AS7056 AMSOSRAM | Alldatasheet
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Technical content
Tobelbader Strasse 30, 8141 Premstaetten, Austria Phone +43 3136 500-0 ams-osram.com © All rights reserved AS7056 Datasheet
Short Datasheet • PUBLIC • Document Feedback DS001052 • v5-00 • 2024-Sep-12 2 / 13 Table of contents
Short Datasheet • PUBLIC • Document Feedback DS001052 • v5-00 • 2024-Sep-12 3 / 13 AS7056 Biosignal converting unit
1 General description
The AS7056 Biosignal Sensor Analog Frontend (AFE) is the next generation Vital Sign Sensor in the ams OSRAM product family. It enables the user to detect biosignals such as photoplethysmogram (PPG) and pulse transit time (PTT), as well as proximity. PPG is the most used HRM method. It measures the pulse rate - by sampling light modulated by the blood vessels, which expand and contract as blood pulses through them. Apart from HRM/HRV, optical blood pressure and SpO2 are also enabled by the two independent working photodiode inputs of the AS7056. The AS7056 is a size and performances optimized Analog Frontend to support space-limited applications such as in-ear vital sign monitoring as well as ring applications. The AS7056 provides two LEDs and one VCSEL driver outputs, samples up to three photodiode inputs, and supports proximity detection integrated into one of the PPG signal channels. This enables high flexibility for several LED and photodiode arrangements in different applications. Furthermore, the AS7056 Biosignal Sensor Analog Frontend provides two ADC channels for simultaneous PPG measurements and an automatic photodiode offset control. The AS7056’s low-power design and small form factor are particularly well-suited for application in earbuds, fitness bands, smartwatches, sports watches, and smart patches. In these cases, board space is limited, and users look for extended, multi-day intervals between battery recharges. A thin package dimension makes the AS7056 suitable for height- constrained solutions like earbuds.
1.1 Key benefits & features
The benefits and features of AS7056, Biosignal converting unit are listed below: Table 1: Added value of using AS7056 Benefits Features Flexible LED/photodiode configuration. 2 LED + 1 VCSEL driver and 3 photodiode input pins. Allows smallest application size, e.g. in-ear vital sign monitoring Small Wafer-Level-Chip-Scale-Package (WLCSP). Enables optical blood pressure measurements. Two synchronized PPG acquisition channels.
Short Datasheet • PUBLIC • Document Feedback DS001052 • v5-00 • 2024-Sep-12 4 / 13 Benefits Features Enables proximity detection for additional energy savings Two independent, programmable sequence blocks inside the PPG signal acquisition. Good HRM measurement quality. Low noise analog optical front-end. Long operating time. Hardware sequencer to offload processor. Adjustable LED driver with current control.
1.2 Applications
- Earbuds
- Hearables
- Optical sensor platform
- Fitness band
- Smart watch
- Smart patches
- Smart rings
- Heart rate monitor
- Cuff-less optical blood pressure measurements
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1.3 Block diagram
The functional blocks of this device are shown below: Figure 1: Functional blocks of AS7056 Digital Core AS7056 Voltage References and Oscillator VCSELA VCSELS MOD 1 Current input delta-sigma
8 Bit
1.5k VCSEL Safety Protection AS7056 Analog Frontend LED Driver 2 LED Driver 3 MOD 2 Current input delta-sigma PD2 PD3 PDREF LED1 LED2 LED3 PGND INT SCL SDA VDD2 VDD GND Proximity Detection
Ordering information
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2 Ordering information
Ordering code Description Package Delivery form Delivery quantity Q65114A1331 AS7056 without ams OSRAM algorithm support WLCSP Tape & Reel 500 pcs/reel Q65114A1333 AS7056 without ams OSRAM algorithm support WLCSP Tape & Reel 10000 pcs/reel Q65114A2980 AS7056A with ams OSRAM algorithm support WLCSP Tape & Reel 500 pcs/reel Q65114A2984 AS7056A with ams OSRAM algorithm support WLCSP Tape & Reel 10000 pcs/reel
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3 Absolute maximum ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under “Operating Conditions” is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2: Absolute maximum ratings of AS7056 Symbol Parameter Min Max Unit Comments Electrical Parameters VVDD_MAX Positive supply voltage -0.3 1.98 V VDD to VSS VVDD2_MAX Analog supply voltage -0.3 1.98 V VDD2 to VSS VVCSELS_MAX VCSELS supply voltage -0.3 5.5 V VCSELS to AGND VVCSELA_MAX VCSELA pin voltage -0.3 5.5 V VCSELA to AGND VVCSELA-VCSELS Voltage difference between pins VCSELA and VCSELS -0.3 0.3 V Internal diode to VVCSELS VLED_MAX LED pin voltage -0.3 5.5 V Applicable to pins LED1, LED2 and LED3 VIN_MAX_MAX Maximum analog and digital input voltage -0.3 VVDD+0.3 V max. 1.98 V V Applicable to pins PD1, PD2, PD3, SDA and SCL. Internal ESDD protection diode to VDD pin present on analog and digital input pins. VGND-PGND Power to analog ground voltage difference -0.3 0.3 V ILED_AVER_ Average LED ON current 35 mA DC current with all LEDs ON during all 8 time slots ISCR Input current (latch-up immunity) ± 100 mA JEDEC JESD78E Electrostatic Discharge ESDHBM Electrostatic discharge HBM ± 2 kV JS-001-2017 ESDCDM Electrostatic discharge CDM ± 500 V JS-001-2017 Temperature Ranges and Storage Conditions TAMB Operating ambient temperature -30 85 °C TSTRG Storage temperature range -40 125 °C RHNC Relative humidity (non- condensing) 5 85 % MSL Moisture sensitivity level 1 According to JEDEC J-STD- 020E Represents a max. floor life time of unlimited
Electrical characteristics
Short Datasheet • PUBLIC • Document Feedback DS001052 • v5-00 • 2024-Sep-12 8 / 13 Symbol Parameter Min Max Unit Comments tSTRG DOF Storage time for DOF/Die or wafers on foil 3 months Refers to indicated date of packing (1) The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices.” The lead finish for Pb-free leaded packages is “Matte Tin” (100 % Sn)
4 Electrical characteristics
All limits are guaranteed. The parameters with Min and Max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. Conditions: TA = 25 °C, VVDD = 1.8 V; VVDD2 = 1.8 V Table 3: Electrical characteristics of AS7056 Symbol Parameter Conditions Min Typ Max Unit VVDD Supply voltage VDD pin 1.70 1.80 1.98 V VVDD2 Supply voltage VDD2 pin 1.70 1.80 1.98 V VVCSELS VCSELS supply voltage Voltage must not be below VAVDD 1.75 5.50 V Photodiode Inputs CPD Total photodiode capacitance connected to MOD1 or MOD2
0 V reverse voltage 300 pF
IPD Photocurrent input 64 µA MOD1 & MOD2 (PPG Channels) IPD Photodiode input current range Configurable ADC input full scale current range via register MODx_SEQx_IREF with 1µA step size 1 64 µA MODRES ADC resolutions of MOD1 and MOD2 20 bit fMOD_SAMPL Typical Modulator sampling frequency 0.5 25 1000 Hz
Short Datasheet • PUBLIC • Document Feedback DS001052 • v5-00 • 2024-Sep-12 9 / 13 Symbol Parameter Conditions Min Typ Max Unit CPD Total photodiode capacitance connected to PPG_ADC
0 V reserve voltage 60 300 pF
MODDAC_OFF DAC ambient light cancellation offset current full-scale range for MOD1 or MOD2 MODx_IOS_FS = 0 1 µA MODx_IOS_FS = 1 2 MODx_IOS_FS = 2 4 MODx_IOS_FS = 3 8 MODx_IOS_FS = 4 16 MODx_IOS_FS = 5 32 MODx_IOS_FS = 6 64 MODx_IOS_FS = 7 128 LED / VCSEL Driver LEDRES23 LED driver resolution Applicable to LED2 and LED3 driver 7 Bit LEDRES1 LED driver resolution Applicable to VCSEL LED1 driver 6 Bit IRANGE1 LED1 current range 20 mA VCOMP_LED1 LED1 driver compliance voltage ILED=20mA 0.3 V IRANGE23 LED2 and LED3 current range 200 mA VCOMP_LED23 LED1 and LED2 driver compliance voltage ILED=200mA 0.4 V Digital Input SCL and SDA VIH Input high Switching threshold while rising edge of the input signal is introduced 0.54 1.26 V VIL Input low Switching threshold while falling edge of the input signal is introduced 0.54 1.26 V Digital Output SDA VOH Output high Pin’s source load current is 6 mA condition: E2=E4=”1” (full available driver strength) VVDD- 0.4 V VOL Output low Pin’s sink load current is 6 mA condition: E2=E4=”1” (full available driver strength) 0.4 V
Package drawings & markings Short Datasheet • PUBLIC • Document Feedback DS001052 • v5-00 • 2024-Sep-12 10 / 13 Symbol Parameter Conditions Min Typ Max Unit Digital Output INT VOH Output high Pin’s source load current is 2 mA condition: E2=E4=”1” (full available driver strength) VVDD- 0.4 V VOL Output low Pin’s sink load current is 2 mA condition: E2=E4=”1” (full available driver strength) 0.4 V
5 Package drawings & markings
Figure 2: WLCSP package outline drawing (1) All dimensions are in millimeters. Angles in degrees. (2) Dimensioning and tolerancing conform to ASME Y14.5M-1994. (3) This package contains no lead (Pb). (4) This drawing is subject to change without notice.
Tape & reel information Short Datasheet • PUBLIC • Document Feedback DS001052 • v5-00 • 2024-Sep-12 11 / 13 Figure 3: AS7056/57 package marking/code xxxxx Tracecode
6 Tape & reel information
Figure 4: AS7056 tape dimensions
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7 Revision information
Document status Product status Definition Product Preview Pre-development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice Preliminary Datasheet Pre-production Information in this datasheet is based on products in the design, validation or qualification phase of development. The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Datasheet Production Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams-OSRAM AG standard warranty as given in the General Terms of Trade Other definitions Draft / Preliminary: The draft / preliminary status of a document indicates that the content is still under internal review and subject to change without notice. ams-OSRAM AG does not give any warranties as to the accuracy or completeness of information included in a draft / preliminary version of a document and shall have no liability for the consequences of use of such information. Short datasheet: A short datasheet is intended for quick reference only, it is an extract from a full datasheet with the same product number(s) and title. For detailed and full information always see the relevant full datasheet. In case of any inconsistency or conflict with the short datasheet, the full datasheet shall prevail. Changes from previous released version to current revision v5-00 Page Updated Figure 1 5
- Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
- Correction of typographical errors is not explicitly mentioned.
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8 Legal information
Copyright & disclaimer Copyright ams-OSRAM AG, Tobelbader Strasse 30, 8141 Premstaetten, Austria-Europe. Trademarks Registered. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Devices sold by ams-OSRAM AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of Trade. ams- OSRAM AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams-OSRAM AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams-OSRAM AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams-OSRAM AG for each application. This product is provided by ams-OSRAM AG “AS IS” and any express or implied warranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed. ams-OSRAM AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams- OSRAM AG rendering of technical or other services. Product and functional safety devices/applications or medical devices/applications: ams-OSRAM AG components are not developed, constructed or tested for the application as safety relevant component or for the application in medical devices. ams-OSRAM AG products are not qualified at module and system level for such application. In case buyer – or customer supplied by buyer – considers using ams-OSRAM AG components in product safety devices/applications or medical devices/applications, buyer and/or customer has to inform the local sales partner of ams-OSRAM AG immediately and ams-OSRAM AG and buyer and /or customer will analyze and coordinate the customer-specific request between ams-OSRAM AG and buyer and/or customer. ams OSRAM RoHS and REACH compliance statements for semiconductor products: RoHS compliant: The term “RoHS compliant” means that semiconductor products from ams OSRAM fully comply with current RoHS directives, and China RoHS. Our semiconductor products do not contain any chemicals for all 6 substance categories plus additional 4 substance categories (per amendment EU2015/863) above the defined threshold limit in the Annex II. REACH compliant: Semiconductor products from ams OSRAM are free of Substances of Very High Concern (SVHC) according Article 33 of the REACH Regulation 2006/1907/EC; please refer to the Candidate List of Substances of ECHA here. Important information: The information provided in this statement represents ams OSRAM knowledge and belief as of the date that it is provided. ams OSRAM bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. We are undertaking efforts to better integrate information from third parties. ams OSRAM has taken and will continue to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams OSRAM and its suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. Headquarters ams-OSRAM AG Tobelbader Strasse 30
8141 Premstaetten
Austria, Europe Tel: +43 (0) 3136 500 0 Please visit our website at ams-osram.com For information about our products go to Products For technical support use our Technical Support Form For feedback about this document use Document Feedback For sales offices and branches go to Sales Offices / Branches For distributors and sales representatives go to Channel Partners