Overview
The TPS3851G18EQDRBRQ1 is a high-accuracy voltage supervisor with an integrated watchdog timer, designed and manufactured by Texas Instruments. This device combines a precision voltage supervisor with a programmable watchdog timer, making it ideal for applications requiring tight voltage tolerance and robust fault detection. The TPS3851G18EQDRBRQ1 is AEC-Q100 qualified, ensuring it meets stringent automotive standards with an operating temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | –0.3 to 7 | V |
| Undervoltage Threshold Accuracy | 0.8% | |
| Operating Temperature Range | –40 to 125 | °C |
| Watchdog Timeout Options | External capacitor, 10-kΩ pullup resistor to VDD, or unconnected | |
| Package Type | 8-pin VSON | |
| Package Size | 3.00 mm × 3.00 mm | |
| Junction-to-Ambient Thermal Resistance | 47.7 | °C/W |
Key Features
- Precision Undervoltage Supervisor: Achieves 0.8% accuracy over the specified temperature range of –40°C to +125°C.
- Programmable Watchdog Timer: Can be set using an external capacitor, a 10-kΩ pullup resistor to VDD, or left unconnected for default settings.
- Independent Watchdog Output (WDO): Provides flexibility to flag a fault in the watchdog timing without performing an entire system reset.
- Manual Reset (MR) Input: Allows a processor or other logic circuits to initiate a reset.
- SET1 Pin for Watchdog Control: Enables or disables the watchdog timer dynamically.
- Small Package Size: Available in a 3.00-mm × 3.00-mm, 8-pin VSON package with wettable flanks for easy optical inspection.
Applications
The TPS3851G18EQDRQ1 is suitable for a variety of applications, including automotive systems, industrial control systems, and any environment where high-accuracy voltage supervision and watchdog functionality are critical. It is particularly useful in systems requiring tight tolerance voltage monitoring and robust fault detection mechanisms.
Q & A
- What is the operating temperature range of the TPS3851G18EQDRBRQ1? The operating temperature range is –40°C to 125°C.
- What is the accuracy of the undervoltage threshold? The undervoltage threshold accuracy is 0.8% over the specified temperature range.
- How can the watchdog timeout be programmed? The watchdog timeout can be programmed using an external capacitor, a 10-kΩ pullup resistor to VDD, or left unconnected for default settings.
- What is the purpose of the SET1 pin? The SET1 pin enables or disables the watchdog timer dynamically.
- What is the package type and size of the TPS3851G18EQDRBRQ1? The device is available in an 8-pin VSON package with a size of 3.00 mm × 3.00 mm.
- Is the TPS3851G18EQDRBRQ1 AEC-Q100 qualified? Yes, it is AEC-Q100 qualified, making it suitable for automotive applications.
- How does the manual reset (MR) input work? A logical low on the MR pin initiates a reset, and after MR returns to a logic high and VDD is above the undervoltage threshold, the RESET is deasserted after the reset delay time.
- What is the function of the WDO (Watchdog Output) pin? The WDO pin provides an independent output to flag a fault in the watchdog timing without performing an entire system reset.
- How does the RESET pin operate? The RESET pin remains high when VDD is greater than the negative threshold voltage and goes low when VDD falls below the threshold, holding low for a specified reset delay period.
- What are the thermal characteristics of the TPS3851G18EQDRBRQ1? The junction-to-ambient thermal resistance is 47.7 °C/W.
