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LTC690 Datasheet(PDF) 13 Page - Linear Technology |
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LTC690 Datasheet(HTML) 13 Page - Linear Technology |
13 / 16 page 13 LTC690/LTC691 LTC694/LTC695 Figure 12. Oscillator Configurations S APPLICATI I FOR ATIO The LTC691 and LTC695 provide an additional output (Watchdog Output, WDO) which goes low if the watchdog timer is allowed to time out and remains low until set high by the next transition on the WDI pin. WDO is also set high when VCC falls below the reset voltage threshold or VBATT. The LTC691 and LTC695 have two additonal pins OSC SEL and OSC IN, which allow reset active time and watchdog time-out period to be adjusted per Table 2. Several con- figurations are shown in Figure 12. OSC IN can be driven by an external clock signal or an external capacitor can be connected between OSC IN and GND when OSC SEL is forced low. In these configurations, the nominal reset active time and watchdog time-out period are determined by the number of clocks or set by the formula in Table 2. When OSC SEL is high or floating, the internal oscillator is enabled and the reset active time is fixed at 35ms minimum for the LTC691 and 140ms minimum for the LTC695. OSC IN selectes between the 1 second and 70ms minimum normal watchdog time-out periods. In both cases, the time-out period immediately after a reset is at least 1 second. Figure 11. Watchdog Time-Out Period and Reset Active Time t1 = RESET ACTIVE TIME t2 = NORMAL WATCHDOG TIME-OUT PERIOD t3 = WATCHDOG TIME-OUT PERIOD IMMEDIATELY AFTER A RESET VCC = 5V t2 t3 t1 t1 WDO WDI RESET 690 F11 EXTERNAL CLOCK INTERNAL OSCILLATOR 1.6 SECOND WATCHDOG INTERNAL OSCILLATOR 100ms WATCHDOG EXTERNAL OSCILLATOR GND GND GND GND VCC VCC VCC OSC SEL OSC SEL OSC SEL OSC SEL OSC IN OSC IN OSC IN OSC IN 3 3 3 3 4 4 4 4 8 8 8 8 7 7 7 7 VCC FLOATING OR HIGH FLOATING OR HIGH LTC691 LTC695 FLOATING OR HIGH LTC691 LTC695 LTC691 LTC695 LTC691 LTC695 690 F12 5V 5V 5V 5V |
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