Environmental Monitoring and Control Device
Datasheet
BIT
7
NAME
R/W
R
DEFAULT
DESCRIPTION
INT2, 3 Event
0
The EMC6D100/EMC6D101 automatically sets this bit to 1 when
Active
a status bit is set in either Interrupt Status Register 2 or 3.
8.12 Register 42h: Interrupt Status Register 2
BIT 7
(MSB)
BIT 0
(LSB)
REGISTER
ADDRESS
READ/
WRITE
REGISTER
NAME
DEFAULT
VALUE
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
Interrupt
Status
R-C1
00h
ERR2
ERR1 FAN4 FAN3 FAN2 FAN1
RES
12V
42h
Register 2
Note 1: This register is cleared on a read if no events are active
The Interrupt Status Register 2 bits is automatically set by the EMC6D100/EMC6D101 whenever a remote
temperature sensor error occurs, a fan is above the minimum speed set in the tachometer minimum
registers, or whenever the 12V input voltage violates the limits set in the limit and parameter registers.
The Interrupt Status Register 2 register holds a set bit until the event is read by software.
The contents of this register are cleared (set to 0) automatically by the EMC6D100/EMC6D101 after it is
read by software, if the voltage or temperature no longer violates the limits set in the limit and parameter
registers, or if the fan reading register is no longer above the minimum. Once set, the Interrupt Status
Register 2 bits remain set until a read event occurs, even if the voltage or temperature no longer violates
the limits set in the limit and parameter registers or if the fan reading register is below the minimum.
The remote diode fault bits do not clear on a read while the fault condition exists. A fault event loads 80h
into the associated temperature reading register when the start bit is set, which will cause the associated
diode limit error bit to be set (Zone 1 Limit Exceeded or Zone 3 Limit Exceeded) in addition to the diode
fault bit. Disabling the enable bit for the diode will clear both the fault bit and the error bit for that diode.
This register is read only – a write to this register has no effect.
BIT
0
NAME
+12v_Error
R/W
R
DEFAULT
DESCRIPTION
0
The EMC6D100/EMC6D101 automatically sets this bit to 1
when the 12V input voltage is less than or equal to the limit set
in the 12V Low Limit register or greater than the limit set in the
12V High Limit register.
1
2
Reserved
Fan1 Stalled
R
R
0
0
Reserved
The EMC6D100/EMC6D101 automatically sets this bit to 1
when the TACH1 input reading is above the value set in the
Tach1 Minimum MSB and LSB registers.
3
4
5
6
7
Fan2 Stalled
Fan3 Stalled
Fan4 Stalled
R
R
R
R
R
0
0
0
0
0
The EMC6D100/EMC6D101 automatically sets this bit to 1
when the TACH2 input reading is above the value set in the
Tach2 Minimum MSB and LSB registers.
The EMC6D100/EMC6D101 automatically sets this bit to 1
when the TACH3 input reading is above the value set in the
Tach3 Minimum MSB and LSB registers.
The EMC6D100/EMC6D101 automatically sets this bit to 1
when the TACH4 input reading is above the value set in the
Tach4 Minimum MSB and LSB registers.
The EMC6D100/EMC6D101 automatically sets this bit to 1
when there is either a short or open circuit fault on the
Remote1+ or Remote1- thermal diode input pins.
Remote Diode
1 Fault
Remote Diode
2 Fault
The EMC6D100/EMC6D101 automatically sets this bit to 1
when there is either a short or open circuit fault on the
Remote2+ or Remote2- thermal diode input pins.
SMSC EMC6D100/EMC6D101
Page 47
Rev. 09-09-04
DATASHEET
SMSC [ SMSC CORPORATION ]
