EMC2305-1-AP-TR SMSC, EMC2305-1-AP-TR Datasheet - Page 32

• Manufacturer Part Number: EMC2305-1-AP-TR
• Description: Industrial Temperature Sensors Penta RPM-Based PWN Fan Speed Controller
• Manufacturer: SMSC

Specifications of EMC2305-1-AP-TR

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

ADDR
26h
24h
25h
27h
Revision 1.2 (03-22-10)
R/W
R-C
R-C
R-C
R-C
5.3
5.3.1
5.3.2
REGISTER
Fan Status
Fail Status
Fan Drive
Fan Spin
Fan Stall
Status
Status
Bit 1 - DR_EXT_CLK - Enables the internal tachometer clock to be driven out on the CLK pin so that
multiple devices can be synced to the same source.
Bit 0 - USE_EXT_CLK - Enables the EMC2305 to use a clock present on the CLK pin as the
tachometer clock. If the DR_EXT_CLK bit is set, then this bit is ignored and the device will use the
internal oscillator.
The Fan Status registers contain the status bits associated with each fan driver.
Fan Status - 24h
The Fan Status register indicates that one or more of the fan drivers has stalled or failed or that the
Watchdog Timer has expired (see
Bit 7 - WATCH - Indicates that the Watchdog Timer has expired. When set, each fan is driven to 100%
duty cycle and will remain at 100% duty cycle until they are programmed. This bit is cleared when it
is read.
Bit 2 - DRIVE_FAIL - Indicates that one or more fan drivers cannot meet the programmed fan speed
at maximum PWM duty cycle. This bit is set when any bit in the Fan Drive Fail Status register is set
and cleared when all bits in the Fan Drive Fail Status register are cleared.
Bit 1 - FAN_SPIN - Indicates that one or more fan drivers cannot spin up. This bit is set when any bit
in the Fan Spin Status register is set and cleared when all of the bits in the Fan Spin Status register
are cleared.
Bit 0 - FAN_STALL - Indicates that one or more fan drivers have stalled. This bit is set when any bit
in the Fan Stall Status register is set and cleared when all of the bits in the Fan Stall Status register
are cleared.
Fan Stall Status - 25h
The Fan Stall Status register indicates which fan driver has detected a stalled condition (see
Section
Fan Status Registers
‘0’ (default) - The CLK pin acts as a clock input.
‘1’ - The CLK pin acts as a clock output and is a push-pull driver.
‘0’ (default) - The EMC2305 will use its internal oscillator for all Tachometer measurements.
‘1’ - The EMC2305 will use the oscillator presented on the CLK pin for all Tachometer
measurements.
4.4.1). All bits are cleared upon a read if the error condition has been removed.
WATCH
B7
-
-
-
B6
-
-
-
-
Table 5.3 Fan Status Registers
Section
DATASHEET
B5
-
-
-
-
32
4.8).
DRIVE_
FAN5_
STALL
FAN5_
FAIL5
SPIN
B4
-
Multiple RPM-Based PWM Fan Controller for Five Fans
DRIVE_
FAN4_
STALL
FAN4_
FAIL4
SPIN
B3
-
DRIVE_
DRIVE_
STALL
FAN3_
FAN3_
FAIL3
SPIN
FAIL
B2
DRIVE_
STALL
FAN2_
FAN2_
FAN_
FAIL2
SPIN
SPIN
B1
SMSC EMC2305
DRIVE_
FAN1_
FAN1_
STALL
STALL
Datasheet
FAIL1
FAN_
SPIN
B0
DEFAULT
00h
00h
00h
00h