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PDF ISL29035 Data sheet ( Hoja de datos )
| Número de pieza | ISL29035 | |
| Descripción | Integrated Digital Light Sensor | |
| Fabricantes | Intersil | |
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DATASHEET
Integrated Digital Light Sensor with Interrupt
ISL29035
The ISL29035 is an integrated ambient and infrared
light-to-digital converter with I2C (SMBus Compatible) Interface.
Its advanced self-calibrated photodiode array emulates human
eye response with excellent IR rejection. The on-chip ADC is
capable of rejecting 50Hz and 60Hz flicker caused by artificial
light sources. The Lux range select feature allows users to
program the Lux range for optimized counts/Lux.
For ambient light sensing, an internal 16-bit ADC has been
designed based upon the charge-balancing technique. The
ADC conversion time is nominally 105ms and is user
adjustable from 11µs to 105ms, depending on oscillator
frequency and ADC resolution. In normal operation, typical
current consumption is 57µA. In order to further minimize
power consumption, two power-down modes have been
provided. If polling is chosen over continuous measurement of
light, the auto-power-down function shuts down the whole chip
after each ADC conversion for the measurement. The other
power-down mode is controlled by software via the I2C
interface. The power consumption can be reduced to less than
0.3µA when powered down.
The ISL29035 supports a software brownout condition
detection. The device powers up with the brownout bit asserted
until the host clears it through the I2C interface.
The ISL29035 supports a software and hardware interrupt that
remains asserted until the host clears it through the I2C
interface. Function of ADC conversion continues without
stopping after interrupt is asserted.
Designed to operate on supplies from 2.25V to 3.63V with an I2C
supply from 1.7V to 3.63V, the ISL29035 is specified for
operation over the -40°C to +85°C ambient temperature range.
Features
• Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16-bits ADC
• Wide dynamic range . . . . . . . . . . . . . . . . . . . . . . .1:4,200,000
• Integrated noise reduction . . . . . . . . . . . . . . . . . . . . . 50/60Hz
• Close to human eye response with excellent IR/UV rejection
• Shutdown modes . . . . . . . . . . . . . . . .Software and Automatic
• Programmable interrupt threshold with persistence filter
• Supply current (typ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57µA
• Shutdown current (max) . . . . . . . . . . . . . . . . . . . . . . . . 0.51µA
• I2C (SMB compatible) power supply . . . . . . . . . 1.7V to 3.63V
• Sensor power supply . . . . . . . . . . . . . . . . . . . . . 2.25V to 3.63V
• Operating temperature range. . . . . . . . . . . . . -40°C to +85°C
• Small form factor package . . . . . . . 6 Ld 1.5x1.6x0.75 ODFN
Applications
• Mobile devices: smart phone, PDA, GPS
• Computing devices: notebook PC, MacBook, tablets
• Consumer devices: LCD-TV, digital camera
• Industrial and medical light sensing
VDD_PULLUP
4.7k 4.7k 4.7k
SDA
100
VDD
6 SDA
1
VDD
1µF
MCU SCL
5 SCL ISL29035 NC 3
GPIO
4 INT
GND
2
FIGURE 1. ISL29035 TYPICAL APPLICATION DIAGRAM
1.2
1.0
HUMAN EYE
0.8
AMBIENT LIGHT SENSOR
0.6
0.4
0.2
0
300 400 500 600 700 800 900 1000 1100
WAVELENGTH (nm)
FIGURE 2. NORMALIZED SPECTRAL RESPONSE FOR AMBIENT
LIGHT SENSING
November 12, 2014
FN8371.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013, 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
SDA vs SCL Timing
ISL29035
SCL
tSU:STA
SDA
(INPUT TIMING)
SDA
(OUTPUT TIMING)
tF
tSU:DAT
tHD:STA
tHIGH
tLOW
tR
tHD:DAT
tAA tDH
FIGURE 3. I2C BUS TIMING
tHD:STO
tSU:STO
tBUF
SCL
SDA
8TH BIT OF LAST BYTE
ACK
STOP
CONDITION
tWC
FIGURE 4. I2C WRITE CYCLE TIMING
START
CONDITION
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November 12, 2014
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ISL29035
OPERATION MODE BITS (B5 - B7)
The ISL29035 has different operating modes. These modes are
selected by setting B5 - B7 bits on register address 0x00. The
device powers up on a disable mode. Table 6 lists the possible
operating modes.
TABLE 6. OPERATING MODES BITS
B7 B6 B5
OPERATION
0 0 0 Power-down the device (Default)
0
0
1
The device measures ALS only once every integration cycle.
This is the lowest operating mode. (Note 14)
0 1 0 IR once
0 1 1 Reserved (DO NOT USE)
1 0 0 Reserved (DO NOT USE)
1 0 1 Measures ALS continuously
1 1 0 Measures IR continuous
1 1 1 Reserved (DO NOT USE)
NOTE:
14. Intersil does not recommend using this mode.
Command-II Register (Address: 0x01)
TABLE 7. COMMAND-II REGISTER BITS
NAME
ADDR
REGISTER BITS
(Hex) B7 B6 B5 B4 B3 B2 B1
DFLT
B0 (Hex)
COMMANDII 0x01 RESERVED RES1 RES0 RANGE1 RANGE0 0x00
The Command-II register consists of ADC control bits. In this
register, there are two range bits and two ADAC resolution bits.
The default register value is 0x00 at power-on.
FULL SCALE LUX RANGE (B0 - B1)
The full scale Lux range has four different selectable ranges. The
range determines the full scale Lux range (1k, 4k, 16k, and 64k).
Each range has a maximum allowable Lux value. Lower range
values offer better resolution. Table 8 lists the possible values
of Lux.
TABLE 8. RANGE REGISTER BITS
RANGE SELECTION
B1
FULL SCALE LUX RANGE
B0 (LUX)
0 0 0 1,000
1 0 1 4,000
2
10
16,000
3
11
64,000
ADC RESOLUTION (B3 - B2)
B2 and B3 determine the ADC’s resolution and the number of
clock cycles per conversion. 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. Table 9 lists the possible ADC
resolution. Only 16bit ADC resolution can reject better 50/60Hz
noise flickering light source.
.
B3
0
0
1
1
TABLE 9. ADC RESOLUTION DATA WIDTH
B2 NUMBER OF CLOCK CYCLES
0 216 = 65,536
1 212 = 4,096
0 28 = 256
1 24 = 16
n-BIT ADC
16
12
8
4
Integration Time
TABLE 10. INTEGRATION TIME OF n-BIT ADC
n # ADC BITS
4
8
12
16
INTEGRATION TIME (ms)
0.0256
0.41
6.5
105
Data Registers (Addresses: 0x02 and 0x03)
TABLE 11. ADC REGISTER BITS
ADDR
REGISTER BITS
DFLT
NAME (Hex) B7 B6 B5 B4 B3 B2 B1 B0 (Hex)
DATALSB 0x02 D7 D6 D5 D4 D3 D2 D1 D0 0x00
DATAMSB 0x03 D15 D14 D13 D12 D11 D10 D9 D8 0x00
The ISL29035 has two 8-bit read-only registers to hold the upper
and lower byte of the ADC value. The upper byte is accessed at
address 0x03 and the lower byte is accessed at address 0x02.
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 and for 4-bit resolution, the data is from D0
to D3. The registers are refreshed after every conversion cycle.
The default register value is 0x00 at power-on.
TABLE 12. ADC DATA REGISTERS
ADDRESS
(HEX)
CONTENTS
0x02
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
0x03
D15 is MSB for 16-bit resolution; D11 is MSB for 12-bit
resolution
Lower Interrupt Threshold Registers
(Address: 0x04 and 0x05)
TABLE 13. INTERRUPT REGISTER BITS
NAME
ADDR
REGISTER BITS
DFLT
(Hex) B7 B6 B5 B4 B3 B2 B1 B0 (Hex)
INT_LT_LSB 0x04 TL7 TL6 TL5 TL4 TL3 TL2 TL1 TL0 0x00
INT_LT_MSB 0x05 TL15 TL14 TL13 TL12 TL11 TL10 TL9 TL8 0x00
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL29035.PDF ] | |
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