TSL26717(2016) 查看數據表（PDF） - austriamicrosystems AG
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TSL26717 Datasheet PDF : 44 Pages
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TSL2671 − Principles of Operation
Figure 18:
Proximity IR LED Waveform
The LED drive current is controlled by a regulated current sink
on the LDR pin. This feature eliminates the need to use a current
limiting resistor to control LED current. The LED drive current
can be configured for 12.5 mA, 25 mA, 50 mA, or 100 mA. For
higher LED drive requirements, an external P type transistor can
be used to control the LED current.
The number of LED pulses can be programmed to any value
between 1 and 255 pulses as needed. Increasing the number of
LED pulses at a given current will increase the sensor sensitivity.
Sensitivity grows by the square root of the number of pulses.
Each pulse has a 16-μs period.
Add IR + Subtract
Background Background
LED On
LED Off
16 ms
IR LED Pulses
The proximity integration time (PTIME) is the period of time that
the internal ADC converts the analog signal to a digital count.
It is recommend that this be set to a minimum of PTIME = 0xFF
or 2.72 ms.
The combination of LED power and number of pulses can be
used to control the distance at which the sensor can detect
proximity. Figure 19 shows an example of the distances covered
with settings such that each curve covers 2X the distance.
Counts up to 64 pulses provide a 16X range.
ams Datasheet
[v1-00] 2016-Jul-12
Page 15
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