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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 32

The calculation of the input light irradiance by Equation 4 is more precise than the result of Equation 3

because the tolerances of the clock frequency fCLK, are eliminated. The irradiance responsivity Re, and

internal conversion time TCONV are determined by the content of register bits CREG1:GAIN and

CREG1:TIME (see Figure 48). Their values directly determine the sensitivity, the LSB value, and the

full-scale range (FSR) of the detectable irradiance, Ee, of the A/D conversion.

Information

The values in the Figure 27 up to Figure 32 are calculations based on the general sensitivity

without any influences of system and opto-mechanical setup. These values are only an indication

for the sensor configuration.

Figure 27:

UVA-

Channel (λ = 315 nm – 410 nm) Programmable FSR and LSB of the Detectable Input Light

Irradiance Ee

TIME(1)

NCLK

(1)

1024

2048

4096

8192

16384

32768

65536

131072

TCONV[ms]

(1)

128

RESOL[bit]

(1)

GAIN

(1)

FSR [µW/cm²] of detectable irradiance Ee (channel A)

2048x

170.000(2)

85.000

1024x

340.000

170.000

512x

680.000

340.000

256x

1360.000

680.000

128x

2720.000

1360.000

64x

5440.000

2720.000

32x

10880.000

5440.000

16x

21760.000

10880.000

43520.000

21760.000

87040.000

43520.000

174080.000

87040.000

348160.000

174080.000

GAIN

(1)

LSB [nW/cm²]

– least significant bit of FSR (channel A)

2048x

166.02

83.01

41.50

20.75

10.38

5.19

2.59

1.30

1024x

332.03

166.02

83.01

41.50

20.75

10.38

5.19

2.59

512x

664.06

332.03

166.02

83.01

41.50

20.75

10.38

5.19

256x

1328.13

664.06

332.03

166.02

83.01

41.50

20.75

10.38

128x

2656.25

1328.13

664.06

332.03

166.02

83.01

41.50

20.75

64x

5312.50

2656.25

1328.13

664.06

332.03

166.02

83.01

41.50

32x

10625.00

5312.50

2656.25

1328.13

664.06

332.03

166.02

83.01

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