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PCT2075TP PDF 데이터시트 ( Data , Function )

부품번호 PCT2075TP 기능
기능 digital temperature sensor and thermal watchdog
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PCT2075TP 데이터시트, 핀배열, 회로
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.




PCT2075TP pdf, 반도체, 판매, 대치품
NXP Semiconductors
5. Block diagram
PCT2075
I2C-bus Fm+ digital temperature sensor and thermal watchdog
PCT2075
BIAS
REFERENCE
BAND GAP
TEMP SENSOR
OSCILLATOR
POWER-ON
RESET
VCC
11-BIT
SIGMA-DELTA
A-to-D
CONVERTER
POINTER
REGISTER
COUNTER
TIDLE/TIMER
COMPARATOR/
INTERRUPT
CONFIGURATION
REGISTER
TEMPERATURE
REGISTER
TOS
REGISTER
THYST
REGISTER
OS
LOGIC CONTROL AND INTERFACE
A2 A1 A0
SCL SDA
Fig 1. Block diagram of PCT2075
6. Pinning information
GND
002aag634
6.1 Pinning
PCT2075
Product data sheet
SDA 1
SCL 2
OS 3
GND 4
8 VCC
7 A0
PCT2075D
6 A1
5 A2
002aag635
Fig 2. Pin configuration for SO8
terminal 1
index area
SDA 1
SCL 2
OS 3
GND 4
PCT2075TP
8 VCC
7 A0
6 A1
5 A2
002aag637
Transparent top view
Fig 4. Pin configuration for HWSON8
SDA 1
8 VCC
SCL 2
PCT2075DP
7 A0
OS 3 PCT2075DP/Q900 6 A1
GND 4
5 A2
002aag636
Fig 3. Pin configuration for TSSOP8
A0 1
6 SDA
GND 2 PCT2075GV 5 OS
VCC 3
4 SCL
002aag638
Fig 5. Pin configuration for TSOP6
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 21 May 2013
© NXP B.V. 2013. All rights reserved.
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PCT2075TP 전자부품, 판매, 대치품
NXP Semiconductors
PCT2075
I2C-bus Fm+ digital temperature sensor and thermal watchdog
In both cases, comparator mode and interrupt mode, the OS output is activated only if a
number of consecutive faults, defined by the device fault queue, has been met. The fault
queue is programmable and stored in the two bits, B3 and B4, of the Configuration
register. Also, the OS output active state is selectable as HIGH or LOW by setting
accordingly the configuration register bit B2.
At power-up, the PCT2075 is put into normal operation mode in OS comparator mode, the
Tots is set to 80 C, the Thys is set to 75 C, the OS active state is selected LOW and the
fault queue is equal to 1. The temp reading data is 0 C and not updated until the first
conversion is completed in about 28 ms. The default Tots and Thys is set at the factory and
can be modified on custom part number.
The OS response to the temperature is illustrated in Figure 6.
Tots
Thys
OS reset
OS active
reading temperature limits
OS output in comparator mode
OS reset
OS active
(1) (1)
OS output in interrupt mode
(1)
002aah455
(1) OS is reset by either reading register or putting the device in shutdown mode. It is assumed that
the fault queue is met at each Tots and Thys crossing point.
Fig 6. OS response to temperature
7.2 I2C-bus serial interface
The device can be connected to a compatible 2-wire serial interface Fast-mode Plus
I2C-bus as a slave device under the control of a controller or master device, using two
device terminals, SCL and SDA. The controller must provide the SCL clock signal and
write/read data to/from the device through the SDA terminal. Notice that if the I2C-bus
common pull-up resistors have not been installed as required for I2C-bus, then an external
pull-up resistor, about 1.5 k, is needed for each of these two terminals. The bus
communication protocols are described in Section 7.10.
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.
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부품번호상세설명 및 기능제조사
PCT2075TP

digital temperature sensor and thermal watchdog

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