April 4, 2008 LMTEMP 4

### NAME

lmtemp - National Semiconductor LM75, LM77 and compatible hardware monitors

### SYNOPSIS

lmtemp0 at iic? addr 0x48 flags 0x0000

### DESCRIPTION

The lmtemp driver provides support for the National Semiconductor LM on iicbus series temperatures and register compatible chips to be used with the envsys(4) API. The lmtemp supports ranges of the temperature between +125 from -55.

Each device is specified by the value of the address and flags.

Temperature | addr |  | flags
```LM75` | `0x48 - 0x4f` | `0x0000`
```DS75` | `0x48 - 0x4f` | `0x0001`
```LM77` | `0x48 - 0x4b` | `0x0002`

### HARDWARE

Chips supported by the lmtemp driver include:

  National Semiconductor LM75

  National Semiconductor LM77

  Dallas Semiconductor DS75

### SEE ALSO

envsys(4), envstat(8)

### HISTORY

The lmtemp device appeared in NetBSD4.0.

### BUGS

Interrupt support is unimplemented.