Overview
The ADM8697ARWZ is a microprocessor supervisory circuit produced by Analog Devices Inc. This integrated circuit provides a comprehensive set of functions for power supply monitoring and battery control in microprocessor systems. It is designed to ensure reliable operation of microprocessors by monitoring power supply conditions, managing battery backup, and providing reset and watchdog timer functions.
The ADM8697ARWZ is an upgrade to earlier models such as the ADM696 and MAX697, offering improved performance and additional features. It is fabricated using an advanced epitaxial CMOS process, which combines low power consumption with high reliability and fast operation.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 3.0 | 5.5 | V | ||
| VBATT Operating Voltage Range | 2.0 VCC – 0 | 3 | V | ||
| Reset Delay Time | 70 ms | ||||
| Minimum Operating Temperature | -40 | °C | |||
| Maximum Operating Temperature | 85 | °C | |||
| Standby Current | 400 nA | ||||
| CEIN Threshold | 0.8 | V | VIL = 3.0 V, VIH = 1.2 V | ||
| CEOUT Output Voltage | 0.4 | VCC – 0.5 | V | ISINK = 3.2 mA, ISOURCE = 800 µA | |
| CE Propagation Delay | 2 | 7 ns | VCC = 5.0 V, VCC = 3.0 V |
Key Features
- Power-On Reset Output: Provides reset output during power-up, power-down, and brownout conditions. The reset voltage threshold is adjustable using an external voltage divider.
- Watchdog Timer: Includes a watchdog timer with options for 100 ms, 1.6 s, or adjustable timeout periods. A reset pulse is generated if the watchdog timer is not toggled within the specified time.
- Low Line Voltage Monitor: Features a 1.3 V threshold detector for power fail warning, low battery detection, or monitoring a power supply other than VCC.
- Battery Backup Switching: Although specific to the ADM8696, the ADM8697 series offers related power management features such as write protection of CMOS RAM or EEPROM.
- Fast On-Board Gating of Chip Enable Signals: Provides extremely fast Chip Enable gating (2 ns) to ensure quick response times.
- Low Power Consumption: Operates with low power consumption (0.7 mW) and a standby current of 400 nA).
- High Reliability: Fabricated using an advanced epitaxial CMOS process, ensuring high reliability and minimal voltage drop in power switching circuitry).
Applications
- Microprocessor Systems: Ideal for monitoring and controlling power supply conditions in microprocessor-based systems).
- Computers and Controllers: Used in various computer and controller applications to ensure reliable power management).
- Intelligent Instruments: Suitable for intelligent instruments that require precise power monitoring and control).
- Automotive Systems: Qualified for automotive applications, providing robust power management in vehicle systems).
- Critical µP Power Monitoring: Essential for critical microprocessor power monitoring in various industrial and medical applications).
Q & A
- What is the primary function of the ADM8697ARWZ?
The primary function of the ADM8697ARWZ is to provide power supply monitoring and battery control functions in microprocessor systems, including reset, watchdog timer, and low line voltage monitoring.
- What is the operating voltage range for VCC?
The operating voltage range for VCC is 3.0 V to 5.5 V.
- What is the minimum operating temperature for the ADM8697ARWZ?
The minimum operating temperature is -40°C.
- What is the maximum operating temperature for the ADM8697ARWZ?
The maximum operating temperature is +85°C.
- What is the standby current of the ADM8697ARWZ?
The standby current is 400 nA.
- Does the ADM8697ARWZ have a watchdog timer?
Yes, the ADM8697ARWZ includes a watchdog timer with options for 100 ms, 1.6 s, or adjustable timeout periods.
- What is the propagation delay for the Chip Enable signal?
The propagation delay for the Chip Enable signal is 2 ns to 7 ns, depending on VCC.
- Is the ADM8697ARWZ suitable for automotive applications?
Yes, the ADM8697ARWZ is qualified for automotive applications.
- What package types are available for the ADM8697ARWZ?
The ADM8697ARWZ is available in 16-pin DIP and small outline packages, including TSSOP.
- Can the reset voltage threshold be adjusted?
Yes, the reset voltage threshold can be adjusted using an external voltage divider.
