Overview
The ADM694ANZ from Analog Devices Inc. is a microprocessor supervisory circuit designed to provide various control and monitoring functions in microprocessor systems. This device is part of the ADM690-ADM695 family and is particularly useful for ensuring reliable operation of microprocessors under various power conditions. It offers features such as power-on reset, battery backup switching, watchdog timer, and power failure warning, making it an essential component in system design.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 4.75 | 5.5 | 5.5 | V | ADM690, ADM691, ADM694, ADM695 |
| VBATT Operating Voltage Range | 2.0 | 4.25 | 4.25 | V | ADM690, ADM691, ADM694, ADM695 |
| Output Voltage (VOUT) | VCC - 0.05 | VCC - 0.025 | VCC - 0.5 | V | IOUT = 1 mA, IOUT ≤ 100 mA |
| Supply Current (Excludes IOUT) | 1 | 1.95 | 1.95 | mA | IOUT = 100 mA |
| Battery Standby Current | -0.1 | +0.02 | +0.02 | µA | TA = +25°C, VCC = 0 V, VBATT = 2.8 V |
| Battery Switchover Threshold | 70 | mV | |||
| Reset Pulse Width | 200 | ms |
Key Features
- Power-on reset output during power-up, power-down, and brownout conditions, with the RESET output operational with VCC as low as 1 V.
- Battery backup switching for CMOS RAM, CMOS microprocessor, or other low power logic.
- A reset pulse if the optional watchdog timer has not been toggled within a specified time.
- A 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5 V.
- Available in 8-pin DIP packages.
Applications
The ADM694ANZ is widely used in various microprocessor systems to ensure reliable operation. Key applications include:
- Microprocessor system power management and supervision.
- Battery backup systems for CMOS RAM and other low-power logic.
- Watchdog timer functions to prevent system hang-ups.
- Power failure detection and warning systems.
- Industrial control systems, embedded systems, and other applications requiring robust power management.
Q & A
- What is the primary function of the ADM694ANZ?
The primary function of the ADM694ANZ is to provide power-on reset, battery backup switching, watchdog timer, and power failure warning in microprocessor systems. - What is the operating voltage range for VCC?
The operating voltage range for VCC is 4.75 V to 5.5 V. - How does the battery switchover work?
The battery switchover circuit compares VCC to VBATT and connects VOUT to whichever is higher, with a switchover threshold of 70 mV. - What is the purpose of the watchdog timer?
The watchdog timer generates a reset pulse if it has not been toggled within a specified time, preventing system hang-ups. - What is the reset pulse width for the ADM694ANZ?
The reset pulse width for the ADM694ANZ is 200 ms. - In what packages is the ADM694ANZ available?
The ADM694ANZ is available in 8-pin DIP packages. - What is the battery standby current?
The battery standby current is typically 0.02 µA at TA = +25°C, VCC = 0 V, and VBATT = 2.8 V. - Can the ADM694ANZ operate with a low VCC voltage?
Yes, the RESET output remains operational with VCC as low as 1 V. - What other functions does the ADM694ANZ provide besides power-on reset?
Besides power-on reset, the ADM694ANZ provides battery backup switching, watchdog timer, and power failure warning. - In which types of systems is the ADM694ANZ commonly used?
The ADM694ANZ is commonly used in microprocessor systems, industrial control systems, and embedded systems.
