lp5522tmx National Semiconductor Corporation, lp5522tmx Datasheet - Page 5

• Manufacturer Part Number: lp5522tmx
• Description: Programmable Led Driver
• Manufacturer: National Semiconductor Corporation

Modes of Operation
RESET
STANDBY:
ACTIVE:
RUN:
Non-programmed mode: No blinking sequence programmed to memory. LED output follows CTRL input
Programmed mode:
RUN ONCE:
TRAINING:
TSD:
In the reset mode all functions are off and all registers are reset to the default values. Reset is entered
always if internal Power On Reset (POR) is active. Power On Reset will activate during the device
startup or when the supply voltage V
After Power On Reset device is in Standby mode. This is the low power consumption mode, when
all circuit functions are disabled.
Once rising edge of CTRL signal is detected device goes into Active mode. In Active mode four sub
modes are present:
Run mode is divided into two sub modes depending on whether a blinking sequence is programmed
into memory or not.
Blinking sequence programmed to memory. LED output follows the programmed blinking sequence
In Run once mode, programmed blinking sequence is performed once and after that device returns
into Standby mode. Run once mode is available only if a blinking sequence is programmed into
memory.
In Training mode new blinking sequence can be programmed. LED output follows CTRL signal
during the programming
If chip temperature rises above 160°C (typ.) device goes into Thermal Shut Down (TSD) mode. In
TSD mode output is disabled but supporting functions are on.
5
IN
falls below 1.5V (typ.).
20217206
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