TDA(4) | Device Drivers Manual (sparc64) | TDA(4)

# NAME

`tda` —
TDA8444 fan speed controller

# SYNOPSIS

`tda0 at iic1 addr 0x24: fan-control`

# DESCRIPTION

The `tda` driver provides support for the TDA8444 DAC used to control the fan speeds in Sun Blade 1000 and Blade 2000 systems. The speed of the CPU fan and of the system fan are automatically adjusted every 60 seconds, based on the currently reported CPU and system temperatures, respectively.

The speed-related values are made available through the envstat(8) interface. The range of the values are:

| Minimum | Maximum
`CPU temperature` | <=57 | >=67
`System temperature` | <=20 | >=30
`Speed value` | 12 | 63

# SEE ALSO

admtemp(4), envstat(8)

# BUGS

The temperatures are reported as ‘internal’ and ‘external’ instead of ‘system’ and ‘CPU’, respectively.

February 2, 2013 | NetBSD 10.0