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參數(shù)資料
| 型號： | LM90 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 3 Degree Celcious Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface |
| 中文描述： | 3度Celcious精確，遠(yuǎn)程二極管和本地數(shù)字溫度傳感器兩線接口 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 384K |
| 代理商： | LM90 |
2.0 LM90 REGISTERS
(Continued)
Command Select Address
Read Address
<
P7:P0
>
hex
13h
Power On Default State
<
D7:D0
>
binary
Register
Name
Register Function
Write Address
<
P7:P0
>
hex
13h
<
D7:D0
>
decimal
0
0000 0000
RHSLB
Remote HIGH Setpoint Low
Byte
Remote LOW Setpoint Low
Byte
Remote T_CRIT Setpoint
T_CRIT Hysteresis
Manufacturers Test Registers
Remote Diode Temperature
Filter
Read Manufacturer’s ID
Read Stepping or Die Revision
Code
14h
14h
0000 0000
0
RLSLB
19h
20h
21h
19h
20h
21h
0101 0101
0101 0101
0000 1010
85
85
10
RCS
LCS
TH
B0h-BEh
BFh
B0h-BEh
BFh
0000 0000
0
RDTF
FEh
FFh
NA
NA
0000 0001
0010 0001
1
33
RMID
RDR
2.2 LOCAL and REMOTE TEMPERATURE REGISTERS (LT, RTHB, RTLB)
(Read Only Address 00h, 01h):
BIT
Value
D7
SIGN
D6
64
D5
32
D4
16
D3
8
D2
4
D1
2
D0
1
For LT and RTHB D7–D0: Temperature Data. LSB = 1C. Two’s complement format.
(Read Only Address 10h):
BIT
Value
D7
0.5
D6
0.25
D5
0.125
D4
0
D3
0
D2
0
D1
0
D0
0
For RTLB D7–D5: Temperature Data. LSB = 0.125C. 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)
(Read Only Address 02h):
D7
Busy
D6
D5
D4
D3
D2
D1
D0
LHIGH
LLOW
RHIGH
RLOW
OPEN
RCRIT
LCRIT
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
(Read Address 03h /Write Address 09h):
D7
D6
D5
0
D4
D3
0
D2
Local
T_CRIT_A
mask
D1
0
D0
ALERT mask
RUN/STOP
Remote
T_CRIT_A
mask
Fault Queue
Power up default is with all bits “0” (zero)
L
www.national.com
14
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