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PDF PCT2075DP Data sheet ( Hoja de datos )
| Número de pieza | PCT2075DP | |
| Descripción | digital temperature sensor and thermal watchdog | |
| Fabricantes | NXP Semiconductors | |
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PCT2075
I2C-bus Fm+, 1 degree C accuracy, digital temperature sensor
and thermal watchdog
Rev. 3 — 21 May 2013
Product data sheet
1. General description
The PCT2075 is a temperature-to-digital converter featuring 1 C accuracy over 25 C
to +100 C range. It uses an on-chip band gap temperature sensor and Sigma-Delta
A-to-D conversion technique with an overtemperature detection output that is a drop-in
replacement for other LM75 series thermal sensors. The device contains a number of data
registers: Configuration register (Conf) to store the device settings such as device
operation mode, OS operation mode, OS polarity and OS fault queue; temperature
register (Temp) to store the digital temp reading, set-point registers (Tos and Thyst) to
store programmable overtemperature shutdown and hysteresis limits, and programmable
temperature sensor sampling time Tidle, that can be communicated by a controller via the
2-wire serial I2C-bus Fast-mode Plus interface.
The PCT2075 also includes an open-drain output (OS) which becomes active when the
temperature exceeds the programmed limits. The OS output operates in either of two
selectable modes: OS comparator mode or OS interrupt mode. Its active state can be
selected as either HIGH or LOW. The fault queue that defines the number of consecutive
faults in order to activate the OS output is programmable as well as the set-point limits.
The PCT2075 can be configured for different operation conditions. It can be set in normal
mode to periodically monitor the ambient temperature, or in shut-down mode to minimize
power consumption.
The temperature register always stores an 11-bit two’s complement data, giving a
temperature resolution of 0.125 C. This high temperature resolution is particularly useful
in applications of measuring precisely the thermal drift or runaway. When the device is
accessed the conversion in process is not interrupted (that is, the I2C-bus section is totally
independent of the Sigma-Delta converter section) and accessing the device continuously
without waiting at least one conversion time between communications will not prevent the
device from updating the Temp register with a new conversion result. The new conversion
result will be available immediately after the Temp register is updated. It is also possible to
read just one of the temperature register bytes without lock-up.
The PCT2075 powers up in the normal operation mode with the OS in comparator mode,
temperature threshold of 80 C and hysteresis of 75 C, so that it can be used as a
stand-alone thermostat with those pre-defined temperature set points. The default
set points can be modified during manufacture and ordered under custom part number.
There are three selectable logic address pins with three logic states so that 27 8-pin
devices or three 6-pin devices can be connected on the same bus without address
conflict.
1 page  
NXP Semiconductors
PCT2075
I2C-bus Fm+ digital temperature sensor and thermal watchdog
6.2 Pin description
Table 3.
Symbol
SDA
SCL
OS
GND
A2
A1
A0
VCC
Pin description for SO8, TSSOP8 and HWSON8
Pin Description
1 Digital I/O. I2C-bus serial bidirectional data line; open-drain.
2 Digital input. I2C-bus serial clock input.
3 Overtemp Shutdown output; open-drain.
4[1] Ground. To be connected to the system ground.
5 Digital input. User-defined address bit 2.
6 Digital input. User-defined address bit 1.
7 Digital input. User-defined address bit 0.
8 Power supply.
[1] HWSON8 package die supply ground is connected to both the GND pin and the exposed center pad. The
GND pin must be connected to supply ground for proper device operation. For enhanced thermal,
electrical, and board-level performance, the exposed pad should be soldered to the board using a
corresponding thermal pad on the board, and for proper head conduction through the board thermal vias
need to be incorporated in the PCB in the thermal pad region.
Table 4.
Symbol
A0
GND
VCC
SCL
OS
SDA
Pin description for TSOP6
Pin Description
1 Digital input. User-defined address bit 0.
2 Ground. To be connected to the system ground.
3 Power supply.
4 Digital input. I2C-bus serial clock input.
5 Overtemp Shutdown output; open-drain.
6 Digital I/O. I2C-bus serial bidirectional data line; open-drain.
PCT2075
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 21 May 2013
© NXP B.V. 2013. All rights reserved.
5 of 37
5 Page 
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. 3 — 21 May 2013
© NXP B.V. 2013. All rights reserved.
11 of 37
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