Datasheet
LM96000
SNAS234C –APRIL 2004–REVISED MARCH 2013
www.ti.com
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
75h R/W Fan RES RES RES RES RES PWM3 PWM2 PWM1 7h ✓
Spin-up SU SU SU
Mode
4.1 Register 20-24h: Voltage Reading
Register Read/ Register Bit 7 Bit 0 Default
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Address Write Name (MSB) (LSB) Value
20h R 2.5V 7 6 5 4 3 2 1 0 N/A
21h R VCCP 7 6 5 4 3 2 1 0 N/A
22h R 3.3V 7 6 5 4 3 2 1 0 N/A
23h R 5V 7 6 5 4 3 2 1 0 N/A
24h R 12V 7 6 5 4 3 2 1 0 N/A
The Register Names difine the typical input voltage at which the reading is ¾ full scale or C0h.
The Voltage Reading registers are updated automatically by the LM96000 at a minimum frequency of 4 Hz.
These registers are read only — a write to these registers has no effect.
4.2 Register 25-27h: Temperature Reading
Register Read/ Register Bit 7 Bit 0 Default
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Address Write Name (MSB) (LSB) Value
25h R Processo 7 6 5 4 3 2 1 0 N/A
r (Zone1)
Temp
26h R Internal 7 6 5 4 3 2 1 0 N/A
(Zone2)
Temp
27h R Remote 7 6 5 4 3 2 1 0 N/A
(Zone3)
Temp
The Temperature Reading registers reflect the current temperatures of the internal and remote diodes. Processor
(Zone1) Temp register reports the temperature measured by the thermal diode connected to the Remote1− and
Remote1+ pins, Remote (Zone3) Temp register reports the temperature measured by the thermal diode
connected to the the Remote2− and Remote2+ pins, and the Internal (Zone2) Temp register reports the
temperature measured by the internal (junction) temperature sensor. Temperatures are represented as 8 bit, 2’s
complement, signed numbers, in Celsius, as shown below in Table 1. The Temperature Reading register will
return a value of 80h if the remote diode pins are not used by the board designer or are not functioning properly.
This reading will cause the zone limit bit(s) (bits 6 and 4) in the Interrupt Status Register (41h) and the remote
diode fault status bit(s) (bit 6 or 7) in the Interrupt Status Register 2 (42h) to be set. The Temperature Reading
registers are updated automatically by the LM96000 at a minimum frequency of 4 Hz. These registers are read
only — a write to these registers has no effect.
Table 1. Temperature vs Register Reading
Temperature Reading (Dec) Reading (Hex)
−127°C −127 81h
. . .
. . .
. . .
−50°C −50 CEh
. . .
. . .
. . .
0°C 0 00h
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