SE95U,025 NXP Semiconductors, SE95U,025 Datasheet - Page 10

• Manufacturer Part Number: SE95U,025
• Description: IC TEMP SENSOR DGTL
• Manufacturer: NXP Semiconductors

Specifications of SE95U,025

• Function: Temp Sensor, Watchdog
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.8 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: Die
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
SE95_7
Product data sheet
When reading register Temp, all 16 bits of the two data bytes (MSByte and LSByte) must
be collected and then the two’s complement data value according to the desired resolution
must be selected for the temperature calculation.
two’s complement data value,
data value.
Table 8.
Table 9.
When converting into the temperature the proper resolution must be used as listed in
Table 10
Table 10.
Table 11
Table 11.
MSByte
MSByte
Data resolution
8 bit
9 bit
10 bit
11 bit
12 bit
13 bit
11-bit binary
(two’s complement)
011 1111 1000
011 1111 0111
011 1111 0001
011 1110 1000
000 1100 1000
000 0000 0001
000 0000 0000
111 1111 1111
111 0011 1000
110 0100 1001
110 0100 1000
D10
D12 D11 D10
1. If the Temp data MSB = 0, then: Temp ( C) = +(Temp data)
2. If the Temp data MSB = 1, then: Temp ( C) = (two’s complement Temp data)
7
7
resolution
D9
6
6
using either one of these two formulae:
shows some examples of the results for the 11-bit calculations.
Example 11-bit two’s complement Temp register
Example 13-bit two’s complement register
Temp data and Temp value resolution
Temp register value
D8
5
5
Ultra high accuracy digital temperature sensor and thermal watchdog
D7
D9
4
4
Rev. 07 — 2 September 2009
Hexadecimal value
3F8
3F7
3F1
3E8
0C8
001
000
7FF
738
649
648
D6
D8
3
3
D5
D7
2
2
Table 9
D4
D6
1
1
shows the example for 13-bit two’s complement
D3
D5
0
0
LSByte
LSByte
Value resolution
1.0 C
0.5 C
0.25 C
0.125 C
0.0625 C
0.03125 C
Decimal value
1016
1015
1009
1000
200
1
0
D2
D4
1
200
439
440
7
7
Table 8
D1
D3
6
6
D0
D2
shows the example for 11-bit
5
5
D1
X
4
4
value resolution
Value
+127.000 C
+126.875 C
+126.125 C
+125.000 C
+25.000 C
+0.125 C
0.000 C
D0
0.125 C
25.000 C
54.875 C
55.000 C
X
3
3
© NXP B.V. 2009. All rights reserved.
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