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参数资料
| 型号： | ISL29015IROZ-EVALZ |
| 厂商： | Intersil |
| 文件页数： | 5/13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
programmable continuous proximity sensing. These six modes
can be programmed in series to fulfill the application needs.
When the part is programmed for ambient light sensing, the
ambient light with wavelength within the “Ambient Light
Sensing” spectral response curve in Figure 6 is converted
into current. With ADC, the current is converted to an
unsigned n-bit (up to 16 bits) digital output.
When the part is programmed for infrared (IR) sensing, the
IR light with wavelength within the “IR or Proximity Sensing”
spectral response curve on Figure 6 is converted into
current. With ADC, the current is converted to an unsigned
n-bit (up to 16 bits) digital output.
When the part is programmed for proximity sensing, the
external IR LED is turned on by the built-in IR LED driver
through the IRDR pin. The amplitude of the IR LED current
and the IR LED modulation frequency can be programmed
through Command Register II. When the IR from the LED
reaches an object and gets reflected back, the reflected IR
light with wavelength within the “IR or Proximity Sensing”
spectral response curve in Figure 6 is converted into current.
With ADC, the current is converted to an unsigned n-bit (up
to 16 bits) digital output. The output reading is inversely
proportional to the square of the distance between the
sensor and the object. When there is significant background
IR noise like direct sunlight, both IR and proximity sensing
can be implemented for background noise cancellation. The
differential output reading from the ADC decreases with
distance.
I 2 C Interface
There are four 8-bit registers available inside the ISL29015.
The two command registers define the operation of the device.
The command registers do not change until the registers are
overwritten. The two 8-bit data Read Only registers are for the
ADC output. The data registers contain the ADC's latest digital
output, or the number of clock cycles in the previous integration
period.
The ISL29015’s I 2 C interface slave address is internally
hardwired as 1000100. When 1000100x with x as R or W is
sent after the Start condition, this device compares the first
seven bits of this byte to its address and matches.
Figure 1 shows a sample one-byte read. Figure 2 shows a
sample one-byte write. The I 2 C bus master always drives
the SCL (clock) line, while either the master or the slave can
drive the SDA (data) line. Figure 2 shows a sample write.
Every I 2 C transaction begins with the master asserting a
start condition (SDA falling while SCL remains high). The
following byte is driven by the master, and includes the slave
address and read/write bit. The receiving device is
responsible for pulling SDA low during the
acknowledgement period. Every I 2 C transaction ends with
the master asserting a stop condition (SDA rising while SCL
remains high).
For more information about the I 2 C standard, please consult
the Philips? I 2 C specification documents.
I 2 C DATA
START
DEVICE ADDRESS
W A
REGISTER ADDRESS
STOP START
DEVICE ADDRESS
A
DATA BYTE0
I 2 C SDA
IN
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
A6 A5 A4 A3 A2 A1 A0 W
A
SDA DRIVEN BY ISL29015
I 2 C SDA
OUT
SDA DRIVEN BY MASTER
A
SDA DRIVEN BY MASTER
A
SDA DRIVEN BY MASTER
A D7 D6 D5 D4 D3 D2 D1 D0
I 2 C CLK
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
FIGURE 1. I 2 C READ TIMING DIAGRAM SAMPLE
5
FN6522.0
October 31, 2008
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