SE95_7

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 07 — 2 September 2009

9 of 27

NXP Semiconductors

SE95

Ultra high accuracy digital temperature sensor and thermal watchdog

At power-up, the pointer value is preset to logic 0 for register Temp; users can then read

the temperature without specifying the pointer byte.

8.4 Configuration register

The Configuration (Conf) register is a read/write register and contains an 8-bit

non-complement data byte that is used to configure the device for different operating

conditions. Table 6 shows the bit assignments of this register.

8.5 Temperature register

The Temperature (Temp) register holds the digital result of temperature measurement or

monitor at the end of each analog to digital conversion. This register is read only and

contains two 8-bit data bytes consisting of one Most Significant Byte (MSByte) and one

Least Significant Byte (LSByte). However, only 13 bits of those two bytes are used to store

the Temp data in two’s complement format with the resolution of 0.03125

°C. Table 7

shows the bit arrangement of the Temp data in the data bytes.

Table 6.

Conf register

Legend: * = default value.

Bit

Symbol

Access

Value

Description

7

reserved

R/W

0*

reserved for manufacturer’s use

6 and 5

RATEVAL[1:0]

R/W

sets the conversion rate

00*

10 conversion/s

01

0.125 conversion/s

10

1 conversion/s

11

30 conversion/s

4 and 3

OS_F_QUE[1:0]

R/W

OS fault queue programming

00*

queue value = 1

01

queue value = 2

10

queue value = 4

11

queue value = 6

2

OS_POL

R/W

OS polarity selection

0*

OS active LOW

1

OS active HIGH

1

OS_COMP_INT

R/W

OS operation mode selection

0*

OS comparator

1

OS interrupt

0

SHUTDOWN

R/W

0

operation mode

0*

normal

1

shutdown

Table 7.

Temp register

MSByte

LSByte

7654321076543210

D15 D14 D13 D12 D11 D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0