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參數(shù)資料
| 型號： | LM40CIMT/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | MO-153AB, TSSOP-14 |
| 文件頁數(shù)： | 15/27頁 |
| 文件大?。?/td> | 369K |
| 代理商： | LM40CIMT/NOPB |
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2.0 Register Set (Continued)
result is ready before the previous result has been read, the new results overwrites the previous result and the Error Function 2
flag (ERF2) for the Voltage-Only function in the Device Status register is set (indicating an overrun event). Reading the
Voltage-Only Measurement Readout register clears also the ERF2 flag.
Readout Resolution
The resolution of the readout register is defined in the Voltage Capabilities register. The resolution of the
LM40 is fixed and cannot be modified by software. The voltage readout format is common to all voltage sensors and is 9-bits
unsigned. For over or under input voltage conditions the data is guaranteed to saturate at all "1"s or "0"s so long as Operating
Ratings of the LM40 are adhered to.
Function Event
The Voltage-Only Measurement function generates a Function Event to the master whenever a conversion
cycle is completed and new data is stored in the Readout register. When the new data is stored into the Readout register the SF2
bit in the Device Status register is set to 1 and remains set, until it is cleared by reading the Readout register. An Attention Request
is generated on the bus, only if it is enabled by the Attention Enable bit (ATE) in the Control register.
Setup Before Enabling
No setup is required for the Voltage-Only Measurement function before it is enabled.
2.10.2 Voltage Capabilities (Addr: 010 000; 10h)
Reg
Add
Register
Name
R/
W
P
O
R
Val
Bit
15
MSb
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
LSb
010 000
Voltage
Capabilities
R 0051h
Reserved
# of Voltage Sensors
Rout
Size
9-bit Resolution
0000000001010001
This register defines the format of the voltage data in the voltage readout register. The LM40 only supports one format for all
voltage measurements as defined by the values of this register.
Bit
Type
Description
2-0
RO
Resolution. This field defines the total number of significant bits in the Voltage Readout field in the Readout
register for this function. The voltage data is always aligned to the left in the Voltage Readout filed and is
extended with zeros.
001: 9-bit (value for the LM40, for other field values see the SensorPath specification)
3RO
RoutSize (Readout Register size). Defines the total size of the Readout register.
0: 16 bits. (value for the LM40 for other field values see the SensorPath specification)
8-4
RO
# of Voltage Sensors (Number of Voltage Sensors). Specifies the number of Voltage Sensors supported
by this function.
5: The number of Voltage Sensors. (value for the LM40 for other field values see the SensorPath
specification)
15-9
RO
Reserved. Will always read "0".
2.10.3 Voltage Readout (Addr: 010 001; 11h)
Reg
Add
Register
Name
R/
W
P
O
R
Val
Bit
15
MSb
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
LSb
010 001
Voltage
Readout
R
Voltage Readout
Reserved
SNUM
Reserved
MSb
LSb
0
Bit
Type
Description
0-1
RO
Reserved. Will always read "0".
4-2
RO
SNUM (Sensor Number). This field indicates the number of the current Voltage Sensor, to which the data in
the Voltage Readout field belongs. See Table Analog Input Voltage Mapping for assignments.
6-5
RO
Reserved. Will always read "0".
15-7
RO
Voltage Readout. This field holds the result of the voltage measurement. The active size of this field for the
LM40 is 9-bits, left justified. See Table Analog Input Voltage Mapping for voltage mapping details.
LM40
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