SE95 PHILIPS [NXP Semiconductors], SE95 Datasheet - Page 11

• Manufacturer Part Number: SE95
• Description: Ultra high accuracy digital temperature sensor and thermal WatchdogE
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
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
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
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)
2. If the Temp Data MSB = 1, then: Temp Value ( C) = –(2’s complement Temp Data)
Table 6 shows some examples of the results for the 11-bit calculations.
Table 5. Temp Data and Temp Value resolution
2004 Dec 21
Bit
B7
B6–B5
B4–B3
B2
B1
B0
Data resolution
8 bits
9 bits
10 bits
11 bits
12 bits
13 bits
MSB
MSB
MSB
D10
D12
Ultra high accuracy digital temperature sensor and
thermal Watchdog
B7
Name
Reserved
Rate val
OS Fault queue
OS Polarity
OS Comp/Interrupt
Shut-down
D11
B6
D9
D10
B5
D8
for 13-bit Temp Data
for 11-bit Temp Data
Temp MS byte
B4
D7
D9
R/W
R/W
R/W
R/W
R/W
R/W
R/W
B3
D6
D8
POR
0
00
0
0
0
0
B2
D5
D7
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).
B1
D4
D6
LSB
B0
D3
D5
11
Value Resolution
Value resolution
1.0 C
0.5 C
0.25 C
0.125 C
0.0625 C
0.03125 C
MSB
B7
D2
D4
B6
D1
D3
Value Resolution
LSB
B5
D0
D2
Temp LS byte
B4
D1
X
Not used
Not used
LSB
B3
D0
X
B2
X
X
Product data sheet
B1
X
X
SE95
LSB
B0
X
X