L99LD01 datasheet(39/69 Pages) STMICROELECTRONICS

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L99LD01

SPI functional description

Control registers 2

Address:

0x02h

Type:

R/W

Reset:

0101 1110 0001 1111b

876543210

Fdev[2:0]

Fmod[1:0]

Dith_En

Led_Curr[4:0]

Max_Curr[4:0]

Bit [15:13] Fdev[2:0]: frequency deviation of the internal oscillator (see Table 12)

Bit [12:11] Fmod[1:0]: frequency modulation of the internal oscillator (see Table 13)

Bit [10] Dith_En: enable or disable random dither effect.

If this bit is set Dithering is enabled;

If the bit is reset, the dithering is disabled

Bit [9:5] Led_Curr[4:0]: these bits set the LED current.

The LED current is given by:

0.05 + (0.2 * Led_Curr[4:0]d) / 31) / (RSENSE) [A] (typ)

Where Led_Curr[4:0]d = decimal value of Led_Curr[4:0]

Bit [4:0] Max_Curr[4:0]: these bits set the maximum input current.

The internal current limiter voltage threshold is:

1 + (2.5 * Max_Curr[4:0]d) / 31 in [V] (typ)

Considering the gain of the amplifier of 10, the current limitation is:

(1 + 2.5 * Max_Curr[4:0]d / 31) / (10 RSHUNT) (typ);

Where Max _Curr[4:0]d = decimal value of Max_Curr[4:0]

Table 12. Internal oscillator frequency deviation settings

Fdev[2]

Fdev[1]

Fdev[0]

Frequency deviation

0 %

5 %

10 %

15 %

20 %

25 %

30 %

Table 13. Internal oscillator frequency modulation settings

Fmod[1]

Fmod[0]

Frequency modulation

1.95 kHz

3.9 kHz

7.8 kHz

15.6 kHz

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