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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AMC6821 데이터시트(PDF) 34 Page - Texas Instruments |
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AMC6821 데이터시트(HTML) 34 Page - Texas Instruments |
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34 / 54 page  www.ti.com AMC6821 SBAS386C – MAY 2006 – REVISED JULY 2007 Table 14. Memory Map (continued) ADDR NAME R/W DEFAULT BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 TEMPERATURE MONITORING (continued) 0 0 PSV8 PSV7 PSV6 PSV5 PSV4 PSV3 0x1C PSV-Temp R/W 0x00 Passive Cooling Temperature threshold. 3 LSBs and two MSBs are '0'. For details, refer to the passive cooling temperature limit in the Temperature Out-of-Range Detection section. Default = 0 °C. RT-C10 RT-C9 RT-C8 RT-C7 RT-C6 RT-C5 RT-C4 RT-C3 0x1D Remote-Critical-Temp R/W 0x69 The 8 MSBs of Remote Critical temperature shutdown threshold. 3 LSBs are '0'. When the Remote-Temp is equal to or above this limit, an RCRT interrupt occurs and OVR goes low. Default = +105 °C. PWM CONTROLLER FSPD 0 PWM2 PWM1 PWM0 STIME2 STIME1 STIME0 0x20 FAN-Characteristics R/W 0x1D Spin Dis PWM Frequency Setting Spin-Up Time Setting L-DCY7 L-DCY6 L-DCY5 L-DCY4 L-DCY3 L-DCY2 L-DCY1 L-DCY0 0x21 DCY-Low-Temp R/W 0x55 The duty cycle of PWM when the temperature is equal to or below Low-Temp in Auto Temp-Fan Control mode. Default = 0x55, 33.2%. DCY7 (MSB) DCY6 DCY5 DCY4 DCY3 DCY2 DCY1 DCY0 Actual Duty cycle of PWM output. The duty cycle changes immediately after new data are written into this register. 8-bit, 0.39%/bit, range 0%-100%. Default = 33%. In read operation, the returned data are the actual DCY value driving the PWM-Out pin with two exceptions. Refer to the 0x22 DCY (Duty Cycle) R/W 0x55 DCY Register section. In write operation, the data written are the actual DCY value driving the PWM-Out pin in Software-DCY control mode. In all other control modes, the data are not used to drive the PWM. Instead, they are stored in a temporary register, and used to control the PWM immediately after the control mode is changed to software-DCY control. RAMPE STEP1 STEP0 RATE2 RATE1 RATE0 THRE1 THRE0 0x23 DCY-RAMP R/W 0x52 DCY Adjustment Step in DCY Update Rate in Auto Temp-Fan Adjustment Threshold in Ramp Enable Auto Fan Control Control Auto Temp-Fan Control L-TEMP4 L-TEMP3 L-TEMP2 L-TEMP1 L-TEMP0 L-SLP2 L-SLP1 L-SLP0 0x24 Local Temp-Fan Control (1) R/W 0x41 Low-Temp in Auto Local Temp-Fan control. Slope in Auto Local Temp-Fan control. R-TEMP4 R-TEMP3 R-TEMP2 R-TEMP1 R-TEMP0 R-SLP2 R-SLP1 R-SLP0 0x25 Remote Temp-Fan Control R/W 0x61 Low-Temp in Auto Remote Temp-Fan control. Slope in Auto Remote Temp-Fan control. TACH (RPM) MEASUREMENT TACH- TACH- TACH- TACH- TACH- TACH- TACH- TACH- DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 0x08 TACH-DATA-LByte R 0x00 Low byte of TACH measurement. TACH- TACH- TACH- TACH- TACH- TACH- TACH- TACH- DATA15 DATA14 DATA13 DATA12 DATA11 DATA10 DATA9 DATA8 0x09 TACH-DATA-HByte R 0x00 High byte of TACH measurement. TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- Limit7 Limit6 Limit5 Limit4 Limit3 Limit2 Limit1 Limit0 0x10 TACH-Low-Limit-LByte R/W 0xFF Low byte of TACH count limit corresponding to minimum allowed RPM. Since the TACH circuit counts between TACH pulses, a slow fan results in a larger measured value. When the measured value is larger than TACH-Low-Limit, the fan runs below the allowed minimum speed limit. TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- TACH-Low- Limit15 Limit14 Limit13 Limit12 Limit11 Limit10 Limit9 Limit8 0x11 TACH-Low-Limit-HByte R/W 0xFF High byte of TACH Limit corresponding to minimum allowed RPM. TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- Limit7 Limit6 Limit5 Limit4 Limit3 Limit2 Limit1 Limit0 0x12 TACH-High-Limit-LByte R/W 0x00 Low byte of TACH count Limit corresponding to maximum allowed RPM. Since the TACH circuit counts between TACH pulses, a fast fan results in a small measured value. When the measurement is less than this limit, the fan runs above the allowed maximum speed limit. TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- TACH-High- Limit15 Limit14 Limit13 Limit12 Limit11 Limit10 Limit9 Limit8 0x13 TACH-High-Limit-HByte R/W 0x00 High byte of TACH limit corresponding to maximum allowed RPM. TACH- TACH- TACH- TACH- TACH- TACH- TACH- TACH- SETTING7 SETTING6 SETTING5 SETTING4 SETTING3 SETTING2 SETTING1 SETTING0 0x1E TACH-SETTING-LByte R/W 0xFF Low byte of TACH value corresponding to the predetermined target fan speed. TACH-SETTING must be not greater than the value corresponding to the RPM for 30% duty cycle when the TACH-MODE bit is cleared ('0'). TACH- TACH- TACH- TACH- TACH- TACH- TACH- TACH- SETTING15 SETTING14 SETTING13 SETTING12 SETTING11 SETTING10 SETTING9 SETTING8 0x1F TACH-SETTING-HByte R/W 0xFF High byte of TACH value corresponding to the predetermined fan speed. TACH-SETTING must be not greater than the value corresponding to the RPM for 30% duty cycle when the TACH-MODE bit is cleared ('0'). 0x3A Reserved R 0x00 Always read '0'. 0x3B Reserved R 0x00 Always read '0'. (1) Used to calculate the target PWM duty cycle for local temperature in maximum fast-speed calculated control. 34 Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Link(s): AMC6821 |
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