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S-35710B01A-K8T2U Datasheet(PDF) 14 Page - Seiko Instruments Inc |
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S-35710B01A-K8T2U Datasheet(HTML) 14 Page - Seiko Instruments Inc |
14 / 33 page FOR AUTOMOTIVE 125°C OPERATION 2-WIRE CONVENIENCE TIMER S-35710 Series Rev.1.5_00 14 2. Handshake time-out Handshake time-out is a type to output "L" level interrupt signal from the INT pin. After the RST _______ pin changes from "L" to "H", the timer starts the operation. Then, the INT pin outputs "L" level when the timer value matches the value written to the wake-up time register. When the INT pin outputs "L" level, the timer stops and maintains the timer value. The timer is reset by inputting "L" to the RST _______ pin. After that, if "H" is input to the RST _______ pin, the INT pin is set to "H" and the timer restarts the count-up action. Remark The above description is the example of Nch open-drain output product. In CMOS output product, the INT pin output is the inverse logic of Nch open-drain output product. 2. 1 Write mode If write operation is performed to the wake-up time register during the count-up action, the action will be restarted after resetting the timer. This operation is called "write mode". Before the timer value matches the value written to the wake-up time register, if "L" is input to the RST _______ pin, the timer is reset. RST INT 2 s 1 s "0 h" "0 h" "1 h" "2 h" "1 h""2 h" "0 h" "1 h""0 h" "000000 h" "000001 h" "000002 h" "000000 h" Timer Wake-up time register Timer is reset and count-up action restarts Count-up action stops Count-up action stops Timer is reset and the count-up action restarts Timer and wake-up time register are reset Timer and wake-up time register are reset Count-up action starts Count-up action starts Figure 18 Output Timing of Handshake Time-out (Nch Open-drain Output) RST INT 2 s 1 s "0 h" "0 h" "1 h" "2 h" "1 h""2 h" "0 h" "1 h""0 h" "000000 h" "000001 h" "000002 h" "000000 h" Timer Wake-up time register Timer and wake-up time register are reset Timer and wake-up time register are reset Count-up action starts Count-up action starts Timer is reset and count-up action restarts Timer is reset and the count-up action restarts Count-up action stops Count-up action stops Figure 19 Output Timing of Handshake Time-out (CMOS Output) |
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