EMC2300-AZC SMSC, EMC2300-AZC Datasheet - Page 54

• Manufacturer Part Number: EMC2300-AZC
• Description: Industrial Temperature Sensors Auto Fan Contrllr Up to 4 Fans
• Manufacturer: SMSC

Specifications of EMC2300-AZC

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Revision 0.32 (06-23-08)
BIT
4-7
0
1
2
3
Reserved
READY
START
OVRID
NAME
LOCK
Note: There is a start-up time of up to 82ms for monitoring after the start bit is set to ‘1’, during which
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
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
e. Status bits may be set.
f.
Note: Once programmed, the register values will be saved when start bit is reset to ‘0’.
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.
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'.
Setting the START bit to 1 does not prevent the limit and parameter registers from being written.
time the reading registers are not valid.
R/W
R/W
R/W
R/W
R
R
DEFAULT
0
0
0
0
0
Table 8.12 Ready/Lock/Start Monitoring
When software writes a 1 to this bit, the
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
parameter registers when this bit is set or cleared. This bit is not
affected by setting the Lock bit.
Note:
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
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’.)
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.
Reserved.
EMC2300
DATASHEET
EMC2300
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.
54
sets this bit automatically after the part is fully powered
preserves the values currently stored in the limit and
Fan Control Device with High Frequency PWM and Temperature Monitors
DESCRIPTION
EMC2300
enables monitoring
SMSC EMC2300
Datasheet