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EMC2301 数据表(PDF) 13 Page - Microchip Technology |
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EMC2301 数据表(HTML) 13 Page - Microchip Technology |
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13 / 70 page  2021 Microchip Technology Inc. DS20006532A-page 13 EMC2301/2/3/5 4.0 PRODUCT DESCRIPTION The EMC2301/2/3/5 family is an SMBus compliant fan controller with up to five programmable frequency PWM fan drivers. The fan drivers can be operated using two modes: the RPM-based Fan Speed Control algorithm or the direct fan drive setting. Figure 4-1 shows a system diagram of the EMC2301/2/3/5 family. FIGURE 4-1: EMC2301/2/3/5 Family System Diagram. 4.1 Fan Control Modes of Operation The EMC2301/2/3/5 has two modes of operation for each fan driver. Each mode of operation uses the Ramp Rate control and Spin Up Routine. 1. Direct Setting mode - in this mode of operation, the user directly controls the fan drive setting. Updating the Fan Driver Setting Register (see Register 6-11) will instantly update the PWM fan drive. Ramp rate control is optional and enabled via the ENRCx bits (see Register 6-14). Whenever the Direct Setting mode is enabled, the current drive will be changed to what was last written into the Fan Driver Setting Register. The conversion from register value to percent drive in shown in Equation 4-1. EQUATION 4-1: REGISTER VALUE TO DRIVE 2. Fan Speed Control (FSC) mode - in this mode of operation, the user determines a target tachom- eter count and the PWM drive setting is auto- matically updated to achieve this target speed. The algorithm uses the Spin Up Routine and has user-definable ramp rate controls. This mode is enabled setting the ENAGx bit in the Fan Configuration Register (see Register 6-13). EMC230x SMCLK SMDATA ALERT# VDD 3.3V MCU ADDR_SEL GND 32.768 Hz Clock Input or Output CLK TACH5 tachometer PWM5 Drive Circuit TACH2 tachometer PWM2 Drive Circuit TACH1 tachometer PWM1 Drive Circuit Drive VALUE 255 ------------------ 100% = |
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