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EMC2300 Datasheet(PDF) 54 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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EMC2300 Datasheet(HTML) 54 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
54
SMSC EMC2300
DATASHEET
Note: There is a start-up time of up to 82ms for monitoring after the start bit is set to ‘1’, during which
time the reading registers are not valid.
The following summarizes the operation of the part based on the Start bit:
1. If Start bit = '0' then:
a. Fans are set to Full On.
b. No voltage, temperature, or fan tach monitoring is performed. The values in the reading registers
will be N/A (Not Applicable), which means these values will not be considered valid readings until
the Start bit = '1'. The exception to this is the Tachometer reading registers, which always give the
actual reading on the TACH pins.
c. No Status bits are set.
2. If Start bit = '1'
d. All fan control and monitoring will be based on the current values in the registers. There is no need
to preserve the default values after software has programmed these registers because no
monitoring or auto fan control will be done when Start bit = '0'.
e. Status bits may be set.
f. Setting the START bit to 1 does not prevent the limit and parameter registers from being written.
Note: Once programmed, the register values will be saved when start bit is reset to ‘0’.
Table 8.12 Ready/Lock/Start Monitoring
BIT
NAME
R/W
DEFAULT
DESCRIPTION
0
START
R/W
0
When software writes a 1 to this bit, the EMC2300 enables monitoring
and PWM output control functions based on the limit and parameter
registers. Before this bit is set, the part does not update register
values. Whenever this bit is set to 0, the monitoring and PWM output
control functions are based on the default limits and parameters,
regardless of the current values in the limit and parameter registers.
The EMC2300 preserves the values currently stored in the limit and
parameter registers when this bit is set or cleared. This bit is not
affected by setting the Lock bit.
Note:
When this bit is 0, all fans are on full 100% duty cycle, i.e.,
PWM pins are high for 255 clocks, low for 1 clock. When this
bit is 0, the part is not monitoring.
1
LOCK
R/W
0
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.
2
READY
R
0
The EMC2300 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 functioning (all bias conditions for the A/Ds have
stabilized and the A/Ds are in operational mode). (Always reads back
‘1’.)
3
OVRID
R/W
0
If this bit is set to 1, all PWM outputs go to 100% duty cycle regardless
of whether or not the lock bit is set.
4-7
Reserved
R
0
Reserved.


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