin if Bits 5 and 4 are 0.
4. Resolution: Bits 3 and 2. Bits 3 and 2 determine the ADC’s
resolution and the number of clock cycles per conversion
in Internal Timing Mode. Changing the number of clock
cycles does more than just change the resolution of the
device. It also changes the integration time, which is the
period the device’s analog-to-digital (A/D) converter
samples the photodiode current signal for a measurement.
.
5. Range: Bits 1 and 0. The Full Scale Range (FSR) can be
adjusted via I2C using Bits 1 and 0. Table 9 lists the
possible values of FSR for the 499k
Ω REXT resistor.
Data Registers (02 hex and 03 hex)
The device has two 8-bit read-only registers to hold the data
from LSB to MSB for ADC. The most significant bit (MSB) is
accessed at 03 hex, and the least significant bit (LSB) is
accessed at 02 hex. For 16-bit resolution, the data is from
D0 to D15; for 12-bit resolution, the data is from D0 to D11;
for 8-bit resolution, the data is from D0 to D7. The registers
are refreshed after every conversion cycle.
Interrupt Registers (04, 05, 06 and 07 hex)
Registers 04 and 05 hex set the low (LO) threshold for the
interrupt pin and the interrupt flag. 04 hex is the LSB and 05
hex is the MSB. By default, the Interrupt threshold LO is 00
hex for both LSB and MSB.
Registers 06 and 07 hex set the high (HI) threshold for the
interrupt pin and the interrupt flag. 06 hex is the LSB and 07
hex is the MSB. By default, the Interrupt threshold HI is FF
hex for both LSB and MSB.
Calculating Lux
The ISL29011’s ADC output codes, DATA, are directly
proportional to lux in the ambient light sensing.
Here, Ecal is the calculated lux reading. The constant α is
determined by the Full Scale Range and the ADC’s
maximum output counts. The constant is independent on the
light sources (fluorescent, incandescent and sunlight)
because of the light sources’ IR component is removed
during the light signal process. The constant can also be
viewed as the sensitivity: the smallest lux measurement the
device can measure as shown in Equation 2.
Here, Range(k) is defined in Table 9. Countmax is the
maximum output counts from the ADC.
TABLE 5. PROXIMITY SENSING SCHEME
BIT 7
OPERATION
0
Sensing IR from LED and ambient
1
Sensing IR from LED with ambient IR rejection
TABLE 6. MODULATION FREQUENCY
BITS 6
MODULATION FREQUENCY
(kHz)
0DC
1
360
TABLE 7. CURRENT SOURCE CAPABILITY AT IRDR PIN
BITS 5 TO 4
IRDR PIN SOURCE CURRENT
00
12.5mA IR LED driver
01
25mA IR LED driver
10
50mA IR LED driver
11
100mA IR LED driver
TABLE 8. RESOLUTION/WIDTH
BITS 3 TO 2
NUMBER OF CLOCK CYCLES
n-BIT ADC
00
216 = 65,536
16
01
212 = 4,096
12
10
28 = 256
8
11
24 = 16
4
TABLE 9. RANGE/FSR LUX
BITS
1:0
k
RANGE(k)
FSR (LUX) @
ALS SENSING
FSR @ IR
SENSING
00
1
Range1
1,000
Refer to page 4
01
2
Range2
4,000
Refer to page 4
10
3
Range3
16,000
Refer to page 4
11
4
Range4
64,000
Refer to page 4
TABLE 10. DATA REGISTERS
ADDRESS
(hex)
CONTENTS
02
D0 is LSB for 4, 8, 12 or 16-bit resolution, D3 is MSB
for 4-bit resolution, D7 is MSB for 8-bit resolution
03
D15 is MSB for 16-bit resolution, D11 is MSB for
12-bit resolution
Ecal
α DATA
×
=
(EQ. 1)
α
Range k
()
Countmax
----------------------------
=
(EQ. 2)
ISL29011


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