TMD27721 datasheet(16/60 Pages) OSRAM

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ams Datasheet

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[v1-21] 2016-Feb-16

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TMD2772/ TMD2772WA − Detailed Description

The 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 one photodiode (CH0), which is responsive to both

visible and infrared light, and a second photodiode (CH1),

which is responsive primarily to infrared light. Two integrating

ADCs simultaneously convert the amplified photodiode

currents to a digital value providing up to 16-bits of resolution.

Upon completion of the conversion cycle, the conversion result

is transferred to the Ch0 and Ch1 data registers. This digital

output can be read by a microprocessor where the luminance

(ambient light level in lux) is derived using an empirical formula

to approximate the human eye response.

Figure 21:

Detailed Block Diagram of TMD2772/TMD2772WA

A fully integrated proximity detection solution is provided with

an 850-nm IR LED, LED driver circuit, and proximity detection

engine. An internal LED driver pin (LDR) is externally connected

to the LED cathode (LEDK) to provide a controlled LED sink

current. This is accomplished with a proprietary current

calibration technique that accounts for all variances in silicon,

optics, package, and most important, IR LED output power. This

eliminates or greatly reduces the need for factory calibration

that is required for most discrete proximity sensor solutions.

The device is factory calibrated to achieve a proximity count

Detailed Description

Wait Control

Interrupt

Lower Limit

Upper Limit

Lower Limit

Upper Limit

INT

SCL

SDA

LEDA

LEDK

TMD2772

Channel 0

Channel 1

LDR

VDD

CH0 ADC

CH1 ADC

CH0 Data

CH1 Data

ALC Control

Prox Data

Prox ADC

Prox

Integration

Prox Control

IR LED Constant

Current Sink

GND

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