TA8006ASN 데이터 시트보기 (PDF) - Toshiba
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TA8006ASN Datasheet PDF : 10 Pages
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TA8006ASN
• Watchdog timer function
Program your system to output a clock each time one program routine is finished in the CPU system
software, and input this clock to the CK pin of the IC. The IC‘s TC pin is repeatedly charged and
discharged between 2V and 4V. However, when a clock is input, it switches over and starts
discharging in the middle of charging and then starts charging from 2V again. Since the clock is
generated at predetermined intervals when the CPU system is operating normally, the TC pin
switches over and starts discharging before the charge voltage reaches 4V. However, if no clock is
input while being charged from 2V to 4V, the clock is assumed to have stopped, i.e., the CPU system
has gone wild, so that a reset signal is output to reset the CPU system.
The IC’s CK pin is connected to the CPU system with a differential circuit. This is to ensure that when
an erratic condition occurs in the CPU system, a low signal is always input to the CK pin regardless of
whether the clock output from the CPU has stopped in the high or low state. When the CK pin is fixed
high, no reset signal is output, in which case only the power-on reset timer is useful.
(3) Standby function
When the application system is in a standby (sleep) state, its operating current can be minimized by
keeping only the IC’s constant-voltage 5V output active and turning the entire reset function off. The
low-current mode (standby) is entered by pulling the ST pin low. In this mode, the voltage monitor
functions (1) and (2) and the reset timer all are turned off while RESET , RESET, and WI all are fixed
high.
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2002-02-27
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