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Supported chips:

• National Semiconductor LM90

  Prefix: ‘lm90’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at the National Semiconductor website

• National Semiconductor LM89

  Prefix: ‘lm89’ (no auto-detection)

  Addresses scanned: I2C 0x4c and 0x4d

  Datasheet: Publicly available at the National Semiconductor website

• National Semiconductor LM99

  Prefix: ‘lm99’

  Addresses scanned: I2C 0x4c and 0x4d

  Datasheet: Publicly available at the National Semiconductor website

• National Semiconductor LM86

  Prefix: ‘lm86’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at the National Semiconductor website

• Analog Devices ADM1032

  Prefix: ‘adm1032’

  Addresses scanned: I2C 0x4c and 0x4d

  Datasheet: Publicly available at the ON Semiconductor website

• Analog Devices ADT7461

  Prefix: ‘adt7461’

  Addresses scanned: I2C 0x4c and 0x4d

  Datasheet: Publicly available at the ON Semiconductor website

• Analog Devices ADT7461A

  Prefix: ‘adt7461a’

  Addresses scanned: I2C 0x4c and 0x4d

  Datasheet: Publicly available at the ON Semiconductor website

• ON Semiconductor NCT1008

  Prefix: ‘nct1008’

  Addresses scanned: I2C 0x4c and 0x4d

  Datasheet: Publicly available at the ON Semiconductor website

• Maxim MAX6646

  Prefix: ‘max6646’

  Addresses scanned: I2C 0x4d

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6647

  Prefix: ‘max6646’

  Addresses scanned: I2C 0x4e

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6648

  Prefix: ‘max6646’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6649

  Prefix: ‘max6646’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6654

  Prefix: ‘max6654’

  Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6657

  Prefix: ‘max6657’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6658

  Prefix: ‘max6657’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6659

  Prefix: ‘max6659’

  Addresses scanned: I2C 0x4c, 0x4d, 0x4e

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6680

  Prefix: ‘max6680’

  Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6681

  Prefix: ‘max6680’

  Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6692

  Prefix: ‘max6646’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6695

  Prefix: ‘max6695’

  Addresses scanned: I2C 0x18

  Datasheet: Publicly available at the Maxim website

• Maxim MAX6696

  Prefix: ‘max6695’

  Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,

  Datasheet: Publicly available at the Maxim website

• Winbond/Nuvoton W83L771W/G

  Prefix: ‘w83l771’

  Addresses scanned: I2C 0x4c

  Datasheet: No longer available

• Winbond/Nuvoton W83L771AWG/ASG

  Prefix: ‘w83l771’

  Addresses scanned: I2C 0x4c

  Datasheet: Not publicly available, can be requested from Nuvoton

• Philips/NXP SA56004X

  Prefix: ‘sa56004’

  Addresses scanned: I2C 0x48 through 0x4F

  Datasheet: Publicly available at NXP website

• GMT G781

  Prefix: ‘g781’

  Addresses scanned: I2C 0x4c, 0x4d

  Datasheet: Not publicly available from GMT

• Texas Instruments TMP451

  Prefix: ‘tmp451’

  Addresses scanned: I2C 0x4c

  Datasheet: Publicly available at TI website

Author: Jean Delvare <jdelvare@suse.de>

Description¶

Lm90 software, free download

The LM90 is a digital temperature sensor. It senses its own temperature aswell as the temperature of up to one external diode. It is compatiblewith many other devices, many of which are supported by this driver.

Note that there is no easy way to differentiate between the MAX6657,MAX6658 and MAX6659 variants. The extra features of the MAX6659 are onlysupported by this driver if the chip is located at address 0x4d or 0x4e,or if the chip type is explicitly selected as max6659.The MAX6680 and MAX6681 only differ in their pinout, therefore they obviouslycan’t (and don’t need to) be distinguished.

The specificity of this family of chipsets over the ADM1021/LM84family is that it features critical limits with hysteresis, and anincreased resolution of the remote temperature measurement.

The different chipsets of the family are not strictly identical, althoughvery similar. For reference, here comes a non-exhaustive list of specificfeatures:

• Filter and alert configuration register at 0xBF.
• ALERT is triggered by temperatures over critical limits.

• Same as LM90
• Better external channel accuracy

• Same as LM89
• External temperature shifted by 16 degrees down

• Consecutive alert register at 0x22.
• Conversion averaging.
• Up to 64 conversions/s.
• ALERT is triggered by open remote sensor.
• SMBus PEC support for Write Byte and Receive Byte transactions.

• Extended temperature range (breaks compatibility)
• Lower resolution for remote temperature

• Better local resolution
• Selectable address
• Remote sensor type selection
• Extended temperature range
• Extended resolution only available when conversion rate <= 1 Hz

• Better local resolution
• Remote sensor type selection

• Better local resolution
• Selectable address
• Second critical temperature limit
• Remote sensor type selection

• Selectable address
• Remote sensor type selection

• Better local resolution
• Selectable address (max6696)
• Second critical temperature limit
• Two remote sensors

• The G variant is lead-free, otherwise similar to the W.
• Filter and alert configuration register at 0xBF
• Moving average (depending on conversion rate)

• Successor of the W83L771W/G, same features.
• The AWG and ASG variants only differ in package format.
• Diode ideality factor configuration (remote sensor) at 0xE3

• Better local resolution

All temperature values are given in degrees Celsius. Resolutionis 1.0 degree for the local temperature, 0.125 degree for the remotetemperature, except for the MAX6654, MAX6657, MAX6658 and MAX6659 which havea resolution of 0.125 degree for both temperatures.

Each sensor has its own high and low limits, plus a critical limit.Additionally, there is a relative hysteresis value common to both criticalvalues. To make life easier to user-space applications, two absolute valuesare exported, one for each channel, but these values are of course linked.Only the local hysteresis can be set from user-space, and the same deltaapplies to the remote hysteresis.

The lm90 driver will not update its values more frequently than configured withthe update_interval attribute; reading them more often will do no harm, but willreturn ‘old’ values.

SMBus Alert Support¶

Lm90 Download

This driver has basic support for SMBus alert. When an alert is received,the status register is read and the faulty temperature channel is logged.

The Analog Devices chips (ADM1032, ADT7461 and ADT7461A) and ONSemiconductor chips (NCT1008) do not implement the SMBus alert protocolproperly so additional care is needed: the ALERT output is disabled whenan alert is received, and is re-enabled only when the alarm is gone.Otherwise the chip would block alerts from other chips in the bus as longas the alarm is active.

PEC Support¶

Lm90 Software

The ADM1032 is the only chip of the family which supports PEC. It doesnot support PEC on all transactions though, so some care must be taken.

When reading a register value, the PEC byte is computed and sent by theADM1032 chip. However, in the case of a combined transaction (SMBus ReadByte), the ADM1032 computes the CRC value over only the second half ofthe message rather than its entirety, because it thinks the first halfof the message belongs to a different transaction. As a result, the CRCvalue differs from what the SMBus master expects, and all reads fail.

For this reason, the lm90 driver will enable PEC for the ADM1032 only ifthe bus supports the SMBus Send Byte and Receive Byte transaction types.These transactions will be used to read register values, instead ofSMBus Read Byte, and PEC will work properly.

Additionally, the ADM1032 doesn’t support SMBus Send Byte with PEC.Instead, it will try to write the PEC value to the register (because theSMBus Send Byte transaction with PEC is similar to a Write Byte transactionwithout PEC), which is not what we want. Thus, PEC is explicitly disabledon SMBus Send Byte transactions in the lm90 driver.

PEC on byte data transactions represents a significant increase in bandwidthusage (+33% for writes, +25% for reads) in normal conditions. With the needto use two SMBus transaction for reads, this overhead jumps to +50%. Worse,two transactions will typically mean twice as much delay waiting fortransaction completion, effectively doubling the register cache refresh time.I guess reliability comes at a price, but it’s quite expensive this time.

So, as not everyone might enjoy the slowdown, PEC can be disabled throughsysfs. Just write 0 to the “pec” file and PEC will be disabled. Write 1to that file to enable PEC again.