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参数资料
| 型号： | LM99 |
| 厂商： | National Semiconductor Corporation |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | 【1C Accurate, High Temperature, Remote Diode Temperature Sensor with Two-Wire Interface |
| 中文描述： | 【集成电路准确，高温，远程二极管温度传感器，两线接口 |
| 文件页数： | 7/20页 |
| 文件大小： | 349K |
| 代理商： | LM99 |
2.0 LM99 Registers (Continued)
Command Select Address
Power On Default State
Register
Name
Register Function
Read Address
<P7:P0> hex
Write Address
<P7:P0> hex
<D7:D0> binary
<D7:D0>
decimal
10h
NA
0000 0000
0
RTLB
Remote Temperature Low Byte
11h
0000 0000
0
RTOHB
Remote Temperature Offset
High Byte
12h
0000 0000
0
RTOLB
Remote Temperature Offset
Low Byte
13h
0000 0000
0
RHSLB
Remote HIGH Setpoint Low
Byte
14h
0000 0000
0
RLSLB
Remote LOW Setpoint Low
Byte
19h
0110 1110
110
RCS
Remote T_CRIT Setpoint
20h
0101 0101
85
LCS
Local T_CRIT Setpoint
21h
0000 1010
10
TH
T_CRIT Hysteresis
B0h-BEh
Manufacturers Test Registers
BFh
0000 0000
0
RDTF
Remote Diode Temperature
Filter
FEh
NA
0000 0001
1
RMID
Read Manufacturer’s ID
FFh
NA
LM99 0011 0001
LM99-1 0011 0100
49
52
RDR
Read Stepping or Die Revision
Code
2.2 LOCAL and REMOTE TEMPERATURE REGISTERS (LT, RTHB, RTLB)
(Read Only Address 00h, 01h):
BIT
D7
D6
D5
D4
D3
D2
D1
D0
Value
SIGN
64
32
16
8
4
2
1
For LT and RTHB D7–D0: Temperature Data. LSB = 1C. Two’s complement format.
(Read Only Address 10h):
BIT
D7
D6
D5
D4
D3
D2
D1
D0
Value
0.5
0.25
0.125
0000
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.
Note that the remote diode junction temperature is actually 16C higher than the Remote Temperature Register value.
2.3 STATUS REGISTER (SR)
(Read Only Address 02h):
D7
D6
D5
D4
D3
D2
D1
D0
Busy
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.
LM99
www.national.com
15
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