stled325 STMicroelectronics, stled325 Datasheet - Page 16

• Manufacturer Part Number: stled325
• Description: I?c Interfaced, Advanced Led Controller/driver With Keyscan, Standby Power Management And Real Time Clock Rtc
• Manufacturer: STMicroelectronics

Functional description
Note:
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2
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Figure 5.
Guard timer is turned off by default upon READY assertion.
If Guard timer is to be kept on during READY high condition, the guard timer registers must
be set accordingly by proper commands through I
In this power-up condition, Guard timer is triggered by internal POR pulse.
During power-up, the Guard timer value is 10s.
VCC to STLED325I
Internal POR
VCC to STLED325I
READY
Power-up condition
MUTE
STBY
Internal POR
1a) Power-up condition (normal behavior )
1b) Power-up condition (processor not responding )
READY
MUTE
STBY
Guard timer counts up to 10s
READY asserts within 10s which is the desired
Doc ID 17576 Rev 1
behavior, processor is active and not hung
Due to abnormality in the processor, READY did not
change state from low to high, leading to STBY
Guard timer counts up to 10s
2
C bus.
READY continues to remain low/high
assertion
Count over
STLED325