EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 29

• Manufacturer Part Number: EMC2303-1-KP-TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of EMC2303-1-KP-TR

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 12
• Lead Free Status / RoHS Status: Compliant

ADDR
24h
25h
26h
27h
Multiple RPM-Based PWM Fan Controller for Three Fans
Datasheet
SMSC EMC2303
R/W
R-C
R-C
R-C
R-C
5.3
5.3.1
REGISTER
Fan Status
Fail Status
Fan Drive
Fan Spin
Fan Stall
Status
Status
Bit 6 - DIS_TO - Disables the SMBus timeout function for the SMBus client (if enabled).
Bit 5 - WD_EN - Enables the Watchdog timer to operate in Continuous Mode (see
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 EMC2303 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.
Fan Status Registers
‘0’ - The SMBus timeout function is enabled.
‘1’ (default) - The SMBus timeout function is disabled allowing the device to be fully I
‘0’ (default) - The Watchdog timer does not operate continuously. It will function upon power up and
at no other time.
‘1’ - The Watchdog timer operates continuously as described in
‘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 EMC2303 will use its internal oscillator for all Tachometer measurements.
‘1’ - The EMC2303 will use the oscillator presented on the CLK pin for all Tachometer
measurements.
WATCH
B7
-
-
-
B6
-
-
-
-
Table 5.3 Fan Status Registers
Section
DATASHEET
B5
-
-
-
-
29
4.8).
B4
-
-
-
-
B3
-
-
-
-
DRIVE_
DRIVE_
Section
STALL
FAN3_
FAN3_
FAIL3
SPIN
FAIL
B2
4.8.
DRIVE_
STALL
FAN2_
FAN2_
FAN_
FAIL2
SPIN
SPIN
Revision 1.2 (03-22-10)
B1
Section
2
C compliant.
DRIVE_
4.8.2).
FAN1_
FAN1_
STALL
STALL
FAIL1
FAN_
SPIN
B0
DEFAULT
00h
00h
00h
00h