LM99-1CIMMX National Semiconductor, LM99-1CIMMX Datasheet - Page 17

• Manufacturer Part Number: LM99-1CIMMX
• Description: 1C Accurate / High Temperature / Remote Diode Temperature Sensor with Two-Wire Interface
• Manufacturer: National Semiconductor

2.0 LM99 Registers
2.8 REMOTE TEMPERATURE OFFSET REGISTERS (RTOHB and RTOLB)
For RTOHB: Remote Temperature Offset High Byte. Power-on default is LHIGH = RHIGH = 0˚C. 1 LSB = 1˚C. Two’s complement
format.
For RTOLB: Remote Temperature Offset High Byte. Power-on default is 0˚C. 1 LSB = 0.125˚C. Two’s complement format.
The offset value written to these registers will automatically be added to or subtracted from the remote temperature measurement
that will be reported in the Remote Temperature registers.
2.9 LOCAL and REMOTE T_CRIT REGISTERS (RCS and LCS)
D7–D0: T_CRIT setpoint temperature data. Local power-on default is T_CRIT = 85˚C. Remote power-on default is T_CRIT =
110˚C (+126˚C actual remote diode temperature). 1 LSB = 1˚C, two’s complement format.
2.10 T_CRIT HYSTERESIS REGISTER (TH)
D7–D0: T_CRIT Hysteresis temperature. Power-on default is TH = 10˚C. 1 LSB = 1˚C, maximum value = 31.
2.11 FILTER and ALERT CONFIGURE REGISTER
D7-D3: is not defined defaults to "0".
D2-D1: input filter setting as defined the table below:
Level 2 sets maximum filtering.
D0: when set to "1" comparator mode is enabled.
2.12 MANUFACTURERS ID REGISTER
(Read Address FEh) Default value 01h.
2.13 DIE REVISION CODE REGISTER
(Read Address FFh) The LM99 version has a default value 31h or 49 decimal. The LM99-1 version has a default value of 34h or
52 decimal. This register will increment by 1 every time there is a revision to the die by National Semiconductor.
(Read and Write Address BFh):
Value
BIT
D7
0
(Read / Write Address 11h):
(Read / Write Address 12h):
(Read / Write Address 20h, 19h):
(Read and Write Address 21h):
Value
Value
Value
Value
BIT
BIT
BIT
BIT
D6
0
(Continued)
SIGN
SIGN
0.5
D7
D7
D7
D7
D5
0
D2
0.25
0
0
1
1
D6
D6
D6
D6
64
64
0.125
D5
D5
D5
D5
32
32
D4
0
D1
0
1
0
1
17
D4
D4
D4
D4
16
16
16
0
D3
0
D3
D3
D3
D3
8
0
8
8
Filter Level
No Filter
Level 1
Level 1
Level 2
D2
D2
D2
D2
4
0
4
4
D2
Filter Level
D1
D1
D1
D1
2
0
2
2
D1
D0
D0
D0
D0
1
0
1
1
Configure
ALERT
D0
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