EMC1404 SMSC Corporation, EMC1404 Datasheet - Page 33

• Manufacturer Part Number: EMC1404
• Description: (EMC1403 / EMC1404) Temperature Sensor
• Manufacturer: SMSC Corporation

1°C Temperature Sensor with Beta Compensation
Datasheet
SMSC EMC1403/EMC1404
6.7
6.8
6.9
ADDR.
ADDR.
ADDR
0Fh
1Ah
19h
20h
21h
30h
11h
12h
Scratchpad Registers
One Shot Register
Therm Limit Registers
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The Scratchpad Registers are Read Write registers that are used for place holders to be software
compatible with legacy programs. Reading from the registers will return what is written to them.
The One Shot Register is used to initiate a one shot command. Writing to the one shot register, when
the device is in standby mode and BUSY bit (in Status Register) is ‘0’, will immediately cause the ADC
to update all temperature measurements. Writing to the One Shot Register while the device is in active
mode will have no affect.
The THERM Limit Registers are used to determine whether a critical thermal event has occurred. If
the measured temperature exceeds the THERM Limit, then the THERM pin is asserted. The limit
setting must match the chosen data format of the temperature reading registers.
W
R/W
R/W
R/W
REGISTER
Internal Diode
THERM Limit
THERM Limit
THERM Limit
THERM Limit
One Shot
REGISTER
Hysteresis
External
External
External
Diode 1
Diode 2
THERM
Diode 3
REGISTER
Scratchpad
Scratchpad
Writing to this register initiates a single conversion cycle. Data
B7
Table 6.10 Therm Limit Registers
128
128
128
128
128
B7
Table 6.8 Scratchpad Register
Table 6.9 One Shot Register
B7
B6
7
7
DATASHEET
B6
64
64
64
64
64
is not stored and always reads 00h
B6
B5
6
6
33
B5
32
32
32
32
32
B4
B5
5
5
B4
16
16
16
16
16
B4
B3
4
4
B3
8
8
8
8
8
B3
3
3
B2
B2
B2
4
4
4
4
4
2
2
B1
B1
B1
2
2
2
2
2
1
1
Revision 1.16 (03-15-07)
B0
B0
B0
1
1
1
1
1
0
0
DEFAULT
DEFAULT
DEFAULT
(85°C)
(85°C)
(85°C)
(10°C)
(85°C)
00h
0Ah
00h
00h
55h
55h
55h
55h