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EMC2300 Datasheet(PDF) 56 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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EMC2300 Datasheet(HTML) 56 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
56
SMSC EMC2300
DATASHEET
8.2.9
Register 42h: Interrupt Status Register 2
Note 8.10 This register is cleared on a read if no events are active.
This register is read only – a write to this register has no effect.
The Interrupt Status Register 2 bits are automatically set by the device whenever a remote temperature
sensor error occurs, or a tach reading value is above the minimum value set in the tachometer
minimum registers. The Interrupt Status Register 2 register holds a set bit until the event is read by
software or until the individual interrupt enable bit is cleared (see Note below).
The contents of this register are cleared (set to 0) automatically by the EMC2300 after it is read by
software,, if the temperature sensor error no loner exists, or if the tach reading register is no longer
above the minimum. Once set, the Interrupt Status Register 2 bits remain set until a read event occurs
or until the individual interrupt enable bit is cleared, even if the voltage, Tach, or diode event no longer
exists.
The remote diode fault bits do not clear on a read while the fault condition exists. If the start bit is set
when a fault condition occurs, 80h will be loaded into the associated temperature reading register,
which will cause the associated diode limit error bit to be set (Remote Diode 1 Limit Error or Remote
Diode 2 Limit Error) 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 (see Note below).
This register is read only – a write to this register has no effect.
Table 8.14 Interrupt Status Register 1
BIT
NAME
R/W DEFAULT
DESCRIPTION
0
Reserved
R
0
Reserved
1
Vccp_Error
R
0
The EMC2300 automatically sets this bit to 1 when the Vccp input voltage
is less than or equal to the limit set in the Vccp Low Limit register or
greater than the limit set in the Vccp High Limit register.
2
VCC_Error
R
0
The EMC2300 automatically sets this bit to 1 when the VCC input voltage
is less than or equal to the limit set in the VCC Low Limit register or
greater than the limit set in the VCC High Limit register.
3
Reserved
R
0
Reserved
4
Remote
Diode 1 Limit
Error
R
0
The EMC2300 automatically sets this bit to 1 when the temperature input
measured by the Remote1- and Remote1+ is less than or equal to the
limit set in the Remote Diode 1 Low Temp register or greater than the limit
set in Remote Diode 1 High Temp register.
5
Internal
Sensor Limit
Error
R
0
The EMC2300 automatically sets this bit to 1 when the temperature input
measured by the internal temperature sensor is less than or equal to the
limit set in the Internal Low Temp register or greater than the limit set in
the Internal High Temp register.
6
Remote
Diode 2 Limit
Error
R
0
The EMC2300 automatically sets this bit to 1 when the temperature input
measured by the Remote2- and Remote2+ is less than or equal to the
limit set in the Remote Diode 2 Low Temp register or greater than the limit
set in the Remote Diode 1 High Temp register.
7
INT2 Event
Active
R
0
The device automatically sets this bit to 1 when a status bit is set in the
Interrupt Status Register 2.
Table 8.15 Register 42h: Interrupt Status Register 2
Register
Address
Read/
Write
Register Name
Bit 7
(MSb)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSb)
Default
Value
42h
R-C
(See
Note
8.10)
Interrupt Status Register 2
ERR2
ERR1
TACH4
TACH3
TACH2
TACH1
RES
RES
00h


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