sccw77400a ON Semiconductor, sccw77400a Datasheet - Page 7

• Manufacturer Part Number: sccw77400a
• Description: Reflective Optical Switch.
• Manufacturer: ON Semiconductor

Functional Descriptions
The operation of the ASIC is controlled by a sequencer
witch is clocked by an internal oscillator. The switch
operates in a pulsed mode to realize low current
consumption. Most of the time the ASIC is in sleeps mode
Oscillator and Sequencer
ON Semiconductor Confidential Proprietary
DETAIL OPERATING DESCRIPTION
Figure 9: Functional Block Diagram
http://onsemi.com
SCCW77400
7
T
with enabling the transimpedance amplifier. After a settling
time T
photo current caused by ambient light and transistor
leakage current. After expiration of the separation time T
the LED is switched on (T
trigger begins to compare the difference between the new
photo-current and the stored one with taking into account
SLEEP
. After the start-up sequence, the active phase starts
SETTLING
the CDS Schmitt trigger stores the received
PLUSE
) and the CDS Schmitt
SEP