EMC1412-1-ACZL-TR Datasheet, PDF (27/47 Pages) Microchip Technology – Temperature Sensor with Beta Compensation

Multiple Channel 1°C Temperature Sensor with Beta Compensation
Datasheet
REGISTER
ADDRESS
FDh
FEh
FFh
Table 7.1 Register Set in Hexadecimal Order (continued)
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
R
Product ID
Stores a fixed value that identifies
the device
20h
Page 36
R
Manufacturer ID
Stores a fixed value that
represents SMSC
5Dh
Page 36
R
Revision
Stores a fixed value that
represents the revision number
04h
Page 37
7.1
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.
7.2
Temperature Data Registers
ADDR
00h
29h
01h
10h
Table 7.2 Temperature Data Registers
R/W
REGISTER
B7
B6
B5 B4 B3
R
Internal Diode
High Byte
128
64
32 16 8
R
Internal Diode
Low Byte
0.5
0.25 0.125
-
-
R
External Diode
High Byte
128
64
32 16 8
R
External Diode
Low Byte
0.5
0.25 0.125
-
-
B2 B1 B0 DEFAULT
4
2
1
00h
-
-
-
00h
4
2
1
00h
-
-
-
00h
7.3
As shown in Table 7.2, 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.
Status Register
Table 7.3 Status Register
ADDR R/W REGISTER
B7
B6
02h R-C
Status
BUSY IHIGH
B5
ILOW
B4
B3
B2
B1
B0
DEFAULT
EHIGH ELOW FAULT ETHERM ITHERM
00h
The Status Register reports the operating status of the Internal Diode and External Diode 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 7.11) and will not be asserted until the programmed consecutive alert count has been reached.
SMSC EMC1412
27
DATASHEET
Revision 1.41 (02-23-12)