LM90CIMMX National Semiconductor, LM90CIMMX Datasheet - Page 14

• Manufacturer Part Number: LM90CIMMX
• Manufacturer: National Semiconductor

Specifications of LM90CIMMX

• Temperature Sensor Function: Temp Sensor
• Interface Type: Serial (2-Wire)
• Output Type: Digital
• Package Type: MSOP
• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / Rohs Status: Not Compliant

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2.0 LM90 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.
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.
2.4 CONFIGURATION REGISTER
Power up default is with all bits “0” (zero)
(Read Address 03h /Write Address 09h):
ALERT mask
Read Address
<
P7:P0
B0h-BEh
Command Select Address
D7
BFh
FEh
FFh
13h
14h
19h
20h
21h
>
(Read Only Address 02h):
hex
Busy
D7
RUN/STOP
Write Address
D6
<
P7:P0
B0h-BEh
(Read Only Address 00h, 01h):
(Read Only Address 10h):
LHIGH
BFh
13h
14h
19h
20h
21h
Value
Value
NA
NA
BIT
BIT
D6
>
hex
SIGN
D5
(Continued)
0.5
0
D7
D7
LLOW
<
D5
D7:D0
0000 0000
0000 0000
0101 0101
0101 0101
0000 1010
0000 0000
0000 0001
0010 0001
0.25
D6
D6
64
Power On Default State
>
T_CRIT_A
Remote
binary
RHIGH
mask
0.125
D4
D5
D5
D4
32
14
D4
D4
16
0
<
decimal
RLOW
D7:D0
D3
85
85
10
33
0
0
0
1
D3
0
D3
D3
8
0
>
OPEN
D2
D2
4
0
D2
T_CRIT_A
Register
RHSLB
RLSLB
Name
RDTF
Local
mask
RMID
RCS
RDR
LCS
D2
TH
D1
D1
2
0
RCRIT
D1
D0
D0
1
0
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
D1
Register Function
0
LCRIT
D0
Fault Queue
D0