RE46C191 datasheet(13/44 Pages) MICROCHIP

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DS20005225H-page 13

RE46C191

4.0

USER PROGRAMMING MODES

User Programming modes provide the means to

configure the RE46C191 for a particular application.

Parametric programming allows the photo amp gain

and integration time to be adjusted for the particular

application, along with the IRED current. Table 4-1 lists

the parametric characteristics that can be selected for

the application.

TABLE 4-1:

PARAMETRIC PROGRAMMING(1,2,3)

Parametric Programming

Range

Resolution

IRED Period

100-400 µs

100 µs

IRED Current Sink

50-200 mA

50 mA

Low Battery Detection Voltage

2.1-2.8V

100 mV

Photo Detection Limits

Typical Maximum Input Current (nA)

100 µs

200 µs

300 µs

400 µs

Normal/Hysteresis

GF = 1

19.4

14.5

GF = 2

14.5

9.6

7.2

GF = 3

14.5

7.2

4.8

3.6

GF = 4

7.2

3.6

2.4

1.8

Hush

GF = 1

116

38.8

GF = 2

19.4

14.5

GF = 3

14.5

9.6

7.2

GF = 4

14.5

7.2

4.8

3.6

Chamber Test

GF = 1

14.5

9.6

7.2

GF = 2

14.5

7.2

4.8

3.6

GF = 3

7.2

3.6

2.4

1.8

GF = 4

3.6

1.8

1.2

0.9

Note 1: GF is the user-selectable photo integration Gain Factor. Once selected, it applies to all modes of

operation. For example, if GF = 1 and integration time is selected to be 100 µs, the ranges are as follows:

Normal/Hysteresis = 58 nA, Hush = 116 nA and Chamber Test = 29 nA.

2: Nominal measurement resolution in each case is 1/63 of the maximum input range.

3: The same current resolution and ranges apply to the limits.

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