RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table 6.8 Conversion Rate
CONV[1:0]
1
0
CONVERSION RATE
0
0
1
1
0
1
0
1
1 / sec
2 / sec
4 / sec (default)
8 / sec
6.6
Interrupt Status Register 1
Table 6.9 Interrupt Status Register 1
B6 B5 B4 B3
RESET TSD ERR3 TRD3 ERR2
ADDRESS REGISTER
B7
B2
B1
B0
DEFAULT
22h
Interrupt
Status
TRD2 ERR1 TRD1
80h
Register 1
The Interrupt Status Registers report the operating condition of the EMC2102. If any of the bits are set
to a logic ‘1’ (other than the RESET pin) then the ALERT# pin will be asserted low. Reading from the
status register clears all status bits if the error conditions is removed. If there are no set status bits,
then the ALERT# pin will be released.
The bits that cause the ALERT# pin to be asserted can be masked based on the channel they are
associated with unless stated otherwise.
Bit 7 - RESET - this bit mirrors the output of the RESET# pin. When the RESET# pin is set to a logic
‘0’ (indicating that the VDD_5V supply is lower than the reset threshold), this bit is set to a logic ‘1’ as
well. This bit will not cause the ALERT# pin to be asserted.
Bit 6 - TSD - this bit is asserted ‘1’ if there is a thermal shutdown condition. This bit cannot be masked.
Bit 5 - ERR3 - this bit is asserted ‘1’ if there is a diode fault on External Diode 3.
Bit 4 - TRD3 - this bit is asserted ‘1’ if the External Diode 3 Temperature measurement exceeds the
high limit.
Bit 3 - ERR2 - this bit is asserted ‘1’ if there is a diode fault on External Diode 2.
Bit 2 - TRD2 - this bit is asserted ‘1’ if the External Diode 2 Temperature measurement exceeds the
high limit.
Bit 1 - ERR1 - this bit is asserted ‘1’ if there is a diode fault on External Diode 1.
Bit 0 - TRD1 - this bit is asserted ‘1’ if the External Diode 1 Temperature measurement exceeds the
high limit.
Revision 1.95 (10-19-06)
SMSC EMC2102
DATA3S6HEET
SMSC [ SMSC CORPORATION ]
