TSL210

640 × 1 LINEAR SENSOR ARRAY

TAOS039D − AUGUST 2011

2

r

r

Copyright

E 2011, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

AO1

4

O

Analog output of section 1.

AO2

7

O

Analog output of section 2.

AO3

11

O

Analog output of section 3.

AO4

14

O

Analog output of section 4.

AO5

17

O

Analog output of section 5.

CLK

2

I

Clock input for all sections. The clock controls the charge transfer, pixel output, and reset.

GND

9

Ground (substrate). All voltages are referenced to the substrate.

SI1

3

I

SI1 defines the start of the data out sequence for section 1.

SI2

6

I

SI2 defines the start of the data out sequence for section 2.

SI3

10

I

SI3 defines the start of the data out sequence for section 3.

SI4

13

I

SI4 defines the start of the data out sequence for section 4.

SI5

16

I

SI5 defines the start of the data out sequence for section 5.

SO1

5

O

SO1 provides the signal to drive the SI2 input in serial mode or end of data for section 1 in parallel mode.

SO2

8

O

SO2 provides the signal to drive the SI3 input in serial mode or end of data for section 2 in parallel mode.

SO3

12

O

SO3 provides the signal to drive the SI4 input in serial mode or end of data for section 3 in parallel mode.

SO4

15

O

SO4 provides the signal to drive the SI5 input in serial mode or end of data for section 4 in parallel mode.

SO5

18

O

SO5 provides the signal to drive the SI input of another device for cascading or as an end of data indication.

VDD

1

Supply voltage for both analog and digital circuits.

Detailed Description

The device consists of five sections of 128 photodiodes (called pixels — 640 total in the device) arranged in a

linear array. Each section has its own signal input and output lines, and all five sections are connected to a

common clock line. Light energy impinging on a pixel generates photocurrent that is then integrated by the active

integration circuitry associated with that pixel.

During the integration period, a sampling capacitor connects to the output of the integrator through an analog

switch. The amount of charge accumulated at each pixel is directly proportional to the light intensity on that pixel

and the integration time. The voltage output developed for each pixel is according to the following relationship:

where:

is the analog output voltage for white condition

is the analog output voltage for dark condition

is the device responsivity for a given wavelength of light given in V/(

is the incident irradiance in

is integration time in seconds