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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，遠程二極管和本地數(shù)字溫度傳感器兩線接口 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 384K |
| 代理商： | LM90 |
Temperature-to-Digital Converter Characteristics
(Continued)
Unless otherwise noted, these specifications apply for V
=+3.0Vdc to 3.6Vdc.
Boldface limits apply for T
A
= T
J
=
T
MIN
≤
T
A
≤
T
MAX
;
all other limits T
A
= T
J
=+25C, unless otherwise noted.
Parameter
Conditions
Typical
(Note 6)
+85
Limits
(Note 7)
Units
(Limit)
C
Local and Remote T_CRIT Default
Temperature Setting
(Note 11)
Logic Electrical Characteristics
DIGITAL DC CHARACTERISTICS
Unless otherwise noted, these specifications apply for V
DD
=+3.0 to 3.6 Vdc.
Boldface limits apply for T
A
= T
J
= T
MIN
to
T
MAX
;
all other limits T
A
= T
J
=+25C, unless otherwise noted.
Symbol
Parameter
Conditions
Typical
(Note 6)
Limits
(Note 7)
Units
(Limit)
SMBData, SMBCLK INPUTS
V
IN(1)
V
IN(0)
V
IN(HYST)
Logical “1” Input Voltage
Logical “0”Input Voltage
SMBData and SMBCLK Digital
Input Hysteresis
Logical “1” Input Current
Logical “0” Input Current
Input Capacitance
2.1
0.8
V (min)
V (max)
mV
400
I
IN(1)
I
IN(0)
C
IN
ALL DIGITAL OUTPUTS
I
OH
V
OL
V
IN
= V
DD
V
IN
= 0 V
0.005
0.005
5
±
10
±
10
μA (max)
μA (max)
pF
High Level Output Current
SMBus Low Level Output Voltage
V
OH
= V
DD
I
OL
= 4mA
I
OL
= 6mA
10
0.4
0.6
μA (max)
V (max)
SMBus DIGITAL SWITCHING CHARACTERISTICS
Unless otherwise noted, these specifications apply for V
DD
=+3.0 Vdc to +3.6 Vdc, C
(load capacitance) on output lines = 80
pF.
Boldface limits apply for T
= T
= T
to T
;
= T
= +25C, unless otherwise noted.
The switching characteristics of the LM90 fully meet or exceed the published specifications of the SMBus version 2.0. The fol-
lowing parameters are the timing relationships between SMBCLK and SMBData signals related to the LM90. They adhere to
but are not necessarily the SMBus bus specifications.
Symbol
Parameter
Conditions
Typical
(Note 6)
Limits
(Note 7)
100
10
4.7
25
4.0
Units
(Limit)
kHz (max)
kHz (min)
μs (min)
ms (max)
μs (min)
μs (max)
μs (max)
ns (max)
f
SMB
SMBus Clock Frequency
t
LOW
SMBus Clock Low Time
from V
IN(0)
max to
V
IN(0)
max
from V
IN(1)
min to V
IN(1)
min
(Note 12)
(Note 13)
C
L
= 400pF,
I
O
= 3mA, (Note 13)
t
HIGH
t
R,SMB
t
F,SMB
t
OF
SMBus Clock High Time
SMBus Rise Time
SMBus Fall Time
Output Fall Time
1
0.3
250
t
TIMEOUT
SMBData and SMBCLK Time Low for
Reset of Serial Interface (Note 14)
Data In Setup Time to SMBCLK High
Data Out Stable after SMBCLK Low
25
35
250
300
900
100
ms (min)
ms (max)
ns (min)
ns (min)
ns (max)
ns (min)
t
SU;DAT
t
HD;DAT
t
HD;STA
Start Condition SMBData Low to SMBCLK
Low (Start condition hold before the first
clock falling edge)
Stop Condition SMBCLK High to SMBData
Low (Stop Condition Setup)
t
SU;STO
100
ns (min)
L
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5
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