The LP5814I provides instant blinking function for applications that require LED indication before controller is ready to send command. When VCC voltage is higher than V_{CC_UVLO} and instant blinking function is not disabled (INSTABLINK_DIS = 0), the OUT0 waits 300ms blank time to start blinking. The timing is shown in Figure 7-9.

During the 300ms blank time,

• if the instant blinking function is not disabled (INSTABLINK_DIS = 0 (default)), the LP5814I doesn't respond to the 5 dedicated software commands as described in Command Description and the OUT0 of the LP5814I starts running the blinking pattern as showed in Instant Blinking Pattern after the blank time.
• if the instant blinking function is disabled by setting the INSTABLINK_DIS as 1 through the I²C interface, the LP5814I responds to the 5 dedicated software commands as described in Command Description. The OUT0 doesn't run the blinking pattern after the blank time.

While the LP5814I staying in INSTANT BLINKING mode,

• the OUT0 keeps running the blinking pattern and instant blinking function is not disabled (INSTABLINK_DIS = 0).
• the 5 dedicated software commands don't work as described in Command Description.
• the OUT0 stops running the blinking pattern if instant blinking function is disabled (INSTABLINK_DIS = 1).

Figure 7-9 Instant Blinking Timing

Figure 7-10 shows the parameters of 1 cycle blinking pattern.

At the beginning, there is 500ms pause time before PWM starts ramping up. After the pause time, the PWM ramps up from 0 to 50% in 200ms, then keeps 50% for 1s. Next, it starts ramping down from 50% to 0 in 200ms. At last, the PWM keeps off for another 500ms pause time before the next cycle starts.

The maximum current setting for the instant blinking is 25.5mA with OUT0_DC = 0xFF, MAX_CURRENT = 0.

Figure 7-10 Instant Blinking Pattern

Figure 7-11 shows a typical application circuit that provides the instant blinking function. And there is a LED connected to OUT0.

Figure 7-11 Instant Blinking Application Circuit