SFH 7770
Umgebungslicht und Näherungssensor
Ambient Light and Proximity Sensor
Lead (Pb) Free Product - RoHS Compliant
2011-09-16 1
Not for design in automotive and industrial applications
Wesentliche Merkmale
• Näherungssensor
- Detektionsbereich bis 100mm
- Gestenerkennung
- Ausgänge zum Betrieb von bis zu drei IR
Emittern
- Optimiert für 850nm Emitter
- Umgebungslicht-Unterdrückung
• Umgebungslichtsensor
- 3lx - 65000lx
- Gute Linearität
- Spektrale Empfindlichkeit ähnlich dem
menschlichen Auge
•I
2C interface
- 100kHz / 400kHz und 3.4MHz Mode
- verschiedene Messmoden programmierbar
(STAND-BY, TRIGGERED, FREE-RUNNING)
•< 5 μA Stromverbrauch im STAND-BY
• Geringe Abmessungen, 2.8 x 2.8 x 0.9 mm3
Anwendungen
• Mobiltelefone
• PDA’s und Notebooks
• Kameras
• Consumer Produkte
Typ
Type
Bestellnummer
Ordering Code
SFH 7770 Q65110A9565
Features
• Proximity Sensor (PS)
- Detection-range up to 100mm
- Gesture recognition possible
- Outputs to drive up to three IR emitters
- Optimized for 850nm emitters
- Suppression of ambient light
• Ambient Light Sensor (ALS)
- 3lx - 65000lx
- High linearity
- Spectral sensitivity well matched to the human
eye
•I
2C interface
- 100kHz / 400kHz and 3.4MHz mode
- Measurement modes programmable
(STAND-BY, TRIGGERED, FREE-RUNNING)
• Current consumption < 5μA in STAND-BY
• Small package size, 2.8 x 2.8 x 0.9 mm3
Applications
• Mobile phones
• PDAs and notebooks
• Cameras
• Consumer products
SFH 7770
2011-09-16 2
Application diagram and basic informations
• The inductivity of the wire from the LED pin (1,2 or 3) to the cathode of the LED needs to be
<20nH at If=200mA (e.g. max 2 – 3cm length of a wire). The cable length may be increased for
lower currents inversely proportional to forward current: cable length ∼ 1/forward current (e.g. max 8
- 12cm at If=50mA).
• Proposed size for the pull-up resistor is 560 Ohm
• Short evaluation program
Adress Command Action
0x80 Write 03 Ambient Light Sensor in FREE-RUNNING mode
0x81 Write 03 Proximity Sensor in FREE-RUNNING mode
Wait 110 ms
0x8C Read data read LSByte data from ambient light measurement
0x8D Read data read MSByte data from ambient light measurement
0x8F Read data read data from proximity measurement LED 1
LE D 1
LED 2
LE D 3
SFH 7770 MCU
VLED=4VVDD=2.8V
100nF
pull-up
pull-up
pull-up
VIO = 1.8V
9
8
32
1
47
6
10
5
SDA
SCL
nc
INT
GND_LED
GND
Vf1
Vf1
Vf2
Vf2
Vf3
Vf3
10 µF
SFH 7770
2011-09-16 3
I2C interface
• 1.8V IO-logic level for SDA and SCL
• I/O-pins are open drain type and logic high level is set with external pull-up resistor
• SFH 7770 operates always as slave, address is 0x38.
• Designed for the I2C-modes: Standard (100kHz), Fast (400kHz) and High Speed (3.4MHz)
• Combined format (see I2C Bus specification UM10204 from NXP) for data reading
• Block READ and WRITE modes are available. In these modes several registers can be read or written
during single I2C traffic period. The register values are provided in a cyclic manner until master sends
the stop condition. E.g. if master uses block read and starts from register 0x8C, the slave returns
following register values: 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, 0x93, 0x94 and so on until the
master sends stop condition.
• Interrupt pin (INT): open-drain output (like SDA and SCL)
Analog / amplifi er
digital
+
data-
register
proximity ambient
light
I2C
LED
driver
9
8
SDA
SCL
3
2
1
47
6
10
5INT
LED 1
LED 2
LED 3
GND_LEDGND
nc
VDD
SFH 7770
2011-09-16 4
Measurement modes
If VDD exceeds the threshold-voltage, the sensor will switch from OFF to STAND-BY mode. As shown
in the transition diagram above it is possible to switch between all modes without any restriction. The
transition time between modes (ttrans) is < 10ms. The delay time between STAND-BY and start of
measurement is max. 10ms for the Ambient Light Sensor.
OFF IDD is below 2μA and the device is inactive. Other units may use the I2C bus without
any restrections; I/O pins and INT are in a high Z state. There is no sink current
through the LEDs.
STAND-BY This is the initial mode after power-up. IDD is below 5μA. No measurement is
performed. Device can be activated by I2C bus communication. Data registers can
be read and written. The data will be stored in the registers when the device goes
from TRIGGERED or FREE-RUNNING to STAND-BY.
TRIGGERED Every measurement is separately initiated by MCU. This mode can be used for
Ambient Light Sensor and Proximity Sensor. Measurement data are available in the
registers after a defined delay time.
FREE-RUNNING Measurements are triggered internally by SFH7770. This mode can also be used
for Ambient Light Sensor and Proximity Sensor. Measurement repetition rate and
current through the LEDs are defined by the MCU. Measurement results can be
read from the data register, the status from the interrupt register.
FREE-RUNNING
TRIGGERED
STAND_BY
FREE-RUNNING
TRIGGERED
STAND-BY
OFF
Ambientlight
Sensor
(ALS)
Proximity
Sensor
(PS)
FREE-RUNNING
TRIGGERED
STAND_BY
FREE-RUNNING
TRIGGERED
STAND-BY
OFF
Ambientlight
Sensor
(ALS)
Proximity
Sensor
(PS)
SFH 7770
2011-09-16 5
Maximum limits
Operating conditions
Parameter Symbol Value Unit
min. typ. max.
Storage temperature Tstg – 40 + 85 °C
Supply voltage
(between VDD and GND)
VDD - 0.3 + 4.5 V
Maximum Voltage of SDA, SCL and INT to GND Vdig - 0.3 + 3.6 V
Maximum Voltage of LED1 ... LED3 to GND_LED VLED - 0.3 + 5.5 V
Maximum Voltage between GND and GND_LED VLED -500 +500 mV
Electrostatic discharge
- Human Body Model
(according to JESD22-A114-E; Class2 )
ESD 2kV
Parameter Symbol Value Unit
min. typ. max.
Operation temperature Top - 20 + 85 °C
Supply Voltage VDD 2.3 3.1 V
Ripple on Supply Voltage
(VDD = 2.35 - 3.05V, DC ... 100MHz)
VDD,rip 10 mV
Voltage for I/O (SDA, SCL, INT)1)
1) The limits for the logic levels of SCL and SDA pins are in accordance with the I²C bus specification from NXP
(UM10204 „I²C bus specification and user manual“, Rev. 03 - 19 June 2007). The same limits are valid for the logic
levels of the interrupt pin (INT): the maximum level for logic „LOW“ level is 30% of the I/O voltage VIO, the minimum
level for logic „HIGH“ level is 70% of the I/O voltage VIO.
VIO 1.6 2.0 V
extended Voltage range for I/O (SDA, SCL, INT)2)
2) Extended voltage range for I²C bus communication is only valid for standard- and fast-mode. Input levels are
internally referenced to 1.8V. So „LOW“ level threshold is 30% of 1.8V and „HIGH“ level threshold is 70% of 1.8V
regardless of the external I/O voltage VIO. Operating at VIO>2.0V can lead to minor timing violations to the I²C bus
specification from NXP concerning the minimum/maximum hold time requirement.
VIO,ext 1.6 3.1 V
Supply Voltage LED VLED 2.3 4.25 V
Ripple VLED DC... 30kHz
30kHz ... 100MHz
VLED,rip 500
200
mV
mV
SFH 7770
2011-09-16 6
Characteristics (Ta = 25°C)
1) Start-up sequence
The threshold limit where the device switches from OFF to STAND-BY is between VDD =1.4V and
VDD =2.0V. Within 0.2s after exceeding the threshold voltage the device will switch from OFF to
STAND-BY mode.
Parameter Symbol Value Unit
min. typ. max.
General
Conditions for OFF mode 1) VDD,off 1.4 V
On-time (from OFF to STAND-BY) 1) ton 0.2 s
Threshold level for STAND-BY mode 1) VDD,on 2.0 V
Transition time between modes
(STAND-BY ...TRIGGERED ...FREE-RUNNING)
ttrans 10 ms
STAND-BY mode current consumption IDD,stby 5μA
OFF mode current consumption IDD,off 2μA
time
VDD
1.4V
2.0V upper threshold limit
lower threshold llimit
OFFMODE: undefined STAND-BY undefined STAND-BY
ton
<0.2s ton
<0.2s
time
VDD
1.4V
2.0V upper threshold limit
lower threshold llimit
OFFMODE: undefined STAND-BY undefined STAND-BY
ton
<0.2s ton
<0.2s
SFH 7770
2011-09-16 7
Characteristics (Ta = 25°C)
2) Output signal of the Proximity Sensor
The sensitivity range of the Proximity Sensor is typ. 100 µW/cm2 to 1.0 mW/cm2 . Within this range, the
data in the SFH 7770 output register are available in an approximately logarithmic scale. The advantage
of the logarithmic scale is the possibility to cover a large range of distance without changing the
sensitivity settings of the sensor. In addition the data are then approximately proportional to the distance
of an object.
When the irradiation is below 100 µW/cm², the PS output signal exhibits noise which is typically below
80 output counts (see the dashed line in the graph below).
For irradiation higher than typ. 100µW/cm², the PS output signal increases monotonically up to a value
of typ. 163.
Parameter Symbol Value Unit
min. typ. max.
Proximity Sensor (PS)
Wavelength of max. sensitivity
λ
S,max 850 nm
Spectral range of sensitivity (50% of Smax)
λ
S,50% 750 ...
1000
nm
Sensitivity range,
λ
= 850nm 2) Ee0.09 ...
1.6
mW/cm²
Sensor signal (logarithmic) 2) 0 ... 254 counts
Measurement accuracy for irradiance Ee,
λ
=850nm at Ee=500µW/cm²
- 6 + 6 dB
LED pulse current, programmable,
( only when VLED - Vf1, f2, f3 > 0.4V)1)
1) DC-offset of 0.5mA has to be added to LED current consumption during LED burst
ILED,PP 5.5 200 mA
Accuracy of LED pulse current
Δ
ILED,PP -20 +20 %
Mean current consumption, FREE-RUNNING
( one LED „ON“, If=100mA, trep = 100ms)
Iact 300 µA
Modulation frequency of LED current fmod 667 kHz
Repeat frequency in FREE-RUNNING mode
(programmable)
trep 10 ...
2000
ms
Length of a single LED burst tburst 300 µs
Length of a measurement cycle for 3 LEDs t1ms
Update of register data after MCU request t10 ms
Sunlight suppression 50 klx
SFH 7770
2011-09-16 8
When the irradiation is higher than 1 mW/cm², the PS output signal steps up to a value of 254 output
counts.
The proximity signal is converted to a 8 bit signal. When the irradiation is 500 µW/cm² the output is
typically 137 (1010 0011). More details on the characteristics of the Proximity Sensor can be seen below.
50
100
150
200
250
300
0,01 0,1 1 10
Ee (m W/ cm2 )
PS signal (counts)
SFH 7770
2011-09-16 9
Characteristics (Ta = 25°C)
Parameter Symbol Value Unit
min. typ. max.
Ambient Light Sensor (ALS)
Wavelength of max. sensitivity
λ
S max 555 nm
Spectral range of sensitivity (10% of Smax)
λ
S10% 480-660 nm
Measurement range 365000 counts
Sensitivity (1000lx) Out 0.6 11.5 count/lx
Deviation from linear output characteristics1)
X = 100-65000lx
X = 10-100lx
X = 3-10lx
1) The deviation of the linear output characteristic is referenced to 1000lx and follows the formula:
X: sensor illumination level in lux
YX: sensor output / measurement value at illumination level X
Y1000lX: sensor output / measurement value at illumination level 1000lx
flin ±5
±10
±30
%
Temperature coefficient for EV measurement
0°C ... 50°C
-15°C ... 70°C
TcEv
- 0.20
- 0.25
+ 0.20
+ 0.25
%/K
%/K
Update of register data after MCU request t100 ms
Measurement repetition rate in FREE-RUNNING
mode, programmable
trep 100 ...
2000
ms
Mean current consumption in FREE-RUNNING
mode, trep = 500ms
Iact 200 µA
Current consumption in STAND-BY mode Istby 5µA
Error by Flicker noise
(caused by bulbs or fluorescent lamps)
(f = 50 or 60Hz, 100% modulation)
-5 +5 %
flin
YX
Y1000lx
------------------ 1000lx
X
------------------1–×
⎝⎠
⎛⎞
100%×=
SFH 7770
2011-09-16 10
SW reset (Bit 3 „H“) starts sets all registers to default (same as POWER UP). Set back to „L“ by SFH7770
automatically.
Software reset and control of the Ambient Light Sensor
R/W-Register 0x80
Bit 7 6 5 4 3 2 1 0
not used complete SW reset mode of Ambient Light Sensor
default 00000 0 00 STAND-BY
1 SW reset 00 STAND-BY
01 STAND-BY
10 TRIGGERED (by MCU)
11 FREE-RUNNING (internally triggered)
Control of the Proximity Sensor
R/W-Register 0x81
Bit 7 6 5 4 3 2 1 0
not used mode of Proximity Sensor
default XXXXXX 00 STAND-BY
00 STAND-BY
01 STAND-BY
10 TRIGGERED by MCU
11 FREE-RUNNING (internally triggered)
SFH 7770
2011-09-16 11
Emitter current setting
Emitter current setting
R/W-Register 0x82
Bit 7 6 5 4 3 2 1 0
activation of LEDs setting LED2 pulse current setting LED1 pulse current
default 00 011 50 mA 011 50 mA
00 LED1 active 000 5 mA 000 5 mA
01 LED1 and 2 active 001 10 mA 001 10 mA
10 LED1 and 3 active 010 20 mA 010 20 mA
11 all LEDs active 011 50 mA 011 50 mA
100 100 mA 100 100 mA
101 150 mA 101 150 mA
110 200 mA 110 200 mA
R/W-Register 0x83
Bit 7 6 5 4 3 2 1 0
not used setting LED3 pulse current
default XXXXX 011 50 mA
000 5 mA
001 10 mA
010 20 mA
011 50 mA
100 100 mA
101 150 mA
110 200 mA
SFH 7770
2011-09-16 12
MCU-triggered measurement (for Ambient Light Sensor and Proximity Sensor)
If „1“ is set, a new measurement will start after the I2C stop commmand from the MCU. As soon as the
measurement is finished, the corresponding bit of the register will be set to „0“ automatically by the
SFH7770.
Proximity measurement: time interval settings (repetition time) for FREE-RUNNING mode
R/W-Register 0x84
Bit 7 6 5 4 3 2 1 0
not used trigger ambient light trigger proximity
default XXXXXX 1 1
R/W-Register 0x85
Bit 7 6 5 4 3 2 1 0
not used time-interval
default XXXX 0101 100 ms
0000 10 ms
0001 20 ms
0010 30 ms
0011 50 ms
0100 70 ms
0101 100 ms
0110 200 ms
0111 500 ms
1000 1000 ms
1001 2000 ms
SFH 7770
2011-09-16 13
Ambient light measurement: time interval settings (repetition time) for FREE-RUNNING mode
Part number and revision Identification
Manufacturer Identification
R/W-Register 0x86
Bit 7 6 5 4 3 2 1 0
not used time-interval
default XXXXX 010 500 ms
000 100 ms
001 200 ms
010 500 ms
011 1000 ms
100 2000 ms
R-Register 0x8A
Bit 7 6 5 4 3 2 1 0
Part number ID Revision ID
1001 XXXX (start with 0000)
R-Register 0x8B
Bit 7 6 5 4 3 2 1 0
Manufacturer Identification
0000 0011
SFH 7770
2011-09-16 14
Ambient Light measurement data (0x8C: LSB , 0x8D: MSB )
The result of the Ambient Light Sensor is a 16bit word with MSB and LSB and is stored in two registers..
The binary data can be converted directly to decimal „lx“ values (max. 65535lx)
Status of measurement data for Ambient Light Sensor (ALS) and Proximity Sensor (PS)
When the measurement data are available in the register, the corresponding status bit (bit 6 for
ambient-light; bit 4, 2 and 0 for proximity) in register 0x8E is set to „1“. When the measurement data
have been read by the MCU, the status bit is automatically set back to „0“.
Bit 7 is set „1“ when the measured ALS value is outside the threshold level settings (register 0x96...
0x99). Bit 1, 3 and 5 are set when the measured PS value is above the threshold level (register 0x93...
0x95).
The status of register 0x8E will always be updated when a new measurement is available.
Proximity measurement data (LED 1 , 8bit, logarithmic)
R-Register 0x8C
Bit 7 6 5 4 3 2 1 0
LSB data
default 00000000
R-Register 0x8D
Bit 7 6 5 4 3 2 1 0
MSB data
default 00000000
R-Register 0x8E
Bit 7 6 5 4 3 2 1 0
ALS
threshold
ALS
data
PS LED3
threshold
PS LED3
data
PS LED2
threshold
PS LED2
data
PS LED1
threshold
PS LED1
data
default 00000000
R-Register 0x8F
Bit 7 6 5 4 3 2 1 0
data
default 00000000
SFH 7770
2011-09-16 15
Proximity measurement data (LED 2 , 8bit, logarithmic)
Proximity measurement data (LED 3 , 8bit, logarithmic)
Interrupt register / INT output.
In Bit6/5 the source which triggers the interrupt is noted. Data from the status register (0x8E) are used.
In latched mode (set by bit3) this remains unchanged until the Interrupt register has been read by the
MCU, afterewards it is set to 0 automatically. In unlatched mode it is updated after every measurement.
The output polarity (pin 5 of the SFH7770) can be changed by bit 2.
The interrupt can be triggered by the Ambient Light Sensor and / or by the Proximity Sensor; this can
be set by the Interrupt mode (bit 1/bit 0). When bit 1 and bit 0 is set to 0, the INT output is in the high Z
state (high impedance).
R-Register 0x90
Bit 7 6 5 4 3 2 1 0
data
default 00000000
R-Register 0x91
Bit 7 6 5 4 3 2 1 0
data
default 00000000
R/W-Register 0x92
Bit 7 6 5 4 3 2 1 0
not
used
Interrupt
trigger source
not
used
Output mode Output
polarity
Interrupt mode
(triggered by..)
R/W not
used
R only not
used
R/W R/W R/W
default X00 X 1 0 00
00 ALS 0 latched 0 active L 00 Z state
01 PS (LED 1) 1 not latched 1 active H 01 only PS
10 PS (LED 2) 10 only ALS
11 PS (LED 3) 11 PS and ALS
SFH 7770
2011-09-16 16
Threshold level for Proximity Sensor (LED 1)
Threshold level for Proximity Sensor (LED 2)
Threshold level for Proximity Sensor (LED 3)
Upper threshold level for Ambient Light Sensor (LSB)
RW-Register 0x93
Bit 7 6 5 4 3 2 1 0
data
default 11111111
RW-Register 0x94
Bit 7 6 5 4 3 2 1 0
data
default 11111111
RW-Register 0x95
Bit 7 6 5 4 3 2 1 0
data
default 11111111
RW-Register 0x96
Bit 7 6 5 4 3 2 1 0
LSB data (upper threshold)
default 11111111
SFH 7770
2011-09-16 17
Upper threshold level for Ambient Light Sensor (MSB)
Lower threshold level for Ambient Light Sensor (LSB)
Lower threshold level for Ambient Light Sensor (MSB)
RW-Register 0x97
Bit 7 6 5 4 3 2 1 0
MSB data (upper threshold)
default 11111111
RW-Register 0x98
Bit 7 6 5 4 3 2 1 0
LSB data (lower threshold)
default 00000000
RW-Register 0x99
Bit 7 6 5 4 3 2 1 0
MSB data (lower threshold)
default 00000000
SFH 7770
2011-09-16 18
Package Outlines
Maße in mm/ Dimensions in mm
Pin 1 identifier: one additional yellow pad in the edge, visible in front view
SFH 7770
2011-09-16 19
Gurtung / Polarität und Lage Verpackungseinheit 3000/Rolle, ø180 mm
Method of Taping / Polarity and Orientation Packing unit 3000/reel, ø180 mm
Maße in mm (inch) / Dimensions in mm (inch).
Tape dimensions in mm (inch)
Reel dimensions in mm (inch)
W P0P1P2D0E F
8 +0.3 / -0.1 4 ± 0.1
(0.157 ± 0.004)
4 ± 0.1
(0.157 ± 0.004)
2 ± 0.05
(0.079 ± 0.002)
1.5 + 0.1
(0.059 + 0.004)
1.75 ± 0.1
(0.069 ± 0.004)
3.5 ± 0.05
(0.138 ± 0.002)
A W Nmin W1W2 max
180 (7) 8 (0.315) 60 (2.362) 8.4 + 2 (0.331 + 0.079) 14.4 (0.567)
D
0
2
P
P
0
1
P
W
FE
Direction of unreeling
N
W
1
2
W
A
OHAY0324
Label
Gurtvorlauf:
Leader:
Trailer:
Gurtende:
13.0
Direction of unreeling
±0.25
160 mm
160 mm
400 mm
400 mm
SFH 7770
SFH 7770
2011-09-16 20
Recommended solderpad design
Maße in mm/ Dimensions in mm
Lötbedingungen Vorbehandlung nach JEDEC Level 3
Soldering Conditions Preconditioning acc. to JEDEC Level 3
Reflow Lötprofil für bleifreies Löten (nach J-STD-020-D.01)
Reflow Soldering Profile for lead free soldering (acc. to J-STD-020-D.01)
0.7
0.5
2.8
2.8
0.7
2.6
1.05
0
50
100
150
200
250
T
˚C
S
t
t
P
t
T
p
240 ˚C
217 ˚C
245 ˚C
25 ˚C
L
SFH 7770
2011-09-16 21
Pb-Free (SnAgCu) Assembly
Profile Feature Recommendation Max. Ratings
Ramp-up Rate to Preheat*)
25°C to 150°C
2°C / sec 3°C / sec
Time ts from TSmin to TSmax
(150°C to 200°C
100s min. 60sec max. 120sec
Ramp-up Rate to Peak*)
TSmax to TP
2°C / sec 3°C / sec
Liquidus Temperture TL217°C
Time tL above TL80sec max. 100sec
Peak Temperature TP245°C max. 260°C
Time tP within 5°C of the specified peak
temperature TP - 5K
20sec min. 10sec max. 30sec
Ramp-down Rate*
TP to 100°C
3°C / sec 6°C / sec maximum
Time 25°C to Peak temperature max. 8 min.
All temperatures refer to the center of the package, measured on the top of the component
* slope calculation ΔT/Δt: Δt max. 5 sec; fulfillment for the whole T-range
SFH 7770
2011-09-16 22
Published by
OSRAM Opto Semiconductors GmbH
Leibnizstr. 4, D-93055 Regensburg
www.osram-os.com
© All Rights Reserved.
The information describes the type of component and shall not be considered as assured characteristics. Due to the
special conditions of the manufacturing processes of Sensor, the typical data or calculated correlations of technical
parameters can only reflect statistical figures. These do not necessarily correspond to the actual parameters of each
single product, which could differ from the typical data and calculated correlations or the typical characteristic line. If
requested, e.g. because of technical improvements, these typ. data will be changed without any further notice.
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 2 with the express written approval of OSRAM OS.
1 A 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.
2 Life 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.
