TSL26717(2016) 查看數據表（PDF） - austriamicrosystems AG
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TSL26717 Datasheet PDF : 44 Pages
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Detailed Description
TSL2671 − Detailed Description
The TSL2671 light-to-digital device provides on-chip
photodiodes, integrating amplifiers, ADCs, accumulators,
clocks, buffers, comparators, a state machine, and an I²C
interface. Each device combines a Channel 0 photodiode (CH0),
which is responsive to both visible and infrared light, and a
channel 1 photodiode (CH1), which is responsive primarily to
infrared light. Proximity detection can occur using either or
both photodiodes. Two integrating ADCs simultaneously
convert the amplified photodiode currents into a digital value
providing up to 16 bits of resolution. Upon completion of the
conversion cycle, the conversion result is transferred to the data
registers.
Proximity detection requires only a single external IR LED. An
internal LED driver can be configured to provide a constant
current sink of 12.5 mA, 25 mA, 50 mA, or 100 mA of current. No
external current limiting resistor is required. The number of
proximity LED pulses can be programmed from 1 to 255 pulses.
Each pulse has a 16-μs period. This LED current, coupled with
the programmable number of pulses, provides a 2000:1
contiguous dynamic range.
Communication to the device is accomplished through a fast
(up to 400 kHz), two-wire I²C serial bus for easy connection to
a microcontroller or embedded controller. The digital output of
the device is inherently more immune to noise when compared
to an analog interface.
The device provides a separate pin for level-style interrupts.
When interrupts are enabled and a pre-set value is exceeded,
the interrupt pin is asserted and remains asserted until cleared
by the controlling firmware. The interrupt feature simplifies and
improves system efficiency by eliminating the need to poll a
sensor for a proximity value. An interrupt is generated when the
value of a proximity conversion exceeds either an upper or
lower threshold. In addition, a programmable interrupt
persistence feature allows the user to determine how many
consecutive exceeded thresholds are necessary to trigger an
interrupt.
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ams Datasheet
[v1-00] 2016-Jul-12
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