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MCP9509H Datasheet(PDF) 11 Page - Microchip Technology |
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MCP9509H Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 28 page  © 2008 Microchip Technology Inc. DS22114A-page 11 MCP9509/10 4.0 FUNCTIONAL DESCRIPTION The MCP9509/10 integrates a temperature switch with a user programmable threshold. The temperature switch threshold or alert limit is programmed using an external resistor RSET. A logic signal is asserted when the die temperature crosses the programmed alert limit. The MCP9509 has an Open-Drain output which requires an external pull-up resistor for operation. The MCP9510 output can be configured to three user selectable output configurations. The OUTSET pin is used to select Active-Low Push-Pull, Active-Low Open-Drain (with internal 100 k Ω pull-up resistor), Active-High Push-Pull output configurations. In addi- tion, this device provides user selectable hysteresis of 2°C and 10°C (typical). 4.1 SET Input Pin The SET input pin is used to connect an external resistor RSET. The resistor sets the alert threshold. The SET pin outputs a constant current ISET (~5 µA) to bias RSET (Shown in Figure 4-1). The voltage across RSET, VSET, is compared to an internal thermal diode. FIGURE 4-1: SET input. When the thermal diode voltage exceeds VSET, the sensor output asserts. The assert polarity is determined by the state of the OUTSET pin. 4.2 MCP9510 OUTSET Input Pin This pin is used to select the device output configura- tion. This feature enables in-circuit device output con- figuration by driving this pin with a microcontroller I/O pin to Output-HIGH, Output-LOW, or High-Impedance input. Figure 4-4 shows the configuration and output conditions. The input structure of this pin consists of a resistor lad- der and comparators to determine OUTSET level threshold. Figure 4-2 shows the circuit configuration. The OUTSET input resistance must be carefully considered for leakage current when connecting volt- age source to change output configuration. FIGURE 4-2: MCP9510 OUTSET Input Structure. The OUTSET pin input impedance ZOUTSET is set by the internal resistance RA = 1 MΩ (typical). The input structure is a voltage divider network from VDD. Therefore, the leakage current on the OUTSET pin is a function of change in VDD and the VOSET. 4.3 HYST Input Pin (Hysteresis Select) The MCP9509/10 family has a user selectable hysteresis input pin HYST. Hysteresis can be externally selected to either 2°C (HYST = GND) or 10°C (HYST = VDD). Figure 4-3 shows graphical description of change in hysteresis. For example, if the alert temperature threshold is set to TSET = 100°C (RSET = 16.1 kΩ) with an Active-Low out- put configuration, the output asserts Low when temper- ature exceeds 100°C ± TACY. The output remains asserted Low until temperautre falls below THYST, 98°C (HYST = GND) or 90°C (HYST = VDD). FIGURE 4-3: Output Hysteresis. SET RSET VSET ISET Rx + - OUT/ OUT Thermal Diode VDD + - - + OUTSET Pin RA RA R1 R2 R3 MCP9510 Cold Hot TSET THYST Temperature V 10°C Typical Hysteresis 2°C Typical Hysteresis |
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