Overview
The TPS3851G33EDRBR from Texas Instruments is a precision voltage supervisor with an integrated watchdog timer. This device combines high-accuracy undervoltage monitoring with a programmable watchdog function, making it ideal for systems requiring tight voltage tolerance and fault detection. The TPS3851 achieves a 0.8% accuracy for the undervoltage threshold over a temperature range of –40°C to +125°C and includes accurate hysteresis to ensure stable operation. The device is available in a compact 3-mm × 3-mm, 8-pin VSON package, enhancing its suitability for a wide range of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range (VDD) | 1.6 to 6.5 | V |
| Voltage Threshold Accuracy | 0.8% | - |
| Quiescent Current (IDD) | 10 µA (typical) | - |
| Undervoltage Thresholds | 4% and 7% available | - |
| Hysteresis | 0.5% | - |
| Watchdog Timeout | Programmable via external capacitor or factory-programmed | - |
| Package Type | 3-mm × 3-mm, 8-pin VSON | - |
| Junction Operating Temperature Range | –40°C to +125°C | - |
| Reset Delay Accuracy | 15% | - |
Key Features
- Precision undervoltage monitoring with 0.8% accuracy over the specified temperature range.
- Programmable watchdog timer with standard and extended timing options.
- Low quiescent current of 10 µA (typical).
- Open-drain outputs for RESET and watchdog (WDO).
- Manual reset input (MR) with internal pull-up to VDD.
- Watchdog disable feature via the SET1 pin.
- Factory-programmed precision watchdog and reset timers.
- Accurate hysteresis on the undervoltage threshold for noise immunity.
Applications
- WLAN/Wi-Fi access points.
- Wireless security cameras.
- IP network cameras.
- String inverters.
- Blood pressure monitors.
- Electricity meters.
Q & A
- What is the input voltage range of the TPS3851G33EDRBR?
The input voltage range is from 1.6 V to 6.5 V.
- What is the accuracy of the undervoltage threshold?
The undervoltage threshold accuracy is 0.8% over the specified temperature range.
- How is the watchdog timeout programmed?
The watchdog timeout can be programmed using an external capacitor or by selecting factory-programmed default delay settings.
- What is the quiescent current of the TPS3851G33EDRBR?
The quiescent current is 10 µA (typical).
- Can the watchdog timer be disabled?
- What is the package type and size of the TPS3851G33EDRBR?
The device is available in a 3-mm × 3-mm, 8-pin VSON package.
- What are the typical applications of the TPS3851G33EDRBR?
Typical applications include WLAN/Wi-Fi access points, wireless security cameras, IP network cameras, string inverters, blood pressure monitors, and electricity meters.
- How does the manual reset input (MR) function?
A logical low on the MR pin issues a RESET. The RESET remains low for a fixed reset delay time after MR is deasserted (high).
- What is the junction operating temperature range of the TPS3851G33EDRBR?
The junction operating temperature range is –40°C to +125°C.
- Does the TPS3851G33EDRBR have built-in hysteresis for noise immunity?
