1. Function & Overview:

️· The LTC2960 is a low-voltage supervisory circuit. It monitors voltage and generates a reset signal (RST) when the input voltage falls below a programmed threshold.
️· It has multiple versions (LTC2960-1 to LTC2960-4), each with slight variations in functionality.
️· Key Features:
- Low voltage operation (down to 1.2V)
- Adjustable reset threshold via an external resistor divider
- Manual Reset (MR) input
- Reset timeout period selection
- Open-drain outputs (RST and OUT) when DVCC is grounded
- Multiple variations to suit different applications.

2. Input Voltage Monitoring & Reset Threshold:

️· The RST output pulls low when the input voltage (VCC) falls below the preset threshold (ADJ input).
️· The reset threshold is adjustable using an external resistor divider connected to the ADJ input.
️· The circuit has hysteresis (2.5%) to prevent oscillation during voltage fluctuations.
️· When VCC recovers, RST remains low for a defined timeout period before returning high.

3. Outputs (RST & OUT):

️· RST (Reset): The main output signal. Goes low when the monitored voltage falls below the threshold, and returns high after a timeout.
️· OUT: A secondary output that typically mirrors the RST signal, or monitors a different voltage depending on the version. It is also open drain.
️· The version of the LTC2960 you are using determines the behavior of OUT when DVCC is high. Some versions are driven to a logic high level (controlled by DVCC) while others are open drain.

4. Key Inputs & Functions:

️· ADJ: Adjusts the reset threshold (tie to resistor divider).
️· MR: Manual reset input (tie to push button or logic signal).
️· RT: Selects the reset timeout period (tie to ground for short delay, VCC for longer delay).
️· DVCC: Logic supply for outputs (RST/OUT) - grounding it makes the outputs open drain.
️· IN[+] / IN[-] These inputs allow for additional voltage monitoring and different output behavior depending on the specific part number.

5. Pin Functions (Quick Reference):

️· ADJ: Reset threshold adjustment.
️· DVCC: Logic supply for RST and OUT outputs.
️· GND: Ground.
️· IN[+] / IN[-]: Threshold adjustment inputs.
️· MR: Manual reset input.
️· OUT: Output signal.
️· RST: Reset output.
️· RT: Reset timeout selection.
️· VCC: Main power supply input.

6. Important Considerations:

️· Bypass Capacitors: Use 0.1uF bypass capacitors on both VCC and DVCC lines to GND.
️· Open Drain Outputs: If DVCC is grounded, RST and OUT are open-drain and require a pull-up resistor to be useful.
️· Part Number Variations: Pay close attention to the specific LTC2960 part number you are using, as it dictates the behavior of the outputs and other functions.