Overview
The STM1001MWX6F is a microprocessor reset circuit manufactured by STMicroelectronics. It is a low-power supervisory device designed to monitor power supplies and assert a reset signal to the microcontroller (MCU) whenever the VCC supply voltage drops below a preset threshold. The device ensures the reset signal is maintained until the VCC has risen above the threshold for a minimum period of time (trec), providing reliable power-on reset functionality.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage (VCC) | 1.0 to 5.5 | V |
| Reset Threshold (VRST) | Dependent on version (e.g., 4.56-4.70 V for STM1001L) | V |
| Reset Pulse Width (trec) | 140 ms (min) | ms |
| Supply Current (ICC) | 6 µA (typ) | µA |
| Operating Temperature | –40 to 85 °C | °C |
| Package Type | SOT23-3 (WX) | |
| RST Output Type | Open Drain | |
| RST Assertion Down to VCC | 1.0 V | V |
Key Features
- Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages
- Open drain RST output
- Reset pulse width of 30 ms or 140 ms (min)
- Low supply current - 6 µA (typ)
- Guaranteed RST assertion down to VCC = 1.0 V
- Operating temperature range: –40 °C to 85 °C (industrial grade)
- Lead-free, small SOT23 package
Applications
The STM1001MWX6F is suitable for various industrial and embedded systems applications where reliable power-on reset functionality is crucial. It can be used in microcontroller-based systems, industrial control systems, and any application requiring precise monitoring of power supply voltages.
Q & A
- What is the primary function of the STM1001MWX6F?
The primary function is to monitor the power supply voltage and assert a reset signal to the MCU if the voltage drops below a preset threshold.
- What are the supported supply voltages for the STM1001MWX6F?
The device supports precision monitoring of 3 V, 3.3 V, and 5 V supply voltages.
- What is the typical supply current of the STM1001MWX6F?
The typical supply current is 6 µA.
- What is the operating temperature range of the STM1001MWX6F?
The operating temperature range is –40 °C to 85 °C (industrial grade).
- What type of package does the STM1001MWX6F come in?
The device comes in a lead-free, small SOT23-3 package.
- How does the RST output of the STM1001MWX6F work?
The RST output is an open drain type and requires a pull-up resistor. It asserts a reset signal when VCC drops below the reset threshold and remains low for at least the reset time-out period.
- What is the minimum reset pulse width of the STM1001MWX6F?
The minimum reset pulse width is 140 ms.
- Is the STM1001MWX6F guaranteed to assert RST at low VCC levels?
Yes, the RST is guaranteed to be asserted down to VCC = 1.0 V.
- How does the device handle power-up and power-down scenarios?
During power-up, the device keeps RST low for the reset time-out period after VCC exceeds the reset threshold. During power-down, the internal timer clears if VCC drops below the reset threshold.
- What kind of transient immunity does the STM1001MWX6F offer?
The device provides transient immunity with a 0.1 µF bypass capacitor mounted close to the VCC pin, and glitches of 100 ns or less typically do not generate a reset pulse.
