ADM800 Analog Devices, ADM800 Datasheet

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... CE IN RESET & OSC IN RESET & WATCHDOG GENERATOR OSC SEL TIMEBASE WATCHDOG WATCHDOG TRANSITION DETECTOR INPUT (WDI) POWER FAIL INPUT (PFI) 1.25V ADM691A/ADM693A ADM800L/ADM800M 1 VOLTAGE DETECTOR = 4.4V (ADM693A/ADM800M) INPUT POWER +5V 7805 BATT BATTERY R1 ADM691A ADM693A ADM800L PFI ADM800M GND R2 OSC IN NC ...

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... ADM691A/ADM693A/ADM800L/M–SPECIFICATIONS ( 5.5 V (ADM691A, ADM800L) 4 5.5 V (ADM693A, ADM800M Parameter BATTERY BACKUP SWITCHING Operating Voltage Range CC BATT V Output Voltage OUT Output Resistance CC OUT V in Battery Backup Mode OUT Output Resistance BATT OUT Supply Current (Excludes I ) OUT Supply Current in B. Backup (Excludes I Battery Standby Current (+ = Discharge, – ...

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... OUT 3.65 2.00 100 Model + 0.5 V OUT ADM691AAN ADM691AARN ADM691AARW ADM691AARU ADM693AAN ADM693AARN ADM693AARW ADM800LAN ADM800LARN ADM800LARW ADM800MAN ADM800MARN ADM800MARW Table I. Product Selection Table Watchdog Battery Backup CC Timeout Switching 3% 100 ms, 1.6 s, Adj. Yes 3% 100 ms, 1.6 s, Adj. Yes 2% 100 ms, 1.6 s, Adj. Yes 2% 100 ms, 1.6 s, Adj. ...

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... RESET OUT WDO ADM691A CC ADM693A GND ADM800L CE BATT ADM800M LOW LINE 6 11 WDI TOP VIEW (Not to Scale) 7 PFO OSC PFI OSC SEL –4– depending on which is at the highest poten- OUT is switched switched to V ...

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... TEMPERATURE – C Figure 3. I vs. Temperature: Battery Backup Mode BATT –50 – TEMPERATURE – C Figure 4. Chip Enable ON-Resistance vs. Temperature REV. 0 ADM691A/ADM693A/ADM800L/M 1.2 1.1 1.0 0.9 0.8 0.7 0.6 –50 75 100 125 Figure Figure 6. V ...

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... ADM691A/ADM693A/ADM800L 0.5 1.0 1.5 2.0 2.5 3.0 V – Figure 8. Battery Current vs. Input Supply Voltage 100 LONG WATCHDOG TIMEOUT PERIOD 10 RESET ACTIVE TIMEOUT PERIOD = > 1 SHORT WATCHDOG TIMEOUT PERIOD 0.1 10 100 C – pF OSC Figure 9. Watchdog and Reset Timeout Period vs. OSC IN Capacitor 7.0 6.5 6.0 5.5 5.0 4.5 4.0 –50 – ...

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... OSC IN pin. Refer to Table II. The guaranteed minimum and maximum thresholds of the ADM691A/ADM800L are 4.5 V and 4.75 V, while the guaran- teed thresholds of the ADM693A/ADM800M are 4.25 V and 4.5 V. The ADM691A/ADM800L is therefore compatible with 5 V supplies with a +10%, –5% tolerance while the ADM693A/ ADM800M is compatible with 5 V 10% supplies ...

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... ADM800_ 7 CLOCK OSC 250kHz Figure 18a. External Clock Source 8 NC OSC SEL ADM69_A ADM800_ 7 OSC OSC SEL ADM69_A ADM800_ 7 OSC IN C OSC Figure 18c. External Capacitor Reset Active Period 2048 clks C/47 pF 1200 ms C/47 pF 200 ms 200 ms OSC SEL t RS REV. 0 ...

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... V power supply falls below the reset threshold. PFO is normally used to interrupt the microprocessor so that data can be stored in RAM and the shut- down proce- dure executed before power is lost. REV. 0 ADM691A/ADM693A/ADM800L/M POWER Table III. Input and Output Status in Battery Backup Mode Signal V ...

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... ADM69_A BATT RECHARGEABLE ADM800_ BATTERY Figure 22. Rechargeable Battery Adding Hysteresis to the Power Fail Comparator For increased noise immunity, hysteresis may be added to the power fail comparator. Since the comparator circuit is noninverting, hysteresis can be added simply by connecting a resistor between the PFO output and the PFI input as shown in Figure 23. When PFO is low, resistor R3 sinks current from the summing junction at the PFI pin ...

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... V V BATT CC OUT ON CMOS OUT BATT RAM ADM691A ADDRESS ADM693A CE IN DECODE ADM800L PFI ADM800M GND WDI OSC IN PFO OSC SEL RESET LOW LINE WDO 0.1µF RESET SYSTEM STATUS INDICATORS Figure 24. Typical Application Circuit A0–A15 I/O LINE µ P NMI RESET ...

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... ADM691A/ADM693A/ADM800L/M 16-Lead Plastic DIP (N-16) 0.840 (21.33) 0.745 (18.93 0.280 (7.11) 0.240 (6.10 PIN 1 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) 0.100 0.070 (1.77) SEATING 0.022 (0.558) PLANE (2.54) 0.045 (1.15) 0.014 (0.356) BSC 16-Lead Wide SOIC (R-16W) 0.4133 (10.50) 0.3977 (10.00 0.1043 (2.65) PIN 1 0.0118 (0.30) 0.0926 (2.35) ...