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Hello, Please ask a question about MCP9509 Datasheet
# Example questions:
➢ Explain the functional difference between these two options.
➢ What is the purpose of the hyst input pin, and how does changing its state affect the device's behavior?
➢ What two methods are presented for determining the temperature threshold (tset)?
| Part No. | MCP9509 |
| Manufacturer | MICROCHIP |
| Size | 335 Kbytes |
| Pages | 28 pages |
| Description | Resistor-Programmable Temperature Switches |
1. Device Overview & Functionality:
️· Device: The document describes the MCP9509 and MCP9510 temperature switches.
️· Purpose: These are temperature-sensing devices that assert a logic signal when the temperature crosses a user-programmable threshold.
️· Programming: The alert threshold is set using an external resistor (R<sub>SET</sub>).
️· Output Configurations:
- MCP9509: Has an Open-Drain output requiring an external pull-up resistor.
- MCP9510: Offers three selectable output configurations: Active-Low Push-Pull, Active-Low Open-Drain (with internal 100 kΩ pull-up), and Active-High Push-Pull. This is controlled by the OUTSET pin.
️· Hysteresis: Both devices offer selectable hysteresis (2°C or 10°C) controlled by the HYST pin.
️· Sensor Options: Available in "Hot" and "Cold" versions:
- Hot: Detects rising temperature.
- Cold: Detects falling temperature.
2. OUTSET Pin & Output Configuration (MCP9510):
️· Function: Controls the output configuration (Active-Low/High, Push-Pull/Open-Drain).
️· Input Resistance: Z<sub>OUTSET</sub> is determined by an internal 1 MΩ resistor (R<sub>A</sub>).
️· Leakage Current Considerations: Leakage current is a factor when connecting voltage sources to the OUTSET pin to change the output configuration.
3. HYST Pin (Hysteresis Selection):
️· Function: Selects the hysteresis level (2°C or 10°C).
️· Impact: Influences the temperature range over which the output remains asserted after crossing the threshold. Wider hysteresis prevents rapid switching due to minor temperature fluctuations.
4. R<sub>SET</sub> and Temperature Thresholds:
️· R<sub>SET</sub>: The external resistor used to program the temperature threshold (T<sub>SET</sub>).
️· Equations: Provided are two equations (EQUATION 4-1 and EQUATION 4-2) to convert between R<sub>SET</sub> and T<sub>SET</sub>. The coefficients used in these equations depend on whether the device is "Hot" or "Cold."
️· Tables: Table 4-1 lists the coefficients used in the conversion equations. Table 4-2/4-3 provide a lookup table for common R<sub>SET</sub> and T<sub>SET</sub> values (depending on Hot/Cold configuration).
5. Key Parameters and Coefficients (From Table 4-1):
️· CR1, CR2, CR3: Temperature to Resistance conversion coefficients.
️· CT1, CT2, CT3: Resistance to Temperature conversion coefficients.
️· R1, R2, R3: Resistance values used in equations.
️· T1, T2: Temperature values used in equations.
Important Considerations/Takeaways:
️· External Components: Requires an external resistor (R<sub>SET</sub>) and potentially a pull-up resistor (for the MCP9509's Open-Drain output).
️· Coefficient Dependence: The equations relating resistance and temperature are *highly dependent* on the device's Hot/Cold configuration. Always use the correct coefficients.
️· OUTSET Pin Considerations: Be mindful of leakage current when connecting to the OUTSET pin.
️· Table 4-2/4-3: Use the lookup tables (4-2/4-3) for quick design estimates before using the full equations.
1. Device Overview & Functionality:
️· Device: The document describes the MCP9509 and MCP9510 temperature switches.
️· Purpose: These are temperature-sensing devices that assert a logic signal when the temperature crosses a user-programmable threshold.
️· Programming: The alert threshold is set using an external resistor (R<sub>SET</sub>).
️· Output Configurations:
- MCP9509: Has an Open-Drain output requiring an external pull-up resistor.
- MCP9510: Offers three selectable output configurations: Active-Low Push-Pull, Active-Low Open-Drain (with internal 100 kΩ pull-up), and Active-High Push-Pull. This is controlled by the OUTSET pin.
️· Hysteresis: Both devices offer selectable hysteresis (2°C or 10°C) controlled by the HYST pin.
️· Sensor Options: Available in "Hot" and "Cold" versions:
- Hot: Detects rising temperature.
- Cold: Detects falling temperature.
2. OUTSET Pin & Output Configuration (MCP9510):
️· Function: Controls the output configuration (Active-Low/High, Push-Pull/Open-Drain).
️· Input Resistance: Z<sub>OUTSET</sub> is determined by an internal 1 MΩ resistor (R<sub>A</sub>).
️· Leakage Current Considerations: Leakage current is a factor when connecting voltage sources to the OUTSET pin to change the output configuration.
3. HYST Pin (Hysteresis Selection):
️· Function: Selects the hysteresis level (2°C or 10°C).
️· Impact: Influences the temperature range over which the output remains asserted after crossing the threshold. Wider hysteresis prevents rapid switching due to minor temperature fluctuations.
4. R<sub>SET</sub> and Temperature Thresholds:
️· R<sub>SET</sub>: The external resistor used to program the temperature threshold (T<sub>SET</sub>).
️· Equations: Provided are two equations (EQUATION 4-1 and EQUATION 4-2) to convert between R<sub>SET</sub> and T<sub>SET</sub>. The coefficients used in these equations depend on whether the device is "Hot" or "Cold."
️· Tables: Table 4-1 lists the coefficients used in the conversion equations. Table 4-2/4-3 provide a lookup table for common R<sub>SET</sub> and T<sub>SET</sub> values (depending on Hot/Cold configuration).
5. Key Parameters and Coefficients (From Table 4-1):
️· CR1, CR2, CR3: Temperature to Resistance conversion coefficients.
️· CT1, CT2, CT3: Resistance to Temperature conversion coefficients.
️· R1, R2, R3: Resistance values used in equations.
️· T1, T2: Temperature values used in equations.
Important Considerations/Takeaways:
️· External Components: Requires an external resistor (R<sub>SET</sub>) and potentially a pull-up resistor (for the MCP9509's Open-Drain output).
️· Coefficient Dependence: The equations relating resistance and temperature are *highly dependent* on the device's Hot/Cold configuration. Always use the correct coefficients.
️· OUTSET Pin Considerations: Be mindful of leakage current when connecting to the OUTSET pin.
️· Table 4-2/4-3: Use the lookup tables (4-2/4-3) for quick design estimates before using the full equations.
| Part No. | MCP9509 |
| Manufacturer | MICROCHIP |
| Size | 335 Kbytes |
| Pages | 28 pages |
| Description | Resistor-Programmable Temperature Switches |
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