SFH-5712_技术文档

Hochgenauer Umgebungslichtsensor mit I²C Bus Schnittstelle

High Accuracy Ambient Light Sensor with I²C Bus Interface

Lead (Pb) Free Product - RoHS Compliant

SFH 5712

Wesentliche Merkmale

Features

• Gut an die Augenempfindlichkeit (Vλ)

angepasst

• Good match to Human Eye Sensitivity (Vλ)

• Hohe Genauigkeit von 3 - 65.000lx

• I²C Bus Schnittstelle

• High accuracy from 3 - 65,000lx

• I²C bus Interface

100kbit/s; 400kbit/s; 1,0 Mbit/s und 3,4 Mbit/s

• Niedriger Temperaturkoeffizient der

Fotoempfindlichkeit

100kbit/s; 400kbit/s; 1.0 Mbit/s and 3.4 Mbit/s

• Low temperature coefficient of photosensitivity

Anwendungen

Applications

für Consumer und Mobilegeräte

for consumer and mobile applications

• Umgebungslicht Messung

• Steuerung von Displayhinterleuchtungen

• Sonnenlicht Sensor

• Ambient light measurement

• Control of display backlighting

• Sunlight sensor

Typ

Type

Bestellnummer

Ordering code

Digitaler Ausgang, E_v= 1000lx, (white LED)

Digital out

Out

SFH 5712-2/3¹⁾Q65110A8485

500-1600

1)

Nur eine Gruppe innerhalb einer Verpackungseinheit (Streuung kleiner als 2:1)

Only one bin within one packing unit (variation lower 2:1)

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SFH 5712

Application diagram and basic operation

V_IO= 1.8V

V_DD= 2.5V

100nF

V_DD

1

SDA

I_IO

3

MCU

SFH 5712

SCL

4

2

GND

Proposed size for the pull-up resistor is 560W

Basic operation

Register address

Command

Action

switch V_DDon

Wait >1ms

Write 03

0x80

Ambient Light Sensor in ACTIVE mode

Wait >250 ms

Read data

0x8C

0x8D

0x80

read LSB data from ambient light measurement

(LSB = least significant Byte of 16bit output)

Read data

Write 00

read MSB data from ambient light measurement

(MSB = most significant Byte of 16bit output)

Ambient Light Sensor in STAND-BY mode

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SFH 5712

Addressing for basic operation

S Address 0x29 W A Register 0x80 A

0x03

A P

S Address 0x29 W A Register 0x8C A P

S Address 0x29 R A LSB DATA NA P

S Address 0x29 W A Register 0x8D A P

S Address 0x29 R A MSB DATA NA P

S Address 0x29 W A Register 0x80 A

0x00

A P

Communication from master to SFH 5712

Communication from SFH 5712 to master

W= Master writes

R = Master reads

A = acknowledge

NA= not acknowledge

S = START condition

P = STOP condition

LSB = least significant byte

MSB = most significant byte

I²C interface

• 1.8V IO-logic level for SDA and SCL

• IO-pins are open drain type and logic high level is set with external pull-up resistor

• SFH 5712-1/2 operates always as slave, address is 0x29 (7bits). Bit 0 is used to change between

Read (R/W bit =1) and Write mode (R/W bit =0)..

Address 0x29

Bit

7

6

5

4

3

2

1

0

R/W bit

X

Address

default

0

1

0

1

0

1

• Designed for the I²C-High Speed modes (3.4Mbit/s)

• see I²C Bus specification UM10204 from NXP for detailed information

• Spikes up to 10 ns are suppressed on SDA & SCL

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SFH 5712

Modes

OFF

If VDD = 0 or not connected the device is inactive. Other units may use the I2C bus

without any restrictions; I/O pins are in Z state.

STAND-BY

ACTIVE

This is the initial mode after power-up. I_DDis below 2.5μA. No measurement is

performed. Only register 0x80 can be read and written. Device can be activated by

I²C bus communication.

Measurements are triggered internally by SFH5712. The measurement repetition

rate is 2/s. Measurement results can be read from the data register

V_DD= 0V

deactivation

OFF

STAND-BY

ACTIVE

activation

V_DDconnected

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SFH 5712

Maximum Ratings

Parameter

Symbol Value

Unit

°C

V

Storage temperature

Supply voltage

T_stg

– 40 … + 85

V_DD

-0.3 ... +4.5

-0.3 ... +2.5

2

I²C - Bus voltage

V_IO

V

Electrostatic discharge

kV

ESD_hbm

Human Body Model according to

EOS/ESD-5.1-1993

Electrostatic discharge

500

V

ESD_cdm

charge device model according to

JEDEC JESD22-C101D

Operating Conditions

Parameter

Symbol

Value

typ.

Unit

min.

-15

max.

70

Operating temperature

Supply voltage

T_op

°C

V

V_DD

dV_DD

2.3

3.0

Supply voltage ripple

100

mV

(frequency: 0...100Mhz, sinus wave)

Digital output range

Out

V_IO

I_IO

3

65k

2.0

12

counts

V

I²C - Bus voltage

Output current „Low“¹⁾

1.6

3

mA

1)

FAST MODE PLUS: requirement of Iout_low 20mA is not met.

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SFH 5712

Characteristics

Parameter

Symbol

Value

typ.

Unit

min.

max.

Mean current consumption

ACTIVE mode, E_V= 0lx, V_DD= 2.5 V

I_DD

145

200

μA

nm

Mean current consumption

ACTIVE mode, E_V= 1000lx, V_DD= 2.5 V

I_DD

170

Mean current consumption

STAND-BY mode, V_DD= 2.5 V

I_DD

2.5

Spectral range of sensitivity

λ_20%

400 ...

680

Wavelength of max. photosensitivity

Dimensions of radiant sensitive area

λ_{s max}

500

nm

0.4 x

0.4

mm x mm

L x W

I²C power up time after Vdd “ON“

t_on

40

µs

(see Appendix 1: flicker reduction and timing)

Output update time for first measurement

(see Appendix 1: flicker reduction and timing)

t_upd

Out

1

1.5

ms

Resolution of the digital output signal

(3lx ....65klx)

1

count/lx

counts

%

Digital output signal variation

for V_DD= V_{DD, min}to V_{DD, max}; E_V= 1000lx

Deviation from linear output characteristics¹⁾

± 10

f_lin

X = 100-65klx

X = 10-100lx

X = 3-10lx

±5

±10

±20

Temperature coefficient of the output signal

T_op= 0...50°C

T_op= -15...0°C & 50...70°C

(1000lx; Norm light A)

%/K

dB

TC_EV

<0.2

<0.25

Flicker reduction at the output

13

(noise frequency: 50...60Hz)

(see Appendix 1: flicker reduction and timing)

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SFH 5712

1)

The deviation of the linear output characteristic is referenced to 1000lx and follows the formula:

Y_X

1000lx

× ----------------- – 1 × 100%

⎛

⎝

⎞

------------------

f_lin

=

⎠

Y_1000lx

X

X:

Y_X:

sensor illumination level in lux

sensor output / measurement value at illumination level X

Y_1000lX: sensor output / measurement value at illumination level 1000lx

f_lin

25%

15%

5%

-5%

-15%

-25%

1

10

100

1000

10000

100000

E_V/ lx

OHF04370

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SFH 5712

V_DD

SDA

A/D

converter

Amplifier

Photo-

diode

A

D

GND

SCL

OHF04366

Figure 1

Circuitry

Pin functions

Description

V_DD

supply voltage

GND

ground

SCL

I²C bus clock serial I/O terminal (SCL)

I²C bus serial data I/O terminal (SDA)

SDA

Binning (T_A= 25 °C)

Parameter

Symbol

Value

Unit

-2

-3

Output signal

E_V= 1000lx (white LED LW 541C) Out

500...1000 800...1600 count

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SFH 5712

Relative Spectral Sensitivity

Directional Characteristics

S_rel= f (φ); T_A= 25 °C

S

_rel= f (λ); T_A= 25 °C

OHF04364

40˚

30˚

20˚

10˚

0˚

OHF04367

100

%

1.0

S_rel

50˚

V_λ

80

0.8

0.6

0.4

70

60

50

60˚

70˚

SFH 5712

40

30

20

0.2

0

80˚

90˚

10

0

100˚

400 500 600 700 800 900 nm 1100

1.0

0.8

0.6

0.4

0˚

20˚

40˚

60˚

80˚

100˚

120˚

λ

Output

Current Consumption

Out = f (E_V); T_A= 25 °C

I_DD= f (V_DD); T_A= 25 °C; V_DD= 2.5V;

ACTIVE mode

OHF04365

OHF04363

10⁵

Out

150

µA

I_dd

148

147

146

145

144

143

142

141

140

10⁴

10³

10²

10¹

10⁰

2.2

2.4

2.6

2.8

3 V 3.2

10⁰

10¹

10²

10³

10⁴lx 10⁵

V

dd

E

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SFH 5712

Appendix 1: Flicker reduction and timing

Sensor is smoothing the output signal by averaging up to 32 single measurements. Flicker caused by

artificial light sources e.g. from fluorescent lamps usually occurs at 100Hz or 120Hz. Oscillation of the

optical input signal will be reduced by 13dB at the output for sinus signals. E.g. the sensor output varation

will only be 5% of the optical input peak to peak variation from fluorescent light. The flicker reduction is

calculated by the relative variation of the optical input signal (a/A) compared to the sensor output (b/B),

see figure 2.

Average signal level of

optical input (A) and

SFH 5712 out (B)

Actual light level

SFH 5712 Out

a

b

10log [(b/B) / (a/A)]

Time

OHF04362

Figure 2 flicker reduction (average of 32 measurements)

To achieve the maximum flicker reduction performance the 32fold averaged output value should be

used. Typically 186ms (max. 250ms) after sensor activation the first full averaged signal can be read at

the sensor output. The sensor allows to read intermediate signal output values prior to 250ms (see

figure 3):

- single measurement after typ. 1ms

- average of 8 measurements after typ 45ms

- average of 16 measurements after typ 92ms

After the first full averaged measurement value (t>250ms) the output will be refreshed automatically

twice a second with 32fold averaged values. Single, 8 and 16fold averaged measurements are only

performed after activation of the sensor.

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SFH 5712

.

Operation mode

Avg. of 2^nd

32 measurements

Avg. of 8 measurements

Avg. of 32 measurements

1^stmeasurement

Avg. of 16 measurements

Output

actualisation

Delay time until sensor

can be addressed

t_upd

ACTIVE

No additional avg.

values in between

for following readings

t_on

STAND-BY

V_{dd off}

t

typ. 565 ms

max. 750 ms

typ. 186 ms

max. 250 ms

typ. 92 ms

max. 125 ms

typ. 45 ms

max. 65 ms

typ. 1 ms

max. 1.5 ms

typ. 40 µs

OHF04371

Figure 3: SFH 5712 averaging and timing

Appendix 2: Digital Interface characteristics

Interface and control is accomplished through a two-wire I²C bus serial interface. The sensor works in

multi-master/multi-slave environment, multiple devices may be connected to the same bus. The device

conforms to I²C interface specification version 3.0 Rev. 03 dated 19 June 2007.

http://www.standardics.nxp.com/support/documents/i2c/pdf/ics.bus.specification.pdf

The device implements the I²C write protocol as well as the I²C read (combined mode) protocol. In block

read mode (as slave) the device will transmit registers in a cyclic manner until master issues a stop con-

dition. E.g. if host uses block read and starts from register Ch, slave will return the following sequence

of register values:

Ch, Dh, 0h, Ah, Bh, Ch, Dh, 0h,....

until host issues a stop condition.

The address counter always increases the register address after output of register content. This is also

valid, if the device is powered down (stand-by mode) between readings.

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SFH 5712

Control of ambient light sensor modes

R/W-Register 0x80

Bit

7

6

5

4

3

2

1

0

not used

mode of ambient lightsensor

00 STAND-BY

default 00000

00 STAND-BY

11 ACTIVE

Part number and revision identification

R-Register 0x8A

Bit

7

6

5

4

3

2

1

0

Part number ID

Revision ID

1000

XXXX (start with 0001)

Manufacturer identification

R-Register 0x8B

Bit

7

6

5

3

2

Manufacturer Identification

0000

0011

Ambient light measurement data (LSB 8bit)

R-Register 0x8C

Bit

7

6

5

4

3

LSB data

00000000

default

Ambient light measurement data (MSB 8bit)

R-Register 0x8D

Bit

7

6

5

4

MSB data

00000000

default

The result of the ambient light sensor is a 16bit word split in MSB and LSB and is stored in two registers.

The upper byte data registers can only be read following a read to the corresponding lower byte register.

When the lower byte register is read, the upper byte is stored in a temporary register, which is read by a

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SFH 5712

subsequent read to the upper byte register. The upper register will contain the correct value even if ad-

ditional integration cycles end between the reading of the lower and upper registers.

Example:

LSB data and MSB data neet to be combined to a 16bit word as follows:

LSB data = 0xF0 (1111 0000)

MSB data = 0x83 (1000 0011)

-> in hex: out = 83F0 = 33776 counts

-> in binary: out= 1000 0011 combined with 1111 0000: 1000 0011 1111 0000 = 33776 counts

I2C bus address

7 bit sensor address

binary: 0101001 / hex: 29

If the I²C bus master sends a not specified register address (e.g. Eh see table 1), the device (slave) will

not send ACKNOWLEDGE and go to an idle mode and wait for another command.

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SFH 5712

Package Outlines

0.55 (0.022)

0.35 (0.014)

Pin 2

Pin 3

Bottom view

Pin 4

Pin 1

1.45 (0.057)

1.25 (0.049)

Side view

2.2 (0.087)

1.8 (0.071)

Pin 1

Package center

Pin 4

Top view

Photosensitive

area 0.16 mm²

Pin 2

Pin 3

OHPY4195

Dimensions in mm (inch)

Pin configuration

Pin #

Description

V_DD

1

2

3

4

GND

SDA

SCL

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SFH 5712

Recommended Solderpad Design

Dimensions in mm

Taping

Label

Direction of unreeling

Gurtende: 160mm

Gurtvorlauf: 400mm

Reel size: 180 mm

Quantity: 3000 pcs

Gurtende: 160 mm

Trailer: 160 mm

Trailer:

160mm

Leader:

400mm

OHAY4288

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SFH 5712

Soldering Conditions

Preconditioning acc. to JEDEC Level 3

(acc. to J-STD-020C)

Reflow Soldering Profile for lead free soldering

OHLA0687

300

Maximum Solder Profile

Recommended Solder Profile

Minimum Solder Profile

˚C

+0 ˚C

-5 ˚C

260 ˚C

255 ˚C

240 ˚C

250

T

±5 ˚C

+5 ˚C

-0 ˚C

245 ˚C

235 ˚C

217 ˚C

10 s min

200

150

100

50

30 s max

Ramp Down

6 K/s (max)

100 s max

120 s max

Ramp Up

3 K/s (max)

25 ˚C

0

50

100

150

200

250

s

300

t

Published by

OSRAM Opto Semiconductors GmbH

Leibnizstrasse 4, D-93055 Regensburg

www.osram-os.com

The information describes the type of component and shall

not be considered as assured characteristics.

Terms of delivery and rights to change design reserved. Due

to technical requirements components may contain dangerous substances. For information on the types in question

please contact our Sales Organization.

Packing

Please use the recycling operators known to you. We can also help you – get in touch with your nearest sales office.

By agreement we will take packing material back, if it is sorted. You must bear the costs of transport. For packing

material that is returned to us unsorted or which we are not obliged to accept, we shall have to invoice you for any costs

incurred.

Components used in life-support devices or systems must be expressly authorized for such purpose! Critical

components ¹, may only be used in life-support devices or systems ²with the express written approval of OSRAM OS.

¹A critical component is a component usedin a life-support device or system whose failure can reasonably be expected

to cause the failure of that life-support device or system, or to affect its safety or effectiveness of that device or system.

²Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain

and sustain human life. If they fail, it is reasonable to assume that the health of the user may be endangered.

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16


型号：	SFH-5712
厂家：	OSRAM GMBH
描述：	Hochgenauer Umgebungslichtsensor mit IÂ²C Bus Schnittstelle
文件：	总16页 (文件大小：429K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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