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參數(shù)資料
| 型號： | LM84 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Diode Input Digital Temperature Sensor with Two-Wire Interface |
| 中文描述： | 二極管輸入數(shù)字溫度傳感器兩線接口 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 168K |
| 代理商： | LM84 |
Logic Electrical Characteristics
(Continued)
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions.
Note 2:
When the input voltage (V
I
) at any pin exceeds the power supplies (V
I
<
GND or V
I
>
V
CC
), the current at that pin should be limited to 5 mA. The 20 mA
maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.
Parasitics and or ESD protection circuitry are shown in the figure below for the LM84’s pins. The nominal breakdown voltage of the zener D3 is 6.5V. Care should
be taken not to forward bias the parasitic diode, D1, present on pins: NC pins 1,5 and 9, D+, ADD1 and ADD0. Doing so by more than 50 mV may corrupt a
temperature or voltage measurement.
Pin Name
NC (pins 1, 5, 9)
V
CC
D+
D
ADD0, ADD1
Note: An x indicates that the diode exists.
D1
x
D2
x
D3
x
x
x
x
x
D4
Pin Name
T_CRIT_A
SMBData
NC (pin 13)
SMBCLK
NC (pin 16)
D1
D2
x
x
x
D3
D4
x
x
x
x
x
x
x
x
x
x
Note 3:
See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National
Semiconductor Linear Data Book for other methods of soldering surface mount devices.
Note 4:
Human body model, 100 pF discharged through a 1.5 k
resistor. Machine model, 200 pF discharged directly into each pin.
Note 5:
Thermal resistance of the QSOP-16 package is TBD C/W, junction-to-ambient when attached to a printed circuit board with 2 oz. foil.
Note 6:
Typicals are at T
A
= 25C and represent most likely parametric norm.
Note 7:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8:
The Temperature Error specification does not include an additional error of
±
1C, caused by the quantization error.
Note 9:
The Temperature Error will vary less than
±
1.0C for a variation in V
CC
of 3V to 3.6V from the nominal of 3.3V.
Note 10:
Quiescent current will not increase substantially with an active SMBus.
Note 11:
This specification is provided only to indicate how often temperature data is updated. The LM84 can be read at any time without regard to conversion state
(and will yield last conversion result).
Note 12:
Default values set at power up.
Note 13:
Holding the SMBData and/or SMBCLK lines Low for a time interval greater than t
TIMEOUT
will cause the LM84 to reset SMBData and SMBCLK to the IDLE
state of an SMBus communication (SMBCLK and SMBData set High).
DS100961-8
FIGURE 1. ESD Protection Input Structure
L
www.national.com
8
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