FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER

S-35720 Series

Seiko Instruments Inc.

13



Chattering Elimination of RST

_________

Pin

The RST

_______

pin is active "L". Because the RST

_______

pin has an internal chattering elimination circuit, "L" time period of 0.25

seconds or more is needed to confirm the "L" input.

Figure 15 is a timing chart of chattering elimination. Perform sampling at 8 Hz and operate the shift register circuit.

Perform shift operation for 3 times, and reset the counter when DF1 to DF3 are all "L".

Clock (8 Hz)

Chattering elimination width (0.25 seconds)

RST pin input signal

Shift register_DF1

Shift register_DF2

Shift register_DF3

Reset signal after

chattering elimination

Figure 15 Timing Chart of Chattering Elimination