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NOVOSENSE
NST175 0.5°C Accurate Temperature
Sensor with I
2
C and SMBus Interface
Datasheet 1.21
Novosense Confidential Page 1
⚫ Description
The NST175 is a lower power, higher accuracy
digital temperature sensors ideal for negative
temperature coefficient (NTC) and positive
temperature coefficient (PTC) thermistor
replacement. NST175 Compatible with two-wire
SMBus and I
2
C interfaces, supports up to 27
devices address and provides SMBus Reset and
Alert function. The NST175 also feature a SMBus
Alert function. The devices offer a typical
accuracy of 0.5 °C without requiring calibration or
external component signal conditioning. The
NST175 temperature sensors are highly linear and
do not require complex calculations or look-up
tables to derive the temperature. The on-chip 12-
bit analog-to-digital converter (ADC) offers
resolutions down to 0.0625°C. NST175 device
works over a temperature range of –55°C to 125°C ,
which makes it suitable for onboard and off board
applications in automotive, industrial, and
consumer markets. The NST175 is very low power
device, which can be applied in IoT. The NST175
is available in an SOIC-8 package and an MSOP-8
package.
⚫ Applications
➢ General System Thermal Management
➢ Computer Peripheral Thermal Protection
➢ Notebook Computers
➢ Industrial Internet of Things (IoT)
➢ Communications Infrastructure
➢ Power-system monitors
➢ Thermal protection
➢ Environmental Monitoring and HVAC
⚫ Features:
➢ High Accuracy Over –55°C to 125°C
Wide Temperature Range
✓ -20 °C ~ 85 °C : 0.5 °C (Typical)
✓ -20 °C ~ 85 °C : 1 °C (Maximum)
✓ -55 °C ~-20 °C : 2 °C (Maximum)
✓ 85 °C ~125 °C : 2 °C (Maximum)
➢ Proportional to Temperature with
0.0625°C Resolution
➢ Power up Defaults Permit Stand-Alone
Operation as Thermostat
➢ Supports up to 27 Device Addresses
➢ Supply Operation range from 1.62V to
5.5V
➢ Operating current: 30uA(Typical)
➢ Shutdown current: 0.1μA (Typical)
➢ Digital Interface: SMBus, I
2
C
➢ Package
✓ MSOP(8) (3mm x 3mm)
✓ SOIC(8)(4.9mm x 3.91mm)
Typical Application
NST175
Novosense Confidential Page 2
Idenx
1.0 ABSOLUTE MAXIMUM RATINGS ............................................................................................................................... 3
2.0 ELECTRICAL CHARACTERISTICS ............................................................................................................................ 3
2.1. ELECTRICAL CHARACTERISTICS ........................................................................................................................................ 3
2.2. I
2
C TIMING DIAGRAM ....................................................................................................................................................... 5
2.3. I
2
C TIMING CHARACTERISTICS .......................................................................................................................................... 5
3.0 TYPICAL CHARACTERISTICS .................................................................................................................................... 6
4.0 FUNCTION DESCRIPTION ................................................................................................................................................. 7
4.1. FUNCTION DESCRIPTION .................................................................................................................................................... 7
4.2. FEATURE DESCRIPTION ..................................................................................................................................................... 7
4.2.1 Digital Temperature Sensor ...................................................................................................................................... 7
4.2.2 Serial Interface .......................................................................................................................................................... 8
4.2.3 I
2
C Timing Diagram ............................................................................................................................................... 11
4.3 DEVICE FUNCTIONAL MODES ......................................................................................................................................... 14
4.3.1 Shutdown Mode (SD) ............................................................................................................................................. 14
4.3.2 One-shot (OS) ......................................................................................................................................................... 14
4.3.3 Thermostat Mode (TM) .......................................................................................................................................... 14
4.4 PROGRAMMING ............................................................................................................................................................... 14
4.4.1 Pointer Register ...................................................................................................................................................... 14
4.4.2 Temperature Register .............................................................................................................................................. 15
4.4.3 Configuration Register ........................................................................................................................................... 16
5.0 TYPICAL APPLICATION ................................................................................................................................................... 20
5.1 APPLICATION INFORMATION ................................................................................................................................................. 20
5.2 TYPICAL APPLICATION ..................................................................................................................................................... 20
6.0 PACKAGE INFORMATION ............................................................................................................................................... 21
6.1 PINOUT DESCRIPTION ............................................................................................................................................................ 21
6.2 MSOP(8) PACKAGE ......................................................................................................................................................... 22
6.3 SOP(8) PACKAGE ............................................................................................................................................................ 23
7.0 ORDER INFORMATION ............................................................................................................................................... 24
8.0 REVISION HISTORY .......................................................................................................................................................... 25
NST175
Novosense Confidential Page 3
1.0 ABSOLUTE MAXIMUM RATINGS
Parameters
Symbol
Min
Typ
Max
Unit
Comments
Supply Voltage Pin
(VDD)
VDD
-0.3
6.5
V
Voltage at A0, A1and
A2 Pins
A0,A1,A2
-0.3
6.5
V
Voltage at OS, SCL and
SDA Pins
ALERT,SCL,
SDA
-0.3
6.5
V
Storage temperature
-60
155
℃
Operation temperature
TB
operation
-55
125
℃
Maximum junction
temperature
155
℃
ESD susceptibility
HBM
±5
KV
CDM
±1
KV
2.0 ELECTRICAL CHARACTERISTICS
2.1. Electrical characteristics
Parameters
Symbol
Min
Typ
Max
Unit
Comments
Supply
Supply voltage
Range
VDD
1.62
3.3
5.5
V
Pull up resistor
Range
R
pu
0.5
5
10
KΩ
Supply sensitivity
16
m℃/
V
Operation current
Iconv
30
60
uA
Conversion
Shutdown current
I
SD
0.1
uA
Serial bus inactive
I
SD
10
uA
Serial bus active, SCL
frequency = 400 kHz
Temperature Range and Resolution
Temperature Range
-55
125
℃
Resolution
0.0625
℃
Accuracy
-1
0.5
1
℃
From -20℃ to 85℃
2
2
℃
From -50℃ to -20℃
2
2
℃
From 85℃ to125℃
NST175
Novosense Confidential Page 4
Conversion time
T
CONV
24
32
ms
For VDD<2V,the max
conversion time 64 ms.
ALERT Output
Saturation Voltage
0.5
V
I
OUT
= 4 mA
ALERT Delay
1
6
conve
rsion
High limit Default
Temperature
T
H
80
℃
Low limit Default
Temperature
T
L
75
℃
Time out time
T
TIMEOUT
54
ms
Digital DC Characteristics
VIN(1) Logical “1”
Input Voltage
VH
VDD*0.7
VDD+0.3
V
VIN(0) Logical “0”
Input Voltage
VL
-0.3
VDD*0.3
V
IIN(1) Logical “1”
Input Current
1
uA
IIN(0) Logical “0”
Input Current
-1
uA
CIN All Digital
Inputs
C
IN
5
pF
IOH High Current
Level Output Open
drain leakage
IOH
1
uA
V
OH
=5V
Low Level Output
Voltage
VOL
0.4
V
IOL= 3 mA;
Thermal response
Stirred oil thermal
response time to
63% of final value
(package only)
0.75
s
MSOP(8)
Drift
Drift
1
0.1
℃
Notes: 1. Drift data is based on a 1000-hour stress test at +125°C with VDD = 5.5V.
NST175
Novosense Confidential Page 5
2.2. I
2
C Timing Diagram
Figure 2.1 I
2
C Timing Diagram
2.3. I
2
C Timing characteristics
Parameters
Symbol
FAST MODE
HIGH-SPEED MODE
Unit
Comments
Min
Max
Min
Max
SCL operating
frequency
F
SCL
0.001
0.4
0.001
2
MHz
Bus-free time between
STOP and START
conditions
t
(BUF)
1300
160
ns
Hold time after
repeated START
condition; after this
period, the first clock
is generated
t
(HDSTA)
600
160
ns
Repeated START
condition setup time
t
(SUSTA)
600
160
ns
STOP condition setup
time
t
(SUSTO)
600
160
ns
Data hold time
T
(HDDAT)
4
900
4
120
ns
Data setup time
T
(SUDAT)
100
10
ns
SCL clock low period
T
(LOW)
1300
280
ns
SCL clock high period
T
(HIGH)
600
60
ns
Data fall time
t
F
D
300
150
ns
Clock rise time
t
RC
300
40
ns
1000
ns
Clock fall time
t
FC
300
40
ns
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