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
7.4.1 Pointer register
The Pointer register contains an 8-bit data byte, of which the three LSB bits represent the
pointer value of the other five registers, and the other five MSB bits are equal to 0, as
shown in Table 8 and Table 9. The Pointer register is not accessible to the user, but is
used to select the data register for write/read operation by including the pointer data byte
in the bus command.
Table 8. Pointer register
B7
B6
B5
B4
B3
B[2:0]
0
0
0
0
0
pointer value
Table 9.
B2
0
0
0
0
1
Pointer value
B1
B0
0
0
0
1
1
0
1
1
0
0
Selected register
Temperature register (Temp)
Configuration register (Conf)
Hysteresis register (Thyst)
Overtemperature shutdown register (Tos)
Idle register (Tidle)
Because the Pointer value is latched into the Pointer register when the bus command
(which includes the pointer byte) is executed, a read from the device may or may not
include the pointer byte in the statement. To read again a register that has been recently
read and the pointer has been preset, the pointer byte does not have to be included. To
read a register that is different from the one that has been recently read, the pointer byte
must be included. However, a write to the device must always include the pointer byte in
the statement. The bus communication protocols are described in Section 7.10.
At power-up, the Pointer value is equal to 000b and the Temp register is selected; users
can then read the Temp data without specifying the pointer byte.
Anything not shown in Table 9 is reserved and should not be used.
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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