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PCT2075GV の電気的特性と機能

PCT2075GVのメーカーはNXP Semiconductorsです、この部品の機能は「digital temperature sensor and thermal watchdog」です。


製品の詳細 ( Datasheet PDF )

部品番号 PCT2075GV
部品説明 digital temperature sensor and thermal watchdog
メーカ NXP Semiconductors
ロゴ NXP Semiconductors ロゴ 




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PCT2075GV Datasheet, PCT2075GV PDF,ピン配置, 機能
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





PCT2075GV pdf, ピン配列
NXP Semiconductors
PCT2075
I2C-bus Fm+ digital temperature sensor and thermal watchdog
4. Ordering information
Table 1. Ordering information
Type number
Topside
mark
Package
Name
PCT2075D
PCT2075 SO8
PCT2075DP
P2075
TSSOP8
PCT2075DP/Q900 P2075
TSSOP8
PCT2075TP 075 HWSON8
PCT2075GV 075 TSOP6
Description
Version
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
plastic thin shrink small outline package; 8 leads;
body width 3 mm
SOT505-1
plastic thin shrink small outline package; 8 leads;
body width 3 mm
SOT505-1
plastic thermal enhanced very very thin small outline package; SOT1069-2
no leads; 8 terminals, 2 3 0.8 mm
plastic thin small outline package; 6 leads
SOT1353-1
4.1 Ordering options
Table 2. Ordering options
Type number
Orderable
part number
Package Packing method
PCT2075D
PCT2075DP
PCT2075DP/Q900
PCT2075TP
PCT2075GV
PCT2075D,118
PCT2075DP,118
PCT2075DP/Q900J
PCT2075TP,147
PCT2075GVH
SO8
Reel 13” Q1/T1
*standard mark SMD
TSSOP8 Reel 13” Q1/T1
*standard mark SMD
TSSOP8 Reel 13” Q1/T1
*standard mark SMD
HWSON8 Reel 7” Q2/T3
*standard mark
TSOP6
Reel 7” Q3/T4
*standard mark
Minimum
order
quantity
2500
Temperature
Tamb = 55 C to +125 C
2500
Tamb = 55 C to +125 C
2500
Tamb = 55 C to +125 C
4000
Tamb = 55 C to +125 C
3000
Tamb = 55 C to +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.
3 of 37


3Pages


PCT2075GV 電子部品, 半導体
NXP Semiconductors
PCT2075
I2C-bus Fm+ digital temperature sensor and thermal watchdog
7. Functional description
7.1 General operation
The PCT2075 uses the on-chip band gap sensor to measure the device temperature with
the resolution of 0.125 C and stores the 11-bit two’s complement digital data, resulted
from 11-bit A-to-D conversion, into the device Temp register. This Temp register can be
read at any time by a controller on the I2C-bus. Reading temperature data does not affect
the conversion in progress during the read operation.
The PCT2075 can be set to operate in either mode: normal or shutdown. In normal
operation mode, the temp-to-digital conversion is executed every 100 ms or other
programmed value and the Temp register is updated at the end of each conversion.
During each ‘conversion period’ (Tconv) of about 100 ms, the device takes only about
28 ms, called ‘temperature conversion time’ (tconv(T)), to complete a temperature-to-data
conversion and then becomes idle for the time remaining in the period. This feature is
implemented to significantly reduce the device power dissipation.
In shutdown mode, the device becomes idle, data conversion is disabled and the Temp
register holds the latest result; however, the device I2C-bus interface is still active and
register write/read operation can be performed. The device operation mode is controllable
by programming bit B0 of the configuration register. The temperature conversion is
initiated when the device is powered-up or put back into normal mode from shutdown.
In addition, at the end of each conversion in normal mode, the temperature data (or Temp)
in the Temp register is automatically compared with the overtemperature shutdown
threshold data (or Tots) stored in the Tos register, and the hysteresis data (or Thys) stored
in the Thyst register, in order to set the state of the device OS output accordingly. The
device Tos and Thyst registers are write/read capable, and both operate with 9-bit
two’s complement digital data. To match with this 9-bit operation, the Temp register uses
only the 9 MSB bits of its 11-bit data for the comparison. Tots must always be higher than
Thys.
The way that the OS output responds to the comparison operation depends upon the OS
operation mode selected by configuration bit B1, and the user-defined fault queue defined
by configuration bits B3 and B4.
In OS comparator mode, the OS output behaves like a thermostat. It becomes active
when the Temp exceeds the Tots, and is reset when the Temp drops below the Thys.
Reading the device registers or putting the device into shutdown does not change the
state of the OS output. The OS output in this case can be used to control cooling fans or
thermal switches.
In OS interrupt mode, the OS output is used for thermal interruption. When the device is
powered-up, the OS output is first activated only when the Temp exceeds the Tots, then it
remains active indefinitely until being reset by a read of any register. Once the OS output
has been activated by crossing Tots and then reset, it can be activated again only when
the Temp drops below the Thys; then again, it remains active indefinitely until being reset
by a read of any register. The OS interrupt operation would be continued in this sequence:
Tots trip, Reset, Thys trip, Reset, Tots trip, Reset, Thys trip, Reset, etc. Putting the device
into the shutdown mode by setting the bit 0 of the configuration register also resets the OS
output.
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.
6 of 37

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部品番号部品説明メーカ
PCT2075GV

digital temperature sensor and thermal watchdog

NXP Semiconductors
NXP Semiconductors


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