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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM79 bảng dữ liệu(PDF) 28 Page - National Semiconductor (TI) |
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LM79 bảng dữ liệu(HTML) 28 Page - National Semiconductor (TI) |
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28 / 31 page  Functional Description (Continued) 13.10 VID/Fan Divisor Register — Address 47h Power on – <7:4> is 0101, and <3:0>is mapped to VID <3:0> Bit Name Read/Write Description 3-0 VID <3:0> Read Only The VID <3:0> inputs 5-4 FAN1 RPM Control Read/Write FAN1 Speed Control. <5:4> = 00 - divide by 1; <5:4> = 01 - divide by 2; <5:4> = 10 - divide by 4; <5:4> = 11 - divide by 8. 7-6 FAN2 RPM Control Read/Write FAN2 Speed Control. <7:6> = 00 - divide by 1; <7:6> = 01 - divide by 2; <7:6> = 10 - divide by 4; <7:6> = 11 - divide by 8. 13.11 Serial Bus Address Register — Address 48h Power on default Serial Bus address <6:0> = 0101101 and <7> = 0 binary Bit Name Read/Write Description 6-0 Serial Bus Address Read/Write Serial Bus address <6:0> 7 Reserved Read Only 13.12 Chip Reset/VID4/Device ID Register Address 49h Power on default for the latest version of LM79 <7:0> = 1100 000X. Bit Name Read/Write Description 0 VID4 Read Only VID4 input 4-1 Reserved Read Only 5 Chip Reset Read/Write A one will reset all the registers of the LM79 to the power on default state. 6 Reserved Read Only 7 Device ID Read Only LM79 device identification. The LM78 has <7> =0. 13.13 POST RAM — Address 00h–1Fh The address pointer for the POST RAM auto-increments when written to at Port x0h or x4h. Once the address pointer reaches 1Fh, a FIFO overflow interrupt will be generated and the FIFO will stop incrementing. Normal reads via Port x5h and x6h auto-increment a separate pointer, and will not cause a FIFO overflow interrupt. 13.14 Value RAM — Address 20h–3Fh or 60h–7Fh (auto-increment) Address A6–A0 Address A6–A0 with Auto-Increment Description 20h 60h IN0 reading 21h 61h IN1 reading 22h 62h IN2 reading 23h 63h IN3 reading 24h 64h IN4 reading 25h 65h -IN5 reading 26h 66h -IN6 reading 27h 67h Temperature reading 28h 68h FAN1 reading www.national.com 28 |
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