1°C Temperature Sensor with Beta Compensation
Datasheet
6.7
Scratchpad Registers
Table 6.8 Scratchpad Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
11h
12h
R/W
R/W
Scratchpad
Scratchpad
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0
0
00h
00h
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.
6.8
One Shot Register
Table 6.9 One Shot Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Writing to this register initiates a single conversion cycle. Data
is not stored and always reads 00h
0Fh
W
One Shot
00h
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.
6.9
Therm Limit Registers
Table 6.10 Therm Limit Registers
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
External
Diode THERM
Limit
55h
(85°C)
19h
R/W
128
64
32
16
8
4
2
1
Internal Diode
THERM Limit
55h
(85°C)
20h
21h
R/W
R/W
128
128
64
64
32
32
16
16
8
8
4
4
2
2
1
1
THERM
Hysteresis
0Ah
(10°C)
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.
Unlike the ALERT pin, the THERM pin cannot be masked. Additionally, the THERM pin will be released
once the temperature drops below the corresponding threshold minus the THERM Hysteresis.
Revision 1.16 (03-15-07)
SMSC EMC1402
DATA3S0HEET
SMSC [ SMSC CORPORATION ]
