PCT2075DP/Q900(2013) 查看數據表（PDF） - NXP Semiconductors.
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PCT2075DP/Q900
(Rev.:2013)
(Rev.:2013)
NXP Semiconductors.
PCT2075DP/Q900 Datasheet PDF : 37 Pages
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NXP Semiconductors
PCT2075
I2C-bus Fm+ digital temperature sensor and thermal watchdog
7.4.2 Configuration register
The Configuration register (Conf) is a write/read register and contains an 8-bit
non-complement data byte that is used to configure the device for different operation
conditions. Table 10 shows the bit assignments of this register.
Table 10. Conf register
Legend: * = default value.
Bit
Symbol
Access
B[7:5] reserved
R/W
B[4:3] OS_F_QUE[1:0] R/W
B2
OS_POL
R/W
B1
OS_COMP_INT R/W
B0
SHUTDOWN R/W
Value
000*
00*
01
10
11
0*
1
0*
1
0*
1
Description
reserved for manufacturer’s use; should be kept as
zeroes for normal operation
OS fault queue programming
queue value = 1
queue value = 2
queue value = 4
queue value = 6
OS polarity selection
OS active LOW
OS active HIGH
OS operation mode selection
OS comparator
OS interrupt
device operation mode selection
normal
shutdown
7.4.3 Temperature register
The Temperature register (Temp) 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 11 bits of those two bytes are used to store
the Temp data in two’s complement format with the resolution of 0.125 C. Table 11 shows
the bit arrangement of the Temp data in the data bytes.
Table 11. Temp register
MSByte
LSByte
7654321076543210
D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X X
When reading register Temp, all 16 bits of the two data bytes (MSByte and LSByte) are
provided to the bus and should be all collected by the controller for a valid temperature
reading. However, only the 11 most significant bits should be used, and the five least
significant bits of the LSByte are zero and should be ignored. One of the ways to calculate
the Temp value in C from the 11-bit Temp data is:
1. If the Temp data MSByte bit D10 = 0, then the temperature is positive and Temp value
(C) = +(Temp data) 0.125 C.
2. If the Temp data MSByte bit D10 = 1, then the temperature is negative and
Temp value (C) = (two’s complement of Temp data) 0.125 C.
PCT2075
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 19 July 2013
© NXP B.V. 2013. All rights reserved.
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