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EMC2300 Datasheet(PDF) 72 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) 72 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
Revision 0.2 (06-14-06)
72
SMSC EMC2300
DATASHEET
8.2.26
Registers 85h-88h: A/D Converter LSbs Registers
There is a 10-bit Analog to Digital Converter (ADC) located in the hardware monitoring block that
converts the measured voltages into 10-bit reading values. Depending on the averaging scheme
enabled, the hardware monitor may take multiple readings and average them to create the values
stored in the reading registers (i.e., 16x averaging, 32x averaging, etc.) The 8 MSb’s of the reading
values are placed in the Reading Registers. When the upper 8-bits located in the reading registers
are read the 4 LSb’s are latched into their respective bits in the A/D Converter LSbs Register. This
give 12-bits of resolution with a minimum value of 1/16th per unit measured. (i.e., Temperature Range:
-127.9375 ºC < Temp < 127.9375 ºC and Voltage Range: 0 < Voltage < 256.9375) . See the DC
Characteristics for the accuracy of the reading values.
The eight most significant bits of the 12-bit averaged readings are stored in Reading registers and
compared with Limit registers. The Interrupt Status Register bits are asserted if the corresponding
measured value(s) on the inputs violate their programmed limits.
8.2.27
Registers 90h-93h: TachX Option Registers
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
Table 8.51 Registers 85h-88h: A/D Converter LSbs Registers
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
85h
R
A/D Converter LSbs Reg 1
RD2.3
RD2.2
RD2.1
RD2.0
RD1.3
RD1.2
RD1.1
RD1.0
N/A
86h
R
A/D Converter LSbs Reg 2
RES
RES
RES
RES
AM.3
AM.2
AM.1
AM.0
N/A
88h
R
A/D Converter LSbs Reg 4
VCC.3
VCC.2
VCC.1
VCC.0
VCP.3
VCP.2
VCP.1
VCP.0
N/A
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
90h
R/W
Tach1 Option
RESERVED
3EDG
MODE
EDG1
EDG0
SLOW
04h
91h
R/W
Tach2 Option
RESERVED
3EDG
MODE
EDG1
EDG0
SLOW
04h
92h
R/W
Tach3 Option
RESERVED
3EDG
MODE
EDG1
EDG0
SLOW
04h
93h
R/W
Tach4 Option
RESERVED
3EDG
MODE
EDG1
EDG0
SLOW
04h


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