Datasheet

DS_INLC10AQ Revision 1.0_B

Inova Semiconductors Confidential

Page 26 of 35

Ambient Temperature TA

Accuracy Tj, det

Unit

-40

±17.7

°C

25

±8.8

°C

105

±4.8

°C

Table 25 - Temperature detection accuracy

4.5

Red LED Temperature Compensation Feature

The luminous intensity of typical red LEDs shows a significant temperature-dependency that is almost linear.

The INLC10AQ provides a feature to compensate this effect. For that purpose, the on-chip sensor and ADC

system detect the chip temperature ADCTemp that points to a lookup table (s. Figure 19). The interpolated

lookup table output TC is a compensation factor which is considered in the PWM scaling process (s. Table

26). The lookup table and accordingly the factor TC can be linear or non-linear over temperature. The linear

lookup table can be stored in the on-chip memory and is directly available after every hardware reset. A

non-linear lookup table requires several downstream commands right after the initialization.

The compensation feature can be en-/disabled during the device initialization.

Figure 19 - Temperature compensation block diagram

Temperate Compensation

Scaling

Disabled

PWM = (PWMmax x RGB + 128) >> 8

Enabled

PWM = ((PWMmax x RGB + 128) >>8) x TC + 256) >> 9

Table 26

– Scaling of red LED channel