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参数资料
| 型号： | ISL29027IROZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR LIGHT-PROXIMITY 8ODFN |
| 标准包装： | 3,000 |
| 主体材料： | * |
| 电源电压： | 2.25 V ~ 3.63 V |
| 输出类型： | I²C? |
| 端子类型： | PC 引脚 |
| 封装/外壳： | 8-DFN |
ISL29027
TABLE 6. REGISTER 0x04 (PROX_HT) - INTERRUPT HIGH THRESHOLD FOR PROXIMITY SENSOR
BIT #
7:0
ACCESS
RW
DEFAULT
0xFF
BIT NAME
PROX_HT
(Prox Threshold)
FUNCTION/OPERATION
8-bit interrupt high threshold for proximity sensing
TABLE 7. REGISTER 0x08 (PROX_DATA) - PROXIMITY SENSOR DATA
BIT #
7:0
ACCESS
RO
DEFAULT
0x00
BIT NAME
PROX_DATA
(Proximity Data)
FUNCTION/OPERATION
Results of 8-bit proximity sensor ADC conversion
TABLE 8. REGISTER 0x0E (TEST1) - TEST MODE
BIT #
7:0
ACCESS
RW
DEFAULT
0x00
BIT NAME
(Write as 0x00)
FUNCTION/OPERATION
Test mode register. When 0x00, in normal operation
TABLE 9. REGISTER 0x0F (TEST2) - TEST MODE 2
BIT #
7:0
ACCESS
RW
DEFAULT
0x00
BIT NAME
(Write as 0x00)
FUNCTION/OPERATION
Test mode register. When 0x00, in normal operation
I 2 C DATA
START
DEVICE ADDRESS
W A
REGISTER ADDRESS
STOP START
DEVICE ADDRESS
A
DATA BYTE0
I 2 C SDA
MASTER
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 ISL29027
I 2 C SDA
SLAVE (ISL29027)
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 3. I 2 C DRIVER TIMING DIAGRAM FOR MASTER AND SLAVE CONNECTED TO COMMON BUS
Principles of Operation
I 2 C Interface
The ISL29027’s I 2 C interface slave address is internally hardwired
as 0b100010<x>, where “0b” signifies binary notation and x
represents the logic level on pin ADDR0.
Figure 3 shows a sample one-byte read. 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. Every I 2 C transaction begins
with the master asserting a start condition (SDA falling while SCL
remains high). The first transmitted byte is initiated by the
master and includes 7 address bits and a R/W bit. The slave is
responsible for pulling SDA low during the ACK bit after every
subtracts the IR reading before and after the LED is driven (to
remove ambient IR such as sunlight), and converts this value to a
digital count stored in Register 0x8. Because of the conversion
times, the user must let the ADCs perform one full conversion
first before reading from I 2 C Registers PROX_DATA (wait
0.54ms). The proximity sensor runs continuously with a time
between conversions decided by PROX_SLP (Register 1 Bits
[6:4]).(as shown in Figure 4).
0.54m s FOR
PROX
PROX CONVERSION
SENSOR
ACTIVE
TIME
transmitted byte.
Each 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.
IRDR
(CURRENT
DRIVER)
SERIES OF
CURRENT
PULSES
TOTALING 0.1ms
SLEEP TIME
(PROX_SLP)
TIME
Photodiodes and ADCs
The ISL29027 contains photodiode arrays which convert photons
(light) into current. The proximity sensor is an 8-bit ADC. When
proximity sensing is enabled, the IRDR pin will drive a user-
supplied infrared LED, the emitted IR reflects off an object (i.e., a
human head) back into the ISL29027, and a sensor converts the
reflected IR wave to a current signal in 0.54ms. The ADC
7
FIGURE 4. CURRENT DRIVE MODE OPTIONS
Proximity Sensing
When proximity sensing is enabled (PROX_EN = 1), the external
IR LED is driven for 0.1ms by the built-in IR LED driver through
the IRDR pin. The amplitude of the IR LED current depends on
Register 1 bit 3: PROX_DR. If this bit is low, the load will see a
FN7815.1
February 2, 2012
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