Document
Datasheet
DS000692
TMF8805
Time-of-Flight Sensor
v4-00 • 2021-Jul-08
Abstract
The TMF8805 is a dToF (direct time of flight) optical distance sensor module achieving up to 2500mm target detection distance.
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TMF8805 Content Guide
Content Guide
1
General Description ...................... 3 8.5
INT_STATUS Register (Address 0xE1) .....22
8.6
INT_ENAB Register (Address 0xE2)..........23
1.1
Key Benefits & Features............................... 3
8.7
ID Register (Address 0xE3)........................23
1.2
Applications .................................................. 4
8.8
REVID Register (Address 0xE4) ................24
1.3
Block Diagram .............................................. 4
8.9
App0 Registers – appid=0xC0....................24
2
Ordering Information .................... 5 8.10 Bootloader Registers – appid=0x80 ...........52
3
Pin Assignment ............................. 6 9
Application Information............... 56
3.1 3.2
Pin Diagram.................................................. 6 Pin Description ............................................. 6
9.1 9.2 9.3
SPAD Options ............................................56 Reference SPAD, TDC and Histogram ......57 Schematic ...................................................58
4
Absolute Maximum Ratings ......... 8 9.4
PCB Layout ................................................60
9.5
PCB Pad Layout .........................................61
5
Electrical Characteristics ............. 9
10 Package Drawings & Markings... 62
5.1
Recommended Operating Conditions .......... 9
6
Typical Operating
11 Tape & Reel Information.............. 63
Characteristics .............................10 12 Soldering & Storage Information 64
7
Functional Description ................13 12.1 Soldering Information .................................64
12.2 Storage Information ....................................65
7.1
I²C Protocol................................................. 13
7.2
System Parameters .................................... 13
13
Laser Eye Safety .......................... 67
7.3 7.4
I/O ............................................................... 14 Power Consumption ................................... 15
14
Revision Information ................... 68
7.5
Timing......................................................... 16 15
Legal Information......................... 69
7.6
Algorithm Performance............................... 17
7.7
VCSEL ........................................................ 19
7.8
Typical Optical Characteristics ................... 19
8
Register Description ....................21
8.1
APPID Register (Address 0x00)................. 21
8.2
APPREV_MAJOR Register (Address
0x01)........................................................... 21
8.3
APPREQID Register (Address 0x02) ......... 21
8.4
ENABLE Register (Address 0xE0) ............. 22
Datasheet • PUBLIC DS000692 • v4-00 • 2021-Jul-08
69 │ 2
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TMF8805 General Description
1 General Description
The TMF8805 is a time-of-flight (TOF) sensor in a single modular package with associated VCSEL. The TOF device is based on SPAD, TDC and histogram technology. The device achieves 2500 mm detection range.
1.1
Key Benefits & Features
The benefits and features of TMF8805, Time-of-Flight Sensor, are listed below:
Figure 1: Added Value of Using TMF8805
Benefits
Features
Small footprint fits in the mobile phone bezel
Detecting central closest objects
Within 5 % of measurement (accuracy); no multipath and no multiple object problems as for iToF
Better accuracy detects reliably closest object Minimum distance 20 mm Maximum distance 2500 mm
No complex calibration
Compensates for dirt on glass
Improved accuracy over temperature and life
Make better decisions
Class 1 Eye Safe
Longer battery life
Modular package - 2.2 mm x 3.6 mm x 1.0 mm No influence on multi object reflections Time-to-Digital Converter (TDC) Direct Time-of-Flight Measurement
Single Photon Avalanche Photodiode (SPAD) Histogram based architecture
Dynamic cover glass calibration Reliable Operation under demanding use cases Reference SPAD Distance and signal quality reported Fast VCSEL driver with protection 27 mA power consumption at 30 Hz operation 0.26 µA power-down current consumption (EN=0)
Datasheet • PUBLIC DS000692 • v4-00 • 2021-Jul-08
69 │ 3
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TMF8805 General Description
1.2
Applications
The device is ideal for use in the mobile phone market with applications including:
● Distance measurement for camera autofocus (Laser Detect Autofocus - LDAF) ● Supporting low-power system operation by enabling high-power components (i.e. 3D camera)
only when an object is in the detection range ● Presence detection - Object detection ● Collision avoidance
1.3
Block Diagram
The functional blocks of this device are shown below:
Figure 2: Functional Blocks of TMF8805
Host
EN
GPIO1 IN.