LM96000EVAL/NOPB National Semiconductor, LM96000EVAL/NOPB Datasheet - Page 15

• Manufacturer Part Number: LM96000EVAL/NOPB
• Description: BOARD EVALUATION LM96000
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM96000EVAL/NOPB

• Sensor Type: Temperature, Fan Controller
• Sensing Range: 0°C ~ 125°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: LM96000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM96000EVAL

Register
Address
40h
Bit
0
1
2
3
4–7
4.7 Register 40h: Ready/Lock/Start/Override
Name
START
LOCK
READY
OVRID
Reserved
Read/
Write
R/W
Register
Name
Ready/Lock/Start/Override
R/W
R/W
R/W
R
R/W
R
Default
0
0
0
0
Description
When software writes a 1 to this bit, the LM96000 fan monitoring and PWM output
control functions will use the values set in the fan control limit and parameter registers
(address 5Ch through 6Eh). Before this bit is set, the LM96000 will not update the used
register values, the default values will remain in effect. Whenever this bit is set to 0, the
LM96000 fan monitoring and PWM output control functions use the default fan limits
and parameters, regardless of the current values in the limit and parameter registers
(5C through 6Eh). The LM96000 will preserve the values currently stored in the limit and
parameter registers when this bit is set or cleared. This bit is not effected by the state
of the Lock bit.
It is expected that all limit and parameter registers will be set by BIOS or application
software prior to setting this bit.
Setting this bit to 1 locks specified limit and parameter registers. Once this bit is set, limit
and parameter registers become read only and will remain locked until the device is
powered off. This register bit becomes read only once it is set.
The LM96000 sets this bit automatically after the part is fully powered up, has completed
the power-up-reset process, and after all A/D converters are properly functioning.
If this bit is set to 1, all PWM outputs will go to 100% duty cycle regardless of whether
or not the lock bit is set. The OVRID bit has precedence over the disabled mode.
Therefore, when OVRID is set the PWM will go to 100% even if the PWM is in the
disabled mode.
Reserved
Bit 7
(MSB)
RES
Bit 6 Bit 5 Bit 4 Bit 3
RES
15
RES
RES
OVRID
Bit 2
READY
Bit 1
LOCK
Bit 0
(LSB)
START
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Default
Value
00h