PCT2075
I
2
C-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 I
2
C-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 I
2
C-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.
NXP Semiconductors
PCT2075
I
2
C-bus Fm+ digital temperature sensor and thermal watchdog
2. Features and benefits
Pin-for-pin replacement for LM75 series but allows up to 27 devices on the bus
Power supply range from 2.7 V to 5.5 V
Temperatures range from
55 C
to +125
C
Frequency range 20 kHz to 1 MHz with SMBus time-out to prevent hanging up the bus
1 MHz Fast-mode Plus 30 mA SDA drive allows more devices on the same bus but is
backward compatible to Fast-mode and Standard-mode
11-bit ADC that offers a temperature resolution of 0.125
C
Temperature accuracy of:
1 C
(max.) from
25 C
to +100
C
2 C
(max.) from
55 C
to +125
C
Programmable temperature threshold and hysteresis set points during operation
Supply current of <1.0
A
in shut-down mode for power conservation
Stand-alone operation as thermostat at power-up
ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per
JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Small 8-pin package types: SO8, TSSOP8 and 2 mm
3 mm HWSON8
Small 6-pin package type: TSOP6
3. Applications
System thermal management
Personal computers
Electronics equipment
Industrial controllers
PCT2075
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 21 May 2013
2 of 37
NXP Semiconductors
PCT2075
I
2
C-bus Fm+ digital temperature sensor and thermal watchdog
4. Ordering information
Table 1.
Ordering information
Topside
mark
PCT2075
P2075
P2075
075
075
Package
Name
SO8
TSSOP8
TSSOP8
HWSON8
TSOP6
Description
plastic small outline package; 8 leads; body width 3.9 mm
plastic thin shrink small outline package; 8 leads;
body width 3 mm
plastic thin shrink small outline package; 8 leads;
body width 3 mm
Version
SOT96-1
SOT505-1
SOT505-1
Type number
PCT2075D
PCT2075DP
PCT2075DP/Q900
PCT2075TP
PCT2075GV
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
Orderable
part number
PCT2075D,118
PCT2075DP,118
PCT2075DP/Q900J
PCT2075TP,147
PCT2075GVH
Package
Packing method
Minimum
order
quantity
2500
2500
2500
4000
3000
Temperature
Type number
PCT2075D
PCT2075DP
PCT2075DP/Q900
PCT2075TP
PCT2075GV
SO8
TSSOP8
TSSOP8
Reel 13” Q1/T1
*standard mark SMD
Reel 13” Q1/T1
*standard mark SMD
Reel 13” Q1/T1
*standard mark SMD
T
amb
=
55 C
to +125
C
T
amb
=
55 C
to +125
C
T
amb
=
55 C
to +125
C
T
amb
=
55 C
to +125
C
T
amb
=
55 C
to +125
C
HWSON8 Reel 7” Q2/T3
*standard mark
TSOP6
Reel 7” Q3/T4
*standard mark
PCT2075
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 21 May 2013
3 of 37
NXP Semiconductors
PCT2075
I
2
C-bus Fm+ digital temperature sensor and thermal watchdog
5. Block diagram
V
CC
PCT2075
BIAS
REFERENCE
POINTER
REGISTER
COUNTER
11-BIT
SIGMA-DELTA
A-to-D
CONVERTER
CONFIGURATION
REGISTER
TEMPERATURE
REGISTER
TOS
REGISTER
THYST
REGISTER
OS
BAND GAP
TEMP SENSOR
TIDLE/TIMER
COMPARATOR/
INTERRUPT
OSCILLATOR
POWER-ON
RESET
LOGIC CONTROL AND INTERFACE
002aag634
A2
A1
A0
SCL SDA
GND
Fig 1.
Block diagram of PCT2075
6. Pinning information
6.1 Pinning
SDA
SCL
OS
GND
1
2
8
7
V
CC
A0
A1
A2
SDA
SCL
OS
GND
1
2
3
4
002aag636
8
PCT2075DP
PCT2075DP/Q900
7
6
5
V
CC
A0
A1
A2
PCT2075D
3
4
002aag635
6
5
Fig 2.
Pin configuration for SO8
Fig 3.
Pin configuration for TSSOP8
terminal 1
index area
SDA
SCL
OS
GND
1
2
8
7
V
CC
A0
A1
A2
V
CC
002aag637
A0
1
6
SDA
PCT2075TP
3
4
6
5
GND
2
PCT2075GV
5
OS
3
002aag638
4
SCL
Transparent top view
Fig 4.
PCT2075
Pin configuration for HWSON8
Fig 5.
Pin configuration for TSOP6
© NXP B.V. 2013. All rights reserved.
All information provided in this document is subject to legal disclaimers.
Product data sheet
Rev. 3 — 21 May 2013
4 of 37
NXP Semiconductors
PCT2075
I
2
C-bus Fm+ digital temperature sensor and thermal watchdog
6.2 Pin description
Table 3.
Symbol
SDA
SCL
OS
GND
A2
A1
A0
V
CC
[1]
Pin description for SO8, TSSOP8 and HWSON8
Pin
1
2
3
4
[1]
5
6
7
8
Description
Digital I/O. I
2
C-bus serial bidirectional data line; open-drain.
Digital input. I
2
C-bus serial clock input.
Overtemp Shutdown output; open-drain.
Ground. To be connected to the system ground.
Digital input. User-defined address bit 2.
Digital input. User-defined address bit 1.
Digital input. User-defined address bit 0.
Power supply.
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
V
CC
SCL
OS
SDA
Pin description for TSOP6
Pin
1
2
3
4
5
6
Description
Digital input. User-defined address bit 0.
Ground. To be connected to the system ground.
Power supply.
Digital input. I
2
C-bus serial clock input.
Overtemp Shutdown output; open-drain.
Digital I/O. I
2
C-bus serial bidirectional data line; open-drain.
PCT2075
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 21 May 2013
5 of 37
