Overview
The LTC2917IMS-A1#TRPBF, produced by Analog Devices Inc., is a low voltage single-supply monitor with selectable thresholds and an adjustable watchdog timer. This integrated circuit is designed to monitor system voltage and provide a reset signal when the voltage falls below a programmed threshold. It is available in a 10-MSOP package, making it suitable for compact and efficient system designs.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Reset Threshold Accuracy | - | - | - | ±1.5% | - |
| Input Impedance (VM) | VM = 0.5V | - | - | 8 MΩ | - |
| Low Level Input Voltage (VTPIN,LOW) | - | - | 0.5 | - | V |
| High Level Input Voltage (VTPIN,HIGH) | - | - | 1.4 | - | V |
| Reset Timeout Period (tRST(INT)) | VRT = VCC | 150 | 200 | 260 | ms |
| Reset Pull-Up Current (IRT(UP)) | VRT = 0.25V | -2 | -3 | -4 | μA |
| Reset Pull-Down Current (IRT(DOWN)) | VRT = 1.1V | 2 | 3 | 4 | μA |
Key Features
- Selectable thresholds: The LTC2917 allows selection of one of nine internally programmed thresholds using three-state input pins.
- Adjustable watchdog timer: The reset timeout period can be configured using internal timers or external components.
- High-impedance input: When the monitor threshold is configured as ADJ, the internal comparator input is high-impedance, allowing any desired threshold to be chosen using an external resistive divider.
- Anti-glitch circuitry: Prevents spurious changes in output state without sacrificing threshold accuracy.
- Compact package: Available in a 10-MSOP package, suitable for compact system designs.
Applications
The LTC2917IMS-A1#TRPBF is ideal for various applications requiring reliable system voltage monitoring and reset functionality. These include:
- Embedded systems: Ensures the system operates within specified voltage tolerances.
- Industrial control systems: Monitors power supplies to prevent system malfunctions.
- Automotive systems: Provides robust voltage monitoring in automotive environments.
- Medical devices: Ensures reliable operation by monitoring critical power supplies.
Q & A
- What is the primary function of the LTC2917IMS-A1#TRPBF? The primary function is to monitor system voltage and provide a reset signal when the voltage falls below a programmed threshold.
- How are the thresholds selected for the LTC2917? Thresholds are selected using three-state input pins, allowing the choice of one of nine internally programmed thresholds.
- What is the significance of the adjustable watchdog timer? The adjustable watchdog timer allows the reset timeout period to be configured using internal timers or external components, providing flexibility in system design.
- How does the anti-glitch circuitry work? The anti-glitch circuitry prevents spurious changes in output state without sacrificing threshold accuracy.
- What package type is the LTC2917IMS-A1#TRPBF available in? It is available in a 10-MSOP package.
- What is the input impedance of the VM pin? The input impedance of the VM pin is 8 MΩ when VM = 0.5V.
- What is the typical reset timeout period? The typical reset timeout period is 200 ms when VRT = VCC.
- How does the high-impedance input work when the monitor threshold is configured as ADJ? When configured as ADJ, the internal comparator input is high-impedance, allowing any desired threshold to be chosen using an external resistive divider.
- What are some common applications of the LTC2917IMS-A1#TRPBF? Common applications include embedded systems, industrial control systems, automotive systems, and medical devices.
- What is the significance of the tolerance pin in the LTC2917? The tolerance pin selects the tolerance at which the supply connected to the VM pin is monitored, ensuring that the supervisor threshold lies outside the power supply tolerance band to prevent nuisance resets.
