Datasheet

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[v1-08] 2020-Jun-29 Document Feedback
TMF8701 − Detailed Description
The operating modes have different timings as shown in
following table:
Figure 17:
Algorithm Timings
Proximity Mode
The proximity algorithm reports a distance information in steps
of 1mm and the detect/release threshold can be tuned inside
the host. It especially can detect objects close to touch. For
proper operation of the proximity mode a cover glass with IR
ink is assumed.
Figure 18:
Proximity Mode Parameters
Note(s):
1. On the DUT or on the target; for close distances the target will shield ambient light.
2. 14k halogen light represents 100k sunlight equivalent
3. To detect a target at close distances, the algorithm relies on historical information. Therefore a grey or white target had to be present
previously at approximately 60mm for obtaining this information.
4. These exact numbers apply for a 18% reflectivity target; due to the short distance a full FOV object perpendicular to TMF8701 is
assumed.
Condition Min Nom Max Units
Proximity Mode only
command=0x02 or 0x03
cmd_data6=0x81
5.3 ms
Proximity and Distance
Mode Combined
command=0x02 or 0x03
cmd_data6=0xA3
16.6 ms
Condition Min Nom Max Units
Reflectivity of Object at
940nm
Full FOV target assumed 5 90 %
Ambient Light
Halogen light
(1)
0
14k
(2)
lux
Object Detected
1.0
(3)
20
(4)
mm
Object Released
60
(4)
mm
Difference Object Detected /
Object Released
Appropriate but fixed
thresholds for detect /
release in the host
assumed
10 mm