ICL7665CSA+

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Multi-Voltage Supervisor
Number of Voltages Monitored:	2
Output:	Open Drain or Open Collector
Reset:	Active High
Reset Timeout:	--
Voltage - Threshold:	Adjustable/Selectable
Operating Temperature:	0°C ~ 70°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	ICL7665

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This article introduces the application field and working principle of the ICL7665CSA+, which belongs to the PMIC - Supervisors family.The ICL7665CSA+ is a CMOS digital reset supervisor device with an active-high reset signal. It has been designed too provide an independent two-level reset function to ensure proper operation in multiple-processor systems.The ICL7665CSA+ monitors the positive voltage rails in a system, and resets it to a known state if either one of these voltages falls below a preset level. It is used to guarantee proper system reset throughout microprocessor operations by providing an independent hardware line that initiates a processor reset. It also provides open drain reset outputs (active-high), reset output synchronization, active-high external reset input, power-good output, and adjustable reset active time.

Application Field

The ICL7665CSA+ is used in commercial computing, instrumentation, consumer electronics, medical equipment, automotive and industrial environments.

• Industrial: Automation control systems, process control systems, vending machines, barcode scanning applications, pinball and arcade gaming machines, security systems
• Medical: Medical imaging equipment, MRI scanners, ultrasound imaging systems, drug infusion pumps
• Consumer: Automotive systems (such as smart ignition systems and airbag systems), digital cameras and camcorders, smart amplifiers, GPS navigators and tracking equipment
• Computing: Multiprocessor systems, servers, notebooks, compact PCs, industrial PCs

Working Principle

The ICL7665CSA+ is an active high reset supervisor IC with a low voltage rail monitor. It uses a voltage reference, an error amplifier, a voltage divider, a comparator, and a power up reset.

Voltage Reference

The voltage reference is used to set a reference level for the voltage rail. For example, in a system with a 3.3V rail, the reference level is 3.3V.

Error Amplifier

The error amplifier measures the difference between the actual voltage level of the rail (Vmon) and the reference level set by the voltage reference. If the difference is too high (the rail voltage is too low), it will raise the reset signal.

Voltage Divider

The voltage divider is used to reduce the voltage at the Vmon pin, so that the error amplifier can measure the difference between Vmon and the reference level.

Comparator

The comparator detects if the voltage at Vmon is above or below the reference level. If it is below the reference level, it will raise the reset signal.

Power Up Reset

The power up reset monitors the power rails and asserts a reset signal at power up. It is used to ensure that the system is in a known state when it is first powered up.

Conclusion

The ICL7665CSA+ is a valuable component when used in systems which require an independent two-level reset, such as in multiple-processor systems. Its wide application field and simple, reliable working principles make it a popular choice for industrial and consumer devices alike.

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