JAJSD10B March 2017 – July 2018 LP8863-Q1
PRODUCTION DATA.
The LP8863-Q1 device supports a cluster mode where the duty cycles and LED current of the six LED current drivers can be controlled independently. This mode can also select which LED current driver’s headroom levels are used by the adaptive boost voltage control loop. If the anode of an LED string is supplied by an external supply and not the integrated boost controller then its LED_EXT_SUPPLY bit is set to 1. The cluster mode configuration registers are summarized in Table 11. More details can be found in Register Maps.
REGISTER NAME | FUNCTION |
LED0_GROUP...LED5_GROUP | Selects which of the five CLUSTERx_BRT or DISPLAY_BRT registers control each LED current driver. |
CLUSTER1_BRT…CLUSTER5_BRT | Five 16-bit brightness values that can be used in addition to the DISPLAY_BRT register. |
LED0_CURRENT…LED5_CURRENT | Six 12-bit current registers allow LED current to be independently scaled from maximum level for LED current driver. |
LOAD_BRT_DB | Load BRT bit is written to 1 in order to update the CLUSTERx_BRT and LEDx_CURRENT registers at the same time. |
LED_EXT_SUPPLY | Six bits to select which LED current driver is powered from an external supply and not the boost converter. |
LED0_SHORT_DISABLE… LED5_SHORT_DISABLE | Six bits to individually disable LED short detection for each LED current driver. Used if LED current value is set to lower value than other strings. |