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TSL2671
DIGITAL PROXIMITY DETECTOR
TAOS118 ? JANUARY 2011
Functional Block Diagram
LDR
IR LED Constant
Current Sink
Prox Control
Upper Limit
Interrupt
INT
SCL
V DD
Prox
Integration
Prox
ADC
Prox
Data
Lower Limit
SDA
Wait Control
GND
CH0
CH1
Detailed Description
The TSL2671 light-to-digital device provides on-chip photodiodes, integrating amplifiers, ADCs, accumulators,
clocks, buffers, comparators, a state machine, and an I 2 C 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- μ s 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 I 2 C 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.
Copyright E 2011, TAOS Inc.
2
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www.taosinc.com
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The LUMENOLOGY r Company
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