LM99-1CIMMX/NOPB National Semiconductor, LM99-1CIMMX/NOPB Datasheet - Page 15

• Manufacturer Part Number: LM99-1CIMMX/NOPB
• Description: IC REM DIODE TEMP SENSOR 8-MSOP
• Manufacturer: National Semiconductor

Specifications of LM99-1CIMMX/NOPB

• Function: Hardware Monitor
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• For Use With: LM99-1EVAL/NOPB - BOARD EVALUATION LM99-1LM99-1EVAL - BOARD EVALUATION LM99-1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM99-1CIMMX

2.0 LM99 Registers
2.2 LOCAL and REMOTE TEMPERATURE REGISTERS (LT, RTHB, RTLB)
For LT and RTHB D7–D0: Temperature Data. LSB = 1˚C. Two’s complement format.
For RTLB D7–D5: Temperature Data. LSB = 0.125˚C. Two’s complement format.
The maximum value available from the Local Temperature register is 127; the minimum value available from the Local
Temperature register is -128. The maximum value available from the Remote Temperature register is 127.875; the minimum value
available from the Remote Temperature registers is −128.875.
Note that the remote diode junction temperature is actually 16˚C higher than the Remote Temperature Register value.
2.3 STATUS REGISTER (SR)
Power up default is with all bits “0” (zero).
D0: LCRIT: When set to “1” indicates a Local Critical Temperature alarm.
D1: RCRIT: When set to “1” indicates a Remote Diode Critical Temperature alarm.
D2: OPEN: When set to “1” indicates a Remote Diode disconnect.
D3: RLOW: When set to “1” indicates a Remote Diode LOW Temperature alarm
D4: RHIGH: When set to “1” indicates a Remote Diode HIGH Temperature alarm.
D5: LLOW: When set to “1” indicates a Local LOW Temperature alarm.
D6: LHIGH: When set to “1” indicates a Local HIGH Temperature alarm.
D7: Busy: When set to “1” ADC is busy converting.
Read Address
<
P7:P0
Command Select Address
B0h-BEh
BFh
FEh
10h
12h
13h
14h
19h
20h
21h
FFh
11h
(Read Only Address 02h):
>
hex
Busy
D7
Write Address
<
P7:P0
(Read Only Address 00h, 01h):
(Read Only Address 10h):
B0h-BEh
LHIGH
Value
Value
BFh
11h
12h
13h
14h
19h
20h
21h
BIT
BIT
NA
NA
NA
D6
>
(Continued)
hex
SIGN
0.5
D7
D7
LLOW
D5
<
LM99-1 0011 0100
D7:D0
Power On Default State
0.25
LM99 0011 0001
D6
D6
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0101 0101
0000 1010
0000 0000
0000 0001
64
0110 1110
>
RHIGH
0.125
binary
D5
D5
D4
32
15
D4
D4
16
0
<
RLOW
decimal
D7:D0
D3
110
85
10
49
52
0
0
0
0
0
0
1
D3
D3
8
0
>
OPEN
D2
D2
Register
RTOHB
RHSLB
4
0
RTOLB
RLSLB
Name
RDTF
D2
RTLB
RMID
RCS
RDR
LCS
TH
D1
D1
2
0
Remote Temperature Low Byte
Remote Temperature Offset
High Byte
Remote Temperature Offset
Low Byte
Remote HIGH Setpoint Low
Byte
Remote LOW Setpoint Low
Byte
Remote T_CRIT Setpoint
Local T_CRIT Setpoint
T_CRIT Hysteresis
Manufacturers Test Registers
Remote Diode Temperature
Filter
Read Manufacturer’s ID
Read Stepping or Die Revision
Code
RCRIT
D1
D0
D0
1
0
Register Function
LCRIT
D0
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