S-35770E01A-K8T2U Datasheet, PDF (12/26 Pages) Seiko Instruments Inc – CONVENIENCE TIMER

FOR AUTOMOTIVE 125°C OPERATION 2-WIRE COUNTER CONVENIENCE TIMER
S-35770 Series
Rev.1.2_00
 LOOP Pin
The S-35770 Series detects the change of the CLKIN pin from "L" to "H", and then starts the count-up action of the
counter. The counter loops back to 0 after rea_{__}c_{_}h_{__}i_{_}n_{_}g 16,777,215. At this time, the LOOP pin changes from "H" to "L". To
change the LOOP pin to "H", input "L" to the RST pin or input the reset command to the free register.
Furthermore, if the counter loops back to 0 again after reaching 16,777,215 under the condition the LOOP pin maintains
"L", the LOOP pin changes from "L" to "H". In other word, each time the counter loops back to 0 after reaching
16,777,215, the LOOP pin performs a toggle operation.
Remark The above description is the example of Nch open-drain output product.
In CMOS output product, the LOOP pin output is the inverse logic of Nch open-drain output product.
RST
CLKIN
Counter ^{0 1 2 3}
0 1 2 ^{16,777,214 16,777,215}
16,777,215 _{0 1 2}
16,777,215 _{0 1 2 0}
LOOP
Counter reset
LOOP pin "H""L"
Counter reset
LOOP pin
"L""H"
Figure 15 LOOP Pin Operation (Nch Open-drain Output)
Counter reset
by RST pin = "L" input or reset command input.
LOOP pin
"L""H"
RST
CLKIN
Counter ^{0 1 2 3}
LOOP
0 1 2 ^{16,777,214 16,777,215}
16,777,215 _{0 1 2}
Counter reset
LOOP pin "L""H"
Counter reset
LOOP pin "H""L"
Figure 16 LOOP Pin Operation (CMOS Output)
16,777,215 _{0 1 2 0}
Counter reset
by RST pin = "L" input or reset command input.
LOOP pin
"H""L"
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