Overview
The ADM690ANZ, part of the ADM690-ADM695 family, is a microprocessor supervisory circuit designed by Analog Devices Inc. This component provides comprehensive single-chip solutions for power supply monitoring and battery control functions in microprocessor systems. It is particularly useful for ensuring reliable operation during power-up, power-down, and brownout conditions.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Operating Voltage Range (VCC) | 4.75 V to 5.5 V | |
| Battery Voltage Range (VBATT) | 2.0 V to 4.25 V | |
| Reset Assertion Voltage | 4.65 V | |
| Watchdog Timeout Period | 1.6 s (fixed), adjustable in some models | |
| Power-on Reset Time | 50 ms (ADM690), 200 ms (ADM694) | |
| Supply Current (excluding IOUT) | 1 to 1.95 mA | |
| Battery Standby Current | 0.6 to 1 µA | VCC = 0 V, VBATT = 2.8 V |
| Output Voltage (VOUT) in Battery Backup Mode | VBATT - 0.05 V to VBATT - 0.02 V | IOUT = 250 µA, VCC < VBATT - 0.2 V |
Key Features
- Precision Voltage Monitoring: The ADM690ANZ features a precise voltage monitor that can assert a reset down to 1 V VCC.
- Low Power Consumption: It operates with low power consumption of 5 mW.
- Battery Backup Switching: Automatic battery backup switching for CMOS RAM or other low-power logic.
- Watchdog Timer: Includes a watchdog timer with fixed or adjustable timeout periods (100 ms, 1.6 s, or adjustable).
- High Current Drive: Capable of driving high currents up to 100 mA.
- Fast Gating of Chip Enable Signals: Extremely fast gating of chip enable signals (5 ns).
- Power Fail Warning: Provides a 1.3 V threshold detector for power fail warning or low battery detection.
Applications
- Microprocessor Systems: Ideal for monitoring and controlling power supplies 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: Applied in automotive systems for robust power supply management.
Q & A
- What is the primary function of the ADM690ANZ?
The primary function of the ADM690ANZ is to provide power supply monitoring and battery control functions in microprocessor systems.
- What is the operating voltage range for the ADM690ANZ?
The operating voltage range for the ADM690ANZ is 4.75 V to 5.5 V.
- Does the ADM690ANZ support battery backup switching?
- What are the available watchdog timeout periods for the ADM690ANZ?
The watchdog timeout periods available are 100 ms, 1.6 s, or adjustable in some models.
- How much current can the ADM690ANZ drive?
The ADM690ANZ can drive up to 100 mA of current.
- What is the purpose of the power fail warning feature?
The power fail warning feature, using a 1.3 V threshold detector, is used to detect power fail conditions or low battery levels.
- What is the typical supply current of the ADM690ANZ?
The typical supply current of the ADM690ANZ is between 1 to 1.95 mA.
- How does the battery switchover work in the ADM690ANZ?
The battery switchover circuit connects VOUT to whichever is higher between VCC and VBATT, with a hysteresis of 20 mV to prevent rapid switching.
- What are some common applications of the ADM690ANZ?
Common applications include microprocessor systems, computers, controllers, intelligent instruments, and automotive systems.
- What is the standby current when the device is in battery backup mode?
The standby current in battery backup mode is between 0.6 to 1 µA.
