參數(shù)資料
型號(hào): LM95213CISDX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 溫度/濕度傳感器
英文描述: 2-Diode Input and Local Digital Temperature Sensor with Two-Wire Interface and TCRIT Outputs
中文描述: DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2Cel, SQUARE, SURFACE MOUNT
封裝: LLP-14
文件頁數(shù): 10/34頁
文件大?。?/td> 415K
代理商: LM95213CISDX
1.
Temperature Value Registers with signed format
Most-Significant-Byte (MSB) and Least-Significant-
Byte (LSB) Local Temperature
MSB and LSB Remote Temperature 1
MSB and LSB Remote Temperature 2
Temperature Value Registers with unsigned format
MSB and LSB Remote Temperature 1
MSB and LSB Remote Temperature 2
Diode Configuration Registers
Remote 1 Offset
Remote 2 Offset
General Configuration Registers
Configuration (Standby, Conversion Rate)
Channel Conversion Enable
Filter Setting for Remote 1 and 2
1-Shot
Status Registers
Main Status Register (Busy bit, Not Ready, Status
Register 1 to 4 Flags)
Status 1 (diode fault)
Status 2 (TCRIT1)
Status 3 (TCRIT2)
Status 4 (TCRIT3)
Mask Registers
TCRIT1 Mask
TCRIT2 Mask
TCRIT3 Mask
Limit Registers
Local Tcrit Limit
Remote 1 Tcrit-1 Limit
Remote 2 Tcrit-1 Limit
Remote 1 Tcrit-2 and Tcrit-3 Limit
Remote 2 Tcrit-2 and Tcrit-3 Limit
Common Tcrit Hysteresis
Manufacturer ID Register
Revision ID Register
2.
3.
4.
5.
6.
7.
8.
9.
1.1 CONVERSION SEQUENCE
The LM95213 takes approximately 92 ms to convert the Local
Temperature, Remote Temperatures 1 and 2, and to update
all of its registers. These conversions for each thermal diode
are addressed in a round robin sequence. Only during the
conversion process the busy bit (D7) in Status register (02h)
is high. The conversion rate may be modified by the Conver-
sion Rate bits found in the Configuration Register (03h).
When the conversion rate is modified a delay is inserted be-
tween each round of conversions, the actual time for each
round remains at 92 ms (typical all channels enabled). The
time a round takes depends on the number of channels that
are on. Different conversion rates will cause the LM95213 to
draw different amounts of average supply current as shown
in
Figure 1
. This curve assumes all the channels are on. If
channels are turned off the average current will drop since the
round robin time will decrease and the shutdown time will in-
crease during each conversion interval.
30013806
FIGURE 1. Conversion Rate Effect on Power Supply
Current
1.2 POWER-ON-DEFAULT STATES
LM95213 always powers up to these known default states.
The LM95213 remains in these states until after the first con-
version.
1.
All Temperature readings set to 0°C until the end of the
first conversion
2.
Remote offset for all channels 0°C
3.
Configuration: Active converting
4.
Continuous conversion with all channels enabled,
time = 1s
5.
Enhanced digital filter enabled for Remote 1 and 2
6.
Status Registers depends on state of thermal diode
inputs
7.
Local and Remote Temperature Limits for TCRIT1,
TCRIT2 and TCRIT3 outputs:
Output Pin
Temperature Channel Limit
Remote 2
(°C)
TCRIT1
110
Remote 1
(°C)
110
Local
(°C)
Masked,
85
85
Masked,
85
TCRIT2
TCRIT3
85
85
Masked,
85
Masked,
85
8.
9.
Manufacturers ID set to 01h
Revision ID set to 7Bh
1.3 SMBus INTERFACE
The LM95213 operates as a slave on the SMBus, so the
SMBCLK line is an input and the SMBDAT line is bidirectional.
The LM95213 never drives the SMBCLK line and it does not
support clock stretching. According to SMBus specifications,
the LM95213 has a 7-bit slave address. Three SMBus device
address can be selected by connecting A0 (pin 6) to either
Low, Mid-Supply or High voltages. The LM95213 has the fol-
lowing SMBus slave address:
www.national.com
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