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60 lines
2.3 KiB
60 lines
2.3 KiB
Kernel driver adm1025 |
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===================== |
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Supported chips: |
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* Analog Devices ADM1025, ADM1025A |
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Prefix: 'adm1025' |
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Addresses scanned: I2C 0x2c - 0x2e |
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Datasheet: Publicly available at the Analog Devices website |
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* Philips NE1619 |
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Prefix: 'ne1619' |
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Addresses scanned: I2C 0x2c - 0x2d |
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Datasheet: Publicly available at the Philips website |
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The NE1619 presents some differences with the original ADM1025: |
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* Only two possible addresses (0x2c - 0x2d). |
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* No temperature offset register, but we don't use it anyway. |
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* No INT mode for pin 16. We don't play with it anyway. |
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Authors: |
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- Chen-Yuan Wu <[email protected]>, |
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- Jean Delvare <[email protected]> |
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Description |
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----------- |
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(This is from Analog Devices.) The ADM1025 is a complete system hardware |
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monitor for microprocessor-based systems, providing measurement and limit |
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comparison of various system parameters. Five voltage measurement inputs |
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are provided, for monitoring +2.5V, +3.3V, +5V and +12V power supplies and |
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the processor core voltage. The ADM1025 can monitor a sixth power-supply |
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voltage by measuring its own VCC. One input (two pins) is dedicated to a |
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remote temperature-sensing diode and an on-chip temperature sensor allows |
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ambient temperature to be monitored. |
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One specificity of this chip is that the pin 11 can be hardwired in two |
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different manners. It can act as the +12V power-supply voltage analog |
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input, or as the a fifth digital entry for the VID reading (bit 4). It's |
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kind of strange since both are useful, and the reason for designing the |
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chip that way is obscure at least to me. The bit 5 of the configuration |
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register can be used to define how the chip is hardwired. Please note that |
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it is not a choice you have to make as the user. The choice was already |
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made by your motherboard's maker. If the configuration bit isn't set |
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properly, you'll have a wrong +12V reading or a wrong VID reading. The way |
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the driver handles that is to preserve this bit through the initialization |
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process, assuming that the BIOS set it up properly beforehand. If it turns |
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out not to be true in some cases, we'll provide a module parameter to force |
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modes. |
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This driver also supports the ADM1025A, which differs from the ADM1025 |
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only in that it has "open-drain VID inputs while the ADM1025 has on-chip |
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100k pull-ups on the VID inputs". It doesn't make any difference for us.
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