Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications
Datasheet
Table 6.7 Temperature Limit Registers (continued)
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
08h
External
Diode Low
Limit High
Byte
00h
(0°C)
R/W
128
64
32
16
8
4
2
1
0Eh
External
Diode Low
Limit Low
Byte
14h
R/W
0.5
0.25 0.125
-
-
-
-
-
00h
The device contains both high and low limits for all temperature channels. If the measured temperature
exceeds the high limit, then the corresponding status bit is set and the ALERT / THERM2 pin is
asserted. Likewise, if the measured temperature is less than or equal to the low limit, the
corresponding status bit is set and the ALERT / THERM2 pin is asserted.
The data format for the limits must match the selected data format for the temperature so that if the
extended temperature range is used, the limits must be programmed in the extended data format.
The limit registers with multiple addresses are fully accessible at either address.
When the device is in Standby mode, updating the limit registers will have no effect until the next
conversion cycle occurs. This can be initiated via a write to the One Shot Register (see Section 6.8,
"One Shot Register 0Fh") or by clearing the RUN / STOP bit (see Section 6.4, "Configuration Register
03h / 09h").
6.7
Scratchpad Registers 11h and 12h
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 0Fh
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 effect.
SMSC EMC1182
31
Revision 1.0 (07-11-13)
DATASHEET
SMSC [ SMSC CORPORATION ]
