OPT3004DNPR datasheet(21/47 Pages) TI

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A series of result register output examples with the corresponding LSB weight and resulting lux are given in

Table 8-9. Note that many combinations of exponents (E[3:0]) and fractional results (R[11:0]) can map onto the

same lux result, as shown in the examples of Table 8-9.

Table 8-9. Examples of Decoding the Result Register into lux

RESULT REGISTER

(Bits 15:0, Binary)

EXPONENT

(E[3:0], Hex)

FRACTIONAL RESULT

(R[11:0], Hex)

LSB WEIGHT

(lux, Decimal)

RESULTING LUX

(Decimal)

0000 0000 0000 0001b

00h

001h

0.01

0000 1111 1111 1111b

00h

FFFh

0.01

40.95

0011 0100 0101 0110b

03h

456h

0.08

88.80

0111 1000 1001 1010b

07h

89Ah

1.28

2818.56

1000 1000 0000 0000b

08h

800h

2.56

5242.88

1001 0100 0000 0000b

09h

400h

5.12

5242.88

1010 0010 0000 0000b

0Ah

200h

10.24

5242.88

1011 0001 0000 0000b

0Bh

100h

20.48

5242.88

1011 0000 0000 0001b

0Bh

001h

20.48

1011 1111 1111 1111b

0Bh

FFFh

20.48

83865.60

Note that the exponent field can be disabled (set to zero) by enabling the exponent mask (configuration register,

ME field = 1) and manually programming the full-scale range (configuration register, RN[3:0] < 1100b (0Ch)),

allowing for simpler operation in a manually-programmed, full-scale mode. Calculating lux from the result register

contents only requires multiplying the result register by the LSB weight (in lux) associated with the specific

programmed full-scale range (see Table 8-8). See the Low-Limit Register for details.

See the configuration register conversion time field (CT, bit 11) description for more information on lux resolution

as a function of conversion time.

8.6.2.2 Configuration Register (offset = 01h) [reset = C810h]

This register controls the major operational modes of the device. This register has 11 fields, which are

documented below. If a measurement conversion is in progress when the configuration register is written, the

active measurement conversion immediately aborts. If the new configuration register directs a new conversion,

that conversion is subsequently started.

Figure 8-6. Configuration Register

RN3

RN2

RN1

RN0

OVF

R/W

CRF

POL

FC1

FC0

R/W

LEGEND: R/W = Read/Write; R = Read only

Table 8-10. Configuration Register Field Descriptions

Bit

Field

Type

Reset

Description

15:12

RN[3:0]

R/W

1100b

Range number field (read or write).

The range number field selects the full-scale lux range of the device. The format of this field

is the same as the result register exponent field (E[3:0]); see Table 8-8. When RN[3:0] is set

to 1100b (0Ch), the device operates in automatic full-scale setting mode, as described in the

Automatic Full-Scale Setting Mode section. In this mode, the automatically chosen range is

reported in the result exponent (register 00h, E[3:0]).

The device powers up as 1100 in automatic full-scale setting mode. Codes 1101b, 1110b, and

1111b (0Dh, 0Eh, and 0Fh) are reserved for future use.

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OPT3004

SBOS929A – DECEMBER 2018 – REVISED DECEMBER 2021

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