EMC6D102-CZC SMSC, EMC6D102-CZC Datasheet - Page 53

• Manufacturer Part Number: EMC6D102-CZC
• Description: Industrial Temperature Sensors Auto Fan Contrllr Up to 4 Fans
• Manufacturer: SMSC

Specifications of EMC6D102-CZC

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

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features
Datasheet
SMSC EMC6D102
7.2.9
Register
Address
BIT
4-7
0
1
2
3
40h
Reserved
READY
START
OVRID
NAME
LOCK
Read/
Write
R/W
Further, application software may use the current stepping to implement work-arounds for bugs found
in a specific silicon stepping. This register is read only – a write to this register has no effect.
Register 40h: Ready/Lock/Start Monitoring
Setting the Lock bit makes the Lock and Start bits read-only.
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'
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.
time the reading registers are not valid.
R/W
R/W
R/W
R/W
Ready/Lock/Start
R
R
Register Name
DEFAULT
0
0
0
0
0
When software writes a 1 to this bit, the EMC6D102 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 EMC6D102 preserves the values currently stored in the limit and
parameter registers when this bit is set or cleared. This bit becomes
read only when the Lock bit is set.
Note:
It is expected that all limit and parameter registers will be set by BIOS
or application software prior to setting this bit because these registers
cannot be written once the start bit is set.
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 EMC6D102 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’.)
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.
(MSb)
Bit 7
RES
DATASHEET
Bit 6
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.
RES
53
Bit 5
RES
Bit 4
RES
DESCRIPTION
OVRID
Bit 3
READY
Bit 2
LOCK
Bit 1
Revision 0.4 (09-25-07)
START
(LSb)
Bit 0
Default
Value
00h