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TSL2550 Datasheet(PDF) 10 Page - ams AG |
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TSL2550 Datasheet(HTML) 10 Page - ams AG |
10 / 21 page TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE TAOS029L − OCTOBER 2007 9 The LUMENOLOGY r Company r r Copyright E 2007, TAOS Inc. www.taosinc.com The specific ADC value register read depends on the last read command written to the command register, as described above and in the Operation section, below. The MSB of the ADC register (VALID bit B7) is used to indicate that data has been written to the ADC register after the device is powered up as described in Command Register section. Bits 6 through 0 contain the 7-bit code representing the ADC count value, which is proportional to a photodetector current. In this code, the ADC count value is represented by a piece-wise linear approximation to a log function. The transfer function is broken into 8 chords of 16 steps each. (This code is very similar to μ-law code used in audio compression — it differs in that it does not have a sign bit and it is not inverted.) Table 3 shows the relationship between the CHORD and STEP bits and the CHORD and STEP numbers and values. These are used to calculate the ADC count value. Table 3. CHORD and STEP Numbers and Values vs Register Bits CHORD BITS B6, B5, B4 C, CHORD NUMBER CHORD VALUE (Note A) STEP VALUE (Note B) STEP BITS B3, B2, B1, B0 S, STEP NUMBER 000 0 0 1 0000 0 001 1 16 2 0001 1 010 2 49 4 0010 2 011 3 115 8 0011 3 100 4 247 16 0100 4 101 5 511 32 0101 5 110 6 1039 64 0110 6 111 7 2095 128 0111 7 1000 8 1001 9 1010 10 1011 11 1100 12 1101 13 1110 14 1111 15 NOTES: A. CHORD VALUE = INT (16.5 × ((2C) − 1)) B. STEP VALUE = 2C The ADC count value is obtained by adding the CHORD VALUE and the product of the STEP NUMBER and STEP VALUE (which depends on CHORD NUMBER). ADC Count Value + ((Chord Value) ) (Step Value) (Step Number)) The ADC count value can also be expressed as a formula: ADC Count Value + (INT (16.5 ((2C * 1))) ) (S (2C)) where: C is the CHORD NUMBER (0 to 7) S is the STEP NUMBER (0 to 15) as defined in Table 3. |
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