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| 型号： | ISL29015IROZ-EVALZ |
| 厂商： | Intersil |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL29015 |
| 标准包装： | 1 |
| 传感器类型： | 灯光，数字式输出 |
| 传感范围： | 65535Lux |
| 接口： | I²C，SM 总线 |
| 灵敏度： | 540nm |
| 电源电压： | 2.25 V ~ 3.3 V |
| 嵌入式： | 否 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL29015 |
ISL29015
(A/D) converter samples the photodiode current signal for
a measurement.
Here, Range(k) is defined in Table 6. Count max is the
maximum output counts from the ADC.
.
TABLE 5. RESOLUTION/WIDTH
The transfer function used for n-bit ADC becomes:
E cal = --------------------------- × DATA
2
BITS 3:2
00
NUMBER OF CLOCK CYCLES
2 16 = 65,536
n-BIT ADC
16
Range ( k )
n
(EQ. 3)
01
10
11
2 12 = 4,096
2 8 = 256
2 4 = 16
12
8
4
Here, n = 4, 8, 12 or 16. This is the number of ADC bits
programmed in the command register. 2 n represents the
maximum number of counts possible from the ADC output.
Data is the ADC output stored in the data registers (02 hex
t int = 2 × -------------- = 2 × ----------------------------------------------
f OSC
4. Range: Bits 1 and 0. The Full Scale Range (FSR) can be
adjusted via I 2 C using Bits 1 and 0. Table 6 lists the
possible values of FSR for the 499k Ω R EXT resistor.
TABLE 6. RANGE/FSR LUX
BITS FSR (LUX) @ FSR @ IR
1:0 k RANGE(k) ALS SENSING SENSING
and 03 hex).
Integration and Conversion Time
The ADC resolution and f OSC determines the integration
time, t int .
n 1 n R EXT (EQ. 4)
725kHz × 499k Ω
00
01
10
11
1
2
3
4
Range1
Range2
Range3
Range4
1,000
4,000
16,000
64,000
Refer to page 3
Refer to page 3
Refer to page 3
Refer to page 3
where n is the number of bits of resolution and n = 4, 8, 12 or
16. 2 n , therefore, is the number of clock cycles. n can be
programmed at the command register 01(hex) bits 3 and 2.
TABLE 8. INTEGRATION TIME OF n-BIT ADC
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
R EXT
(k Ω)
250
499**
n = 16-BIT
45ms
90ms
n = 12-BIT
2.812ms
5.63ms
n = 8-BIT
175.5μs
351μs
n = 4-BIT
10.8μs
21.6μs
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.
TABLE 7. DATA REGISTERS
ADDRESS
(hex) CONTENTS
**Recommended R EXT resistor value
External Scaling Resistor R EXT for f OSC and
Range
The ISL29015 uses an external resistor R EXT to fix its
internal oscillator frequency, f OSC and the light sensing
range. f OSC and Range are inversely proportional to R EXT .
For user simplicity, the proportionality constant is referenced
02
D0 is LSB for 4, 8, 12 or 16-bit resolution, D3 is MSB
to 499k Ω :
Range = ------------------ × Range ( k )
f OSC = ------------------ × 725 kHz
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
Calculating Lux
499k Ω
R EXT
499k Ω
R EXT
(EQ. 5)
(EQ. 6)
E cal = α × DATA
α = ----------------------------
Range ( k )
The ISL29015’s ADC output codes, DATA, are directly
proportional to lux in the ambient light sensing.
(EQ. 1)
Here, E cal 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 is shown in Equation 2.
(EQ. 2)
Count max
7
Noise Rejection
In general, integrating type ADC’s have excellent
noise-rejection characteristics for periodic noise sources whose
frequency is an integer multiple of the conversion rate. For
instance, a 60Hz AC unwanted signal’s sum from 0ms to
k*16.66ms (k = 1,2...k i ) is zero. Similarly, setting the device’s
integration time to be an integer multiple of the periodic noise
signal, greatly improves the light sensor output signal in the
presence of noise.
ADC Output in IR Sensing
The ISL29015’s ADC output codes, DATA, are directly
proportional to the IR intensity received in the IR sensing
phase.
FN6522.0
October 31, 2008
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