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PDF VCNL4020C Data sheet ( Hoja de datos )
| Número de pieza | VCNL4020C | |
| Descripción | High Resolution Digital Biosensor | |
| Fabricantes | Vishay | |
| Logotipo |  |
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www.vishay.com
VCNL4020C
Vishay Semiconductors
High Resolution Digital Biosensor for Wearable Applications
with I2C Interface
IR anode
SDA
INT
SCL
VDD
1
2
3
4
5
22620
10 IR cathode
9 GND
8 GND
7 nc
6 nc
DESCRIPTION
The VCNL4020C is a fully integrated biosensor and ambient
light sensor. Fully integrated means that the infrared emitter
is included in the package. It has 16 bit resolution. It
includes a signal processing IC and features standard I2C
communication interface. It features an interrupt function.
APPLICATIONS
• Wearables
• Health monitoring
• Pulse oximetry
FEATURES
• Package type: surface mount
• Package form: SMD
• Dimensions (L x W x H in mm): 4.90 x 2.40 x 0.83
• Integrated modules: infrared emitter (IRED),
ambient light sensor (ALS), photo diode (PD),
and signal conditioning IC
• Interrupt function
• Supply voltage range VDD: 2.5 V to 3.6 V
• Supply voltage range IR anode: 2.5 V to 5 V
• Communication via I2C interface
• I2C bus H-level range: 1.7 V to 5 V
• Floor life: 72 h, MSL 4, according to J-STD-020
• Low stand by current consumption: 1.5 μA
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
OPTICAL BIOSENSORS FUNCTION
• Built-in infrared emitter and broader sensitivity
photodiode allows to also work with green and red LEDs
• 16 bit effective resolution ensures excellent cross talk
immunity
• Programmable LED drive current from 10 mA to 200 mA in
10 mA steps
• Excellent ambient light suppression through signal
modulation
AMBIENT LIGHT FUNCTION
• Built-in ambient light photo-pin-diode
close-to-human-eye sensitivity
• 16 bit dynamic range from 0.25 lx to 16 klx
• 100 Hz and 120 Hz flicker noise rejection
with
PRODUCT SUMMARY
PART
NUMBER
OPERATING
VOLTAGE
RANGE
(V)
I2C BUS
VOLTAGE
RANGE
(V)
VCNL4020C
2.5 to 3.6
1.7 to 5
Note
(1) Adjustable through I2C interface
LED PULSE
CURRENT (1)
(mA)
10 to 200
AMBIENT
LIGHT
RANGE
(lx)
0.25 to 16 383
SPECTRAL
BANDWIDTH
RANGE
λ0.5 (nm)
550 to 970
OUTPUT
CODE
16 bit, I2C
ADC RESOLUTION
BIOSENSOR / AMBIENT
LIGHT SENSOR
16 bit / 16 bit
Rev. 1.0, 12-Jul-16
1 Document Number: 84350
For technical questions, contact: [email protected]
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
1 page  
www.vishay.com
VCNL4020C
Vishay Semiconductors
0° 20°
1.0
0.9 40°
Vertical
0.8 Horizontal
0.7
60°
0.6
80°
0.5 0.4 0.3 0.2 0.1 0
22311
Fig. 11 - Relative Radiant Sensitivity vs. Angular Displacement
(Ambient Light Sensor)
APPLICATION INFORMATION
The digital biosensor VCNL4020C needs just one decoupling-C at VDD if connected to a regulated power supply.
IR cathode needs no external connection as the connection to the driver is done internally, but this allows also for adding
external LEDs / IREDs to the driver.
1. Application Circuit
VSMD66694
2.5 V
to
5.0 V
(2)
RED
(3)
(4)
IR
(1)
C1 C2
2.5 V
to
3.6 V
22 μF 100 nF
IR anode (1) IR cathode (10)
R1
10R C4 C3
VDD (5)
10 μF 100 nF
VCNL4020C
INT (3)
1.7 V
to
5.0 V
R2 R3 R4
GND (8, 9)
SCL (4)
SDA (2)
2.5 V
to
3.6 V
Host
Micro Controller
GPIO
I2C bus clock SCL
I2C bus data SDA
C1
470 nF
IR anode (1)
VDD (5)
VCNL4020C
INT (3)
GND (8, 9)
SCL (4)
SDA (2)
Fig. 12 - Application Circuit
(x) = Pin Number
Note
• The interrupt pin is an open drain output. The needed pull-up resistor may be connected to the same supply voltage as the application
controller and the pull-up resistors at SDA / SCL. Proposed value R2 should be >1 kΩ , e.g. 10 kΩ to 100 kΩ.
Proposed value for R3 and R4, e.g. 2.2 kΩ to 4.7 kΩ, depend also on the I2C bus speed.
For detailed description about set-up and use of the interrupt as well as more application related information see AN: “Designing
VCNL4020C into an Application”.
Rev. 1.0, 12-Jul-16
5 Document Number: 84350
For technical questions, contact: [email protected]
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
5 Page 
www.vishay.com
VCNL4020C
Vishay Semiconductors
Register #15 Biosensor Modulator Timing Adjustment
Register address = 8Fh.
TABLE 16 - BIOSENSOR MODULATOR TIMING ADJUSTMENT #15
Bit 7
Bit 6
Modulation delay time
Bit 5
Bit 4
Bit 3
Biosensor frequency
Description
Bit 2
Bit 1
Modulation dead time
Bit 0
Modulation delay time
Biosensor frequency
Modulation dead time
R/W bits. Setting a delay time between LED signal and detectors input signal evaluation.
This function is for compensation of delays from LED and photo diode. Also in respect to the possibility
for setting different proximity signal frequency. Correct adjustment is optimizing measurement signal
level. (DEFAULT = 0)
R/W bits. Setting the biosensor test signal frequency
The biosensor measurement is using a square signal as measurement signal. Four different values are
possible:
00 = 390.625 kHz (DEFAULT)
01 = 781.25 kHz
10 = 1.5625 MHz
11 = 3.125 MHz
R/W bits. Setting a dead time in evaluation of LED signal at the slopes of the signal. (DEFAULT = 1)
This function is for reducing of possible disturbance effects.
This function is reducing signal level and should be used carefully.
Note
• The settings for best performance will be provided by Vishay. With first samples this is evaluated to:
Delay time = 0; dead time = 1 and BS frequency = 00. With that register #15 should be programmed with 1 (= default value).
Register #16 Ambient IR Light Level Register
Register address = 90h.
This register is not intended to be used by customer.
3. IMPORTANT APPLICATION HINTS AND EXAMPLES
3.1 Receiver standby mode
In standby mode the receiver has the lowest current consumption of about 1.5 μA. In this mode only the I2C interface is active.
This is always valid, when there are no measurement demands executed. Also the current sink for the LED is inactive, so there
is no need for changing register #3 (LED current).
3.2 Data Read
In order to get a certain register value, the register has to be addressed without data like shown in the following scheme. After
this register addressing, the data from the addressed register is written after a subsequent read command.
Receive byte Read data from VCNL4020C
S Slave address
Wr A Register address
AP
S Slave address
Rd A
Data byte
AP
S = start condition
P = stop condition
A = acknowledge
Host action
VCNL4020C response
Fig. 14 - Send Byte / Receive Byte Protocol
The stop condition between these write and read sequences is not mandatory. It works also with a repeated start condition.
Note
• For reading out 2 (or more) subsequent registers like the result registers, it is not necessary to address each of the registers separately. After
one read command the internal register counter is increased automatically and any subsequent read command is accessing the next
register.
Rev. 1.0, 12-Jul-16
11 Document Number: 84350
For technical questions, contact: [email protected]
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet VCNL4020C.PDF ] | |
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