Overview
The TPS389012-Q1 is a precision voltage supervisor from Texas Instruments, designed to monitor system voltages and assert a reset signal when the monitored voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. This device is part of the TPS3890-Q1 family, which is qualified for automotive applications and meets AEC-Q100 standards. It features a very low quiescent current of 2.1 μA, making it suitable for battery-powered and space-constrained applications. The TPS389012-Q1 operates over a temperature range of –40°C to +125°C and is available in a small 1.5-mm × 1.5-mm WSON package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Supply Voltage (VDD) | 1.5 | 5.5 | V | |
| Power-On-Reset Voltage (VPOR) | 0.8 | V | ||
| Supply Current (IDD) | 2.09 | μA | ||
| Threshold Accuracy | 1% | |||
| Reset Delay Time | 25 μs | 30 s | ||
| Operating Temperature Range | –40°C | +125°C | °C | |
| Package | 1.5-mm × 1.5-mm WSON |
Key Features
- Qualified for automotive applications with AEC-Q100 qualification.
- Low quiescent current of 2.1 μA.
- High threshold accuracy of 1%.
- Precision hysteresis to ensure well-defined reset assertions and deassertions.
- Fixed and adjustable threshold voltages (from 1.15 V to 5 V).
- Manual reset (MR) input for external reset initiation.
- Open-drain RESET output.
- User-adjustable reset delay time (25 μs to 30 s) using an external capacitor.
Applications
- Infotainment Head Unit
- Hybrid/Digital Cluster
- External Amplifier
- ADAS Camera
- Automotive Gateway
Q & A
- What is the primary function of the TPS389012-Q1?
The primary function of the TPS389012-Q1 is to monitor system voltages and assert a reset signal when the monitored voltage drops below a preset threshold or when the manual reset (MR) pin is driven low.
- What is the quiescent current of the TPS389012-Q1?
The quiescent current of the TPS389012-Q1 is typically 2.1 μA.
- What is the temperature range of the TPS389012-Q1?
The TPS389012-Q1 operates over a temperature range of –40°C to +125°C.
- How is the reset delay time adjusted in the TPS389012-Q1?
The reset delay time can be adjusted between 25 μs and 30 s by connecting an external capacitor to the CT pin.
- What types of threshold voltages are available for the TPS389012-Q1?
The TPS389012-Q1 offers both fixed and adjustable threshold voltages, ranging from 1.15 V to 5 V.
- What is the purpose of the manual reset (MR) input?
The manual reset (MR) input allows a processor or other logic circuits to initiate a reset by driving the MR pin low.
- What is the significance of the SENSE input in the TPS389012-Q1?
The SENSE input is used to monitor the critical voltage rail. If the voltage on this pin drops below the threshold voltage (VITN), the RESET signal is asserted.
- How does the TPS389012-Q1 handle transient voltages on the SENSE pin?
The device has built-in hysteresis and is relatively immune to short transients on the SENSE pin. For noisy applications, a bypass capacitor can be used to reduce sensitivity to transient voltages.
- What package type is the TPS389012-Q1 available in?
The TPS389012-Q1 is available in a 1.5-mm × 1.5-mm WSON package.
- What are some common applications of the TPS389012-Q1?
Common applications include infotainment head units, hybrid/digital clusters, external amplifiers, ADAS cameras, and automotive gateways.
