Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
DEFAULT
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
VALUE
PAGE
Internal Diode Data
Low Byte
Stores the fractional data for the
Internal Diode
29h
40h
FDh
FEh
FFh
R
00h
Page 27
Controls the digital filter setting for
the External Diode channel
R/W
R
Filter Control
Product ID
00h
20h
5Dh
07h
Page 37
Page 37
Page 37
Page 38
Stores a fixed value that identifies
the device
Stores a fixed value that
represents SMSC
R
Manufacturer ID
Revision
Stores a fixed value that
represents the revision number
R
6.1
Data Read Interlock
When any temperature channel high byte register is read, the corresponding low byte is copied into
an internal ‘shadow’ register. The user is free to read the low byte at any time and be guaranteed that
it will correspond to the previously read high byte. Regardless if the low byte is read or not, reading
from the same high byte register again will automatically refresh this stored low byte data.
6.2
Temperature Data Registers
Table 6.2 Temperature Data Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Internal Diode
High Byte
00h
29h
01h
10h
R
128
64
32
16
8
4
2
1
00h
Internal Diode
Low Byte
R
R
R
0.5
128
0.5
0.25
64
0.125
32
-
16
-
-
8
-
-
4
-
-
2
-
-
1
-
00h
00h
00h
External Diode
High Byte
External Diode
Low Byte
0.25
0.125
As shown in Table 6.2, all temperatures are stored as an 11-bit value with the high byte representing
the integer value and the low byte representing the fractional value left justified to occupy the MSBits.
SMSC EMC1182
27
Revision 1.0 (07-11-13)
DATASHEET
SMSC [ SMSC CORPORATION ]
