Overview
The TPS3850H01DRCR from Texas Instruments is a precision voltage supervisor integrated with a programmable window watchdog timer. This device is designed to provide high-accuracy voltage supervision and watchdog functionality, making it ideal for systems requiring tight voltage tolerance. The TPS3850 combines overvoltage and undervoltage detection with a precision voltage reference, ensuring reliable operation across a wide range of applications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage Range (VDD) | 1.6 | 6.5 | V | |
| Supply Current (IDD) | 10 | 19 | µA | |
| Overvoltage Threshold Accuracy (VIT+(OV)) | VIT+(nom) - 0.8% | VIT+(nom) | VIT+(nom) + 0.8% | % |
| Undervoltage Threshold Accuracy (VIT-(UV)) | VIT-(nom) - 0.8% | VIT-(nom) | VIT-(nom) + 0.8% | % |
| Hysteresis Voltage | 0.2% | 0.5% | 0.8% | % |
| Junction Operating Temperature Range | -40 | 125 | °C | |
| Reset Timeout Period (CRST = NC) | 170 | 200 | 230 | ms |
| Watchdog Timeout (CWD = NC) | 62.74 ms | 77.45 s |
Key Features
- Precision voltage supervisor with 0.8% voltage threshold accuracy over the temperature range of -40°C to +125°C.
- User-programmable watchdog timeout and reset delay using external capacitors.
- Factory-programmed precision watchdog and reset timers.
- Open-drain outputs for RESET and watchdog (WDO).
- Precision over- and undervoltage monitoring with ±4% and ±7% fault windows available.
- Low supply current: IDD = 10 µA (typical).
- Watchdog disable feature via logic pins.
- Available in a small 3-mm × 3-mm, 10-Pin VSON package.
- Accurate hysteresis on both overvoltage and undervoltage thresholds.
Applications
- Ultrasound scanners
- Storage area networks
- Active Antenna Systems (AAS) for mMIMO
- Robot servo drives
- Infusion pumps
- HVAC controllers
Q & A
- What is the input voltage range for the TPS3850?
The input voltage range for the TPS3850 is from 1.6 V to 6.5 V.
- What is the accuracy of the voltage thresholds for the TPS3850?
The voltage thresholds for the TPS3850 have an accuracy of 0.8% over the temperature range of -40°C to +125°C.
- How can the watchdog timeout be programmed?
The watchdog timeout can be programmed by connecting a capacitor between the CWD pin and ground. The timeout period can also be set using factory-programmed default delay settings or by connecting a 10-kΩ resistor to VDD or leaving the pin unconnected.
- What is the typical supply current of the TPS3850?
The typical supply current of the TPS3850 is 10 µA.
- What are the available fault windows for over- and undervoltage monitoring?
The TPS3850 supports fault windows of ±4% and ±7% for over- and undervoltage monitoring.
- Can the watchdog be disabled?
- What is the package type and size of the TPS3850?
The TPS3850 is available in a 3-mm × 3-mm, 10-Pin VSON package.
- What is the junction operating temperature range of the TPS3850?
The junction operating temperature range of the TPS3850 is from -40°C to +125°C.
- How is the reset timeout period programmed?
The reset timeout period can be programmed by connecting a capacitor between the CRST pin and ground. It can also be set using factory-programmed default delay settings or by connecting a 10-kΩ resistor to VDD or leaving the pin unconnected.
- What are some typical applications of the TPS3850?
Typical applications include ultrasound scanners, storage area networks, active antenna systems, robot servo drives, infusion pumps, and HVAC controllers.
