emc2101 Standard Microsystems Corp., emc2101 Datasheet - Page 29

• Manufacturer Part Number: emc2101
• Description: Emc2101 Fan Control With 1?c Accurate Temperature Monitoring
• Manufacturer: Standard Microsystems Corp.

SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
Chapter 6 Register Set
SMSC EMC2101
00h
01h
02h
03h and 09h
04h and 0Ah
05h and 0Bh
07h and
0Dh
08h and 0Eh
0Ch
0Fh
10h
11h
12h
13h
14h
16h
REGISTER
ADDRESS
The following registers are accessible through the SMBus Interface. The registers are described in
functional order. Registers with multiple addresses are included for software compatibility. Writing or
reading from either address will point to the same internal register.
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
Internal Temperature
External Diode Temperature
High Byte
Status
Configuration
Conversion Rate
Internal Temp Limit
External Temp High Limit
High Byte
External Temp Low Limit
High Byte
External Temperature Force
One Shot
External Diode Temperature
Low Byte
Scratchpad
Scratchpad
External Diode High Limit
Low Byte
External Diode Low Limit
Low Byte
Alert Mask
Table 6.1 Register Set in Hexadecimal Order
REGISTER NAME
DATASHEET
29
Stores the Internal
Temperature
Stores the External
Temperature High Byte
Reports internal, external,
and TCRIT alarms
Alert Mask, STANDBY,
TCRIT override, Alert Fault
Queue
Sets conversion rate
ALERT / TACH asserted if
measured temp above this
value
ALERT / TACH asserted if
measured temp above this
value
ALERT / TACH asserted if
measured temp below this
value
Force the temperature for
determining the next fan
speed used in the Fan
Control Look-Up Table
When written, performs a
one-shot conversion.
Stores the External
Temperature Low Byte
Scratchpad - This register
is read/write but does
nothing
Scratchpad - This register
is read/write but does
nothing
Fractional data of High
Limit
Fractional data of Low
Limit
Disables alarms
FUNCTION
00h
00h
00h
00h
08h
(16 / sec)
46h
(70°C)
46h
(70°C)
00h
(0°C)
00h
00h
00h
00h
00h
00h
00h
A4h
DEFAULT
VALUE
Revision 2.53 (02-19-08)
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