Datasheet

LM96000
SNAS234C –APRIL 2004–REVISED MARCH 2013 www.ti.com
4.19 Registers 6A-6Ch: Absolute Temperature Limit
Register Read/ Register Bit 7 Bit 0 Default
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Lock?
Address Write Name (MSB) (LSB) Value
6Ah R/W Zone1 7 6 5 4 3 2 1 0 64h ✓
Absolute
Temp
Limit
6Bh R/W Zone2 7 6 5 4 3 2 1 0 64h ✓
Absolute
Temp
Limit
6Ch R/W Zone3 7 6 5 4 3 2 1 0 64h ✓
Absolute
Temp
Limit
In the Auto Fan mode, if a zone exceeds the temperature set in the Absolute Temperature Limit register, all of
the PWM outputs will incresase its duty cycle to 100%. This is a safety feature that attempts to cool the system if
there is a potentially catastrophic thermal event. If set to 80h (-128°C), the feature is disabled.
Default=100°C=64h
These registers become Read Only when the Ready/Lock/Start/Override register Lock bit is set. Any further
attempts to write to these registers shall have no effect. After power up the default values are used whenever the
Ready/Lock/Start/Override register Start bit is cleared even though modifications to these registers are possible.
Table 11. Absolute Limit vs Register Setting
Temperature Reading (Decimal) Reading (Hex)
−127°C −127 81h
. . .
. . .
. . .
−50°C −50 CEh
. . .
. . .
. . .
0°C 0 00h
. . .
. . .
. . .
50°C 50 32h
. . .
. . .
. . .
127°C 127 7Fh
4.20 Registers 6D-6Eh: Zone Hysteresis Registers
Register Read/ Register Bit 7 Bit 0 Default
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Lock?
Address Write Name (MSB) (LSB) Value
6Dh R/W Zone1 H1-3 H1-2 H1-1 H1-0 H2-3 H2-2 H2-1 H2-0 44h ✓
and
Zone2
Hysteres
is
6Eh R/W Zone3 H3-3 H3-2 H3-1 H3-0 RES RES RES RES 40h ✓
Hysteres
is
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