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EMC2113 Datasheet(PDF) 24 Page - Microchip Technology |
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EMC2113 Datasheet(HTML) 24 Page - Microchip Technology |
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24 / 88 page  RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown Datasheet DS20005251A-page 24 2013 Microchip Technology Inc. When the SYS_SHDN pin is asserted, it will remain asserted until the measured temperatures drop below the respective limits minus the hysteresis. At this point, the pin will be released automatically. 6.1.2 SHDN_SEL Pin The EMC2113 has a ‘strappable’ input (SHDN_SEL) allowing for configuration of the hardware Critical/Thermal Shutdown input channel. The pull-up resistor used on this pin identifies which configuration setting is used as shown in Table 6.1, "SHDN_SEL Pin Decode". . APPLICATION NOTE: The SHDN_SEL pin decode settings with Beta Compensation enabled (auto) will support a diode connected 2N3904 diode normally. 6.1.3 TRIP_SET Pin The EMC2113’s TRIP_SET pin is an analog input to the Critical/Thermal Shutdown block which sets the Thermal Shutdown temperature. The system designer creates a voltage level at the input through a simple resistor connected to GND as shown in Figure 6.2, "Block Diagram of Critical/Thermal Shutdown". The value of this resistor is used to create an input voltage on the TRIP_SET pin which is translated into a temperature ranging from 65°C to 127°C. APPLICATION NOTE: Current only flows when the TRIP_SET pin is being monitored. At all other times, the internal reference voltage is removed and the TRIP_SET pin will be pulled down to ground. Table 6.1 SHDN_SEL Pin Decode PULL UP RESISTOR MODE / DIODE CHANNEL EXTERNAL DIODE 1 CONFIG EXTERNAL DIODE 2 CONFIG < 4.7k Ohm AMD CPU on External Diode 1 Beta Compensation disabled REC disabled Beta and REC controls are locked Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked 6.8k Ohm 2N3904 on External Diode 1 Beta Compensation disabled REC enabled Beta and REC controls are locked Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked 10k Ohm Intel CPU or 2N3904 on External Diode 1 Beta Compensation enabled (auto) REC enabled Beta and REC controls are locked Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked 15k Ohm Internal Diode Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked 22k Ohm Intel CPU or 2N3904 on External Diode 2 Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked Beta Compensation enabled (auto) REC enabled Beta and REC controls are locked > 33k Ohm Intel CPU or 2N3904 on External Diode 1 Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked Beta Compensation enabled (auto) REC enabled Beta and REC controls are not locked |
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