EMC1402 Standard Microsystems Corp., EMC1402 Datasheet - Page 25

• Manufacturer Part Number: EMC1402
• Description: 1 Degree C Temperature Sensor With Beta Compensation
• Manufacturer: Standard Microsystems Corp.

ADDR
02h
1°C Temperature Sensor with Beta Compensation
Datasheet
SMSC EMC1402
6.1
6.2
6.3
REGISTER
ADDRESS
ADDR
00h
29h
01h
10h
FDh
R-C
FEh
FFh
R/W
REGISTER
R/W
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.
As shown in
the integer value and the low byte representing the fractional value left justified to occupy the MSBits.
The Status Register reports the operating status of the Internal Diode and External Diode 1 channels.
When any of the bits are set (excluding the BUSY bit) either the ALERT or THERM pin is being
asserted.
The ALERT and THERM pins are controlled by the respective consecutive alert counters (see
Section
Data Read Interlock
Temperature Data Registers
Status Register
R
R
R
R
Status
R/W
R
R
R
6.11) and will not be asserted until the programmed consecutive alert count has been reached.
External Diode
External Diode
Internal Diode
Internal Diode
REGISTER
High Byte
High Byte
Low Byte
Low Byte
Table
BUSY
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER NAME
B7
Product ID
6.2, all temperatures are stored as an 11-bit value with the high byte representing
SMSC ID
Revision
IHIGH
Table 6.2 Temperature Data Registers
B6
128
128
B7
0.5
0.5
Table 6.3 Status Register
ILOW
DATASHEET
B5
0.25
0.25
B6
64
64
Stores a fixed value that identifies
represents the revision number
25
Stores a fixed value that
Stores a fixed value that
0.125
0.125
EHIGH
B5
32
32
represents SMSC
B4
each product
FUNCTION
B4
16
16
-
-
ELO
B3
W
B3
8
8
-
-
FAULT
B2
B2
4
4
-
-
ETHER
B1
DEFAULT
Table 6.21
2
2
-
-
B1
M
VALUE
5Dh
01h
Revision 1.30 (05-06-08)
B0
1
1
-
-
ITHERM
B0
DEFAULT
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PAGE
00h
00h
00h
00h
DEFAULT
00h