EMC1403 Datasheet, PDF (30/55 Pages) SMSC Corporation – 1°C Temperature Sensor with Beta Compensation

REGISTER
ADDRESS
37h
40h
FDh
FEh
FFh
1°C Temperature Sensor with Beta Compensation
Data Sheet
Table 6.1 Register Set in Hexadecimal Order (continued)
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
R
THERM Limit Status Status bits for the THERM Limits
00h
Page 42
R/W
Filter Control
Controls the digital filter setting for
the External Diode 1 channel
00h
Page 42
R
Product ID
Stores a fixed value that identifies
each product
Table 6.25
Page 43
R
Microchip ID
Stores a fixed value that
represents Microchip
5Dh
Page 43
R
Revision
Stores a fixed value that
represents the revision number
01h or 04h Page 44
6.1
6.2
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.
Temperature Data Registers
ADDR
00h
29h
01h
10h
23h
24h
2Ah
2Bh
Table 6.2 Temperature Data Registers
R/W
REGISTER
B7
B6
B5 B4 B3 B2 B1 B0 DEFAULT
R
Internal Diode
High Byte
128
64
32 16 8
4
2
1
00h
R
Internal Diode
Low Byte
0.5
0.25 0.125
-
-
-
-
-
00h
R
External Diode
1 High Byte
128
64
32 16 8
4
2
1
00h
R
External Diode
1 Low Byte
0.5
0.25 0.125
-
-
-
-
-
00h
R
External Diode
2 High Byte
128
64
32 16 8
4
2
1
00h
R
External Diode
2 Low Byte
0.5
0.25 0.125
-
-
-
-
-
00h
R
External Diode
3 High Byte
128
64
32 16 8
4
2
1
00h
R
External Diode
3 Low Byte
0.5
0.25 0.125
-
-
-
-
-
00h
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.
DS20005272A-page 30
 2014 Microchip Technology Inc.