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LM95235 Datasheet(PDF) 15 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM95235
Description  Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM95235 Datasheet(HTML) 15 Page - National Semiconductor (TI)

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2.0 LM95235 Registers
Command register selects which registers will be read from or written to. Data for this register should be transmitted during the
Command Byte of the SMBus write communication. POR means Power-On Reset.
P0-P7: Command
P7
P6
P5
P4
P3
P2
P1
P0
Command
Register Summary
Register Name
Read
Address
(Hex)
Write
Address
(Hex)
No.
of
bits
POR
Default
(Hex)
Read/
Write
Description
TEMPERATURE SIGNED VALUE REGISTERS
Local Temp MSB
0x00
NA
8
RO
Supports SMBus byte
Local Temp LSB
0x30
NA
3
RO
All unused bits are reported as "0".
Remote Temp MSB –
Signed
0x01
NA
8
RO
Supports SMBus byte
Remote Temp LSB –
Signed
0x10
NA
5/3
RO
All unused bits are reported as "0".
TEMPERATURE UNSIGNED VALUE REGISTERS
Remote Temp MSB –
Unsigned
0x31
NA
8
RO
Supports SMBus byte reads
Remote Temp LSB –
Unsigned
0x32
NA
5/3
RO
All unused bits are reported as "0".
DIODE CONFIGURATION REGISTERS
Configuration Register 2
0xBF
0xBF
5
0x1F
R/W
Filter Enable, Diode Model Select, Diode
Fault Mask; Pin 6 OS/A0 function select
Remote Offset
High Byte
0x11
0x11
8
0x00
R/W
2’s Complement
Remote Offset
Low Byte
0x12
0x12
3
0x00
R/W
2’s Complement
All unused bits are reported as "0".
GENERAL CONFIGURATION REGISTERS
Configuration Register 1
0x03/
0x09
0x09/
0x03
5
0x00
R/W
STOP/RUN , Remote TCRIT mask,
Remote OS mask, Local TCRIT mask,
Local OS mask
Conversion Rate
0x04/0x0A 0x04/0x0A
2
0x02
R/W
Continuous or specific settings
One-Shot
NA
0x0F
WO
A write to this register activates one
conversion if STOP/RUN bit = 1.
STATUS REGISTERS
Status Register 1
0x02
NA
5
RO
Busy bit, and status bits
Status Register 2
0x33
NA
2
RO
Not Ready bit, Diode detect bit
LIMIT REGISTERS
Remote OS Limit
0x07/
0x0D
0x0D/
0x07
8
0x55
R/W
Unsigned 0 to 255 ˚C
Default 85 ˚C
Local Shared OS and
T_Crit Limit
0x20
0x20
7
0x55
R/W
Unsigned 0 to 127 ˚C
Default 85 ˚C
Remote T_Crit Limit
0x19
0x19
8
0x6E
R/W
Unsigned 0 to 255 ˚C
Default 110 ˚C
Common Hysteresis
0x21
0x21
5
0x0A
R/W
up to 31˚C
IDENTIFICATION REGISTERS
Manufacturer ID
0xFE
0x01
RO
Always returns 0x01
Revision ID
0xFF
0xB1
RO
Returns revision number.
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