參數(shù)資料
型號(hào)： SE95
廠商： NXP Semiconductors N.V.
元件分類： 溫度/濕度傳感器
英文描述： Ultra high accuracy digital temperature sensor and thermal WatchdogE
中文描述： 超高精度數(shù)字溫度傳感器和熱WatchdogE
文件頁(yè)數(shù)： 11/20頁(yè)
文件大?。?/td> 198K
代理商： SE95
Philips Semiconductors
Product data sheet
SE95
Ultra high accuracy digital temperature sensor and
thermal Watchdog
2004 Dec 21
11
Configuration register
The Configuration register is a write/read register and contains an 8-bit non-complement data byte that is used to configure the device for
different operating conditions. The Configuration register table (Table 3) shows the bit assignments of this register.
Table 3. Configuration register table
Bit
Name
B7
Reserved
B6–B5
Rate val
R/W
R/W
R/W
POR
0
00
Description
Reserved for manufacturer’s use.
Sets the conversion rate:
00 = 10 conversions/sec (default)
01 = 0.125 conversions/sec
10 = 1 conversions/sec
11 = 30 conversions/sec
For OS Fault Queue programming.
Programmable queue data = 0, 1 ,2, 3 for queue value = 1, 2, 4, 6 respectively. Default = 0.
For OS Polarity selection.
1 = OS active HIGH, 0 = OS active LOW (default).
For OS operation Mode selection.
1 = OS interrupt, 0 = OS comparator (default).
For Device Operation Mode selection.
1 = Shut-down, 0 = Normal (default).
B4–B3
OS Fault queue
R/W
0
B2
OS Polarity
R/W
0
B1
OS Comp/Interrupt
R/W
0
B0
Shut-down
R/W
0
Temperature Register (Temp)
The Temp register holds the digital result of temperature measurement or monitor at the end each A-to-D conversion. This register is read only
and contains two 8-bit data bytes consisting of one most significant (MS) data byte and one least significant (LS) data byte. However, only 13
bits of those two bytes are used to store the Temp data in 2’s complement format with the resolution of 0.03125
°
C. The Temp register table
(Table 4) shows the bit arrangement of the Temp data in the data bytes.
Table 4. Temp Register table
Temp MS byte
Temp LS byte
MSB
B7
LSB
B0
MSB
B7
LSB
B0
B6
B5
B4
B3
B2
B1
B6
B5
B4
Not used
B3
B2
B1
for 11-bit Temp Data
MSB
D10
LSB
D0
D9
D8
D7
D6
D5
D4
D3
D2
D1
X
Not used
X
X
X
X
for 13-bit Temp Data
MSB
D12
LSB
D0
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
X
X
X
When reading the Temp register, all 16 bits of the two data bytes (MS byte and LS byte) must be collected and then the 2’s complement data
value according to the desired resolution must be selected for the temperature calculation. The Table 4 has shown the examples for two cases:
11-bit 2’s complement data value, and 13-bit 2’s complement data value. When converting into the temperature the proper resolution must be
used as listed in Table 5 using either one of these two formulae:
1. If the Temp Data MSB = 0, then:
Temp Value (
°
C) = +(Temp Data)
×
Value Resolution
Temp Value (
°
C) = –(2’s complement Temp Data)
×
Value Resolution
2. If the Temp Data MSB = 1, then:
Table 6 shows some examples of the results for the 11-bit calculations.
Table 5. Temp Data and Temp Value resolution
Data resolution
8 bits
9 bits
10 bits
11 bits
12 bits
13 bits
Value resolution
1.0
°
C
0.5
°
C
0.25
°
C
0.125
°
C
0.0625
°
C
0.03125
°
C
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