AS7057 AMSOSRAM | Alldatasheet
Document overview
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Technical content
v1-00 • 2022-May-10
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7 Soldering & Storage Information 11
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1 General Description
The AS7057 Biosignal Sensor Analog Frontend (AFE) is the next generation Vital Sign Sensor. 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 AS7057. The AS7057 is a size and performance optimized analog frontend to support space-limited applications such as in-ear vital sign monitoring. The AS7057 provides three LED 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 AS7057 Biosignal Sensor Analog Frontend provides two ADC channels for simultaneous PPG measurements and an automatic photodiode offset control. The AS7057’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 AS7057 suitable for height-constrained solutions like earbuds.
1.1 Key Benefits & Features
The benefits and features of the AS7057 Biosignal Converting Unit are listed below: Figure 1: Added Value of Using AS7057 Benefits Features Flexible LED/photodiode configuration. Three LED drivers and three photodiode input pins. Allows the 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. 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 frontend. Long operating time. Hardware sequencer to offload processor. Adjustable LED driver with current control.
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1.2 Applications
- Earbuds
- Hearables
- Optical sensor platform
- Fitness band
- Smart watch
- Smart patches
- Heart rate monitor
- Cuff-less optical blood pressure measurements
1.3 Block Diagram
The diagram below shows the functional blocks of this device: Figure 2: Functional Blocks of AS7057 PPG 20 bits ADC PD MUX 3 x LED Driver FIFO SEQ I2C CTRL PD1 PD2 AS7057 INT LED1 LED2 LED3 SCL SDA PD3 PPG 20 bits ADC Proximity
Ordering Information
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2 Ordering Information
Ordering Code Package Marking Delivery Form Delivery Quantity AS7057-BWLM WLCSP n.a. Tape & Reel 500 pcs/reel AS7057-BWLT WLCSP n.a. 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. Figure 3 Symbol Parameter Min Max Unit Comments Electrical Parameters VDD Supply Voltage 1.98 V VIN Input Pin Voltage to Ground pins -0.3 VDD+0.3V max. 1.98 V V Internal diode to VDD VLED Voltage at Driver -0.3 5.5 V VGND-PGND Analog to Power Ground Voltage Difference ±0.3 V ISCR Input Current (latch-up immunity) ±100 mA Norm: JEDEC JESD78 Connect the specified capacitor on PDREF during latch-up test. ILEDON Average LED ON Current 90 mA DC current with all LEDs ON during all 8 time slots Electrostatic Discharge ESDHBM Electrostatic Discharge HBM ±2.0 kV JS-001-2017 Temperature Ranges and Storage Conditions TSTRG Storage Temperature Range -40 125 °C JESD22-A103 TAMB Operating Free-air Temperature -30 85 °C RHNC Relative Humidity (non-condensing) 5 85 % MSL Moisture Sensitivity Level 1 Maximum floor life time unlimited @ 30°C/85% RHmax (1) The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for Non-hermetic Solid State Surface Mount Devices.”
Electrical Characteristics
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4 Electrical Characteristics
All limits are guaranteed at an ambient temperature of 25 °C. The parameters with Min and Max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. Figure 4: Symbol Parameter Conditions Min Typ Max Unit VDD Supply voltage 1.7 1.8 1.98 V IVDD Supply current in power down mode 1.1 µA Supply current in idle mode 2.92 µA Supply current PPG ADC active One subsample, one modulator @25 SpS; enabled Stand-by Mode 10 60 µA fSampling Sampling frequency 0.5 25 1000 Hz Photodiode IOS DAC offset current full scale range FSR 0 1 µA FSR 1 2 FSR 2 4 FSR 3 8 FSR 4 16 FSR 5 32 FSR 6 64 FSR 7 128 CPD Total photodiode capacitance connected to PPG_ADC
0 V reserve voltage 60 300 pF
IPD Photo current input (∑ signal range 1 µA- 64 µA) 0 64 µA LED Driver VLED LED pad voltage 5 V LED Driver 1-3 ILED Allowed operating LED output current 200.00 mA
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5 Package Drawings & Markings
Figure 5: (1) All dimensions are in micrometers. Angles in degrees. (1) Dimensions and tolerances conform to ASME Y14.5M-1994. (2) This package contains no lead (Pb). (3) This drawing is subject to change without notice.
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6 Tape & Reel Information
Figure 6: Tape Dimensions
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7 Soldering & Storage Information
Figure 7: Solder Reflow Profile Graph Figure 8: Solder Reflow Profile Parameter Reference Device Average temperature gradient in preheating 2.5 °C/s Soak time tsoak 2 to 3 minutes Time above 217 °C (T1) t1 Max 60 s Time above 230 °C (T2) t2 Max 50 s Time above Tpeak – 10 °C (T3) t3 Max 10 s Peak temperature in reflow Tpeak 260 °C Temperature gradient in cooling Max −5 °C/s
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8 Revision Information
Changes from previous version to current revision v1-00 Page This short datasheet is derived from v1-00 of full datasheet all
- 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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9 Legal Information
Copyrights & 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. RoHS Compliant & ams Green Statement RoHS Compliant: The term RoHS compliant means that ams-OSRAM AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories plus additional 4 substa nce categories (per amendment EU 2015/863), including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead -free processes. ams Green (RoHS compliant and no Sb/Br/Cl): ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) and do not contain Chlorine (Cl not exceed 0.1% by weight in homogeneous material). Important Information: The information provided in this statement represents ams-OSRAM AG knowledge and belief as of the date that it is provided. ams-OSRAM AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams-OSRAM AG has taken and continues 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 AG and ams-OSRAM AG 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 www.ams.com Buy our products or get free samples online at www.ams.com/Products Technical Support is available at www.ams.com/Technical-Support Provide feedback about this document at www.ams.com/Document-Feedback For sales offices, distributors and representatives go to www.ams.com/Contact For further information and requests, e-mail us at ams_sales@ams.com