TEMPERATURE SENSOR IC
WSEN-TIDS
USER MANUAL
2521020222501
VERSION 1.0
FEBRUARY 7, 2020
Revision history
Manual
version
1.0
Notes
• Initial release of the manual
Date
February 2020
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 1
Abbreviations
Abbreviation Description
ASIC Application Specific Integrated Circuit
BDU Block Data Update
ESD Electrostatic Discharge
HBM Human Body Model
IC Integrated Circuit
I2C Inter Integrated Circuit
LSB Least Significant Bit
MSB Most Significant Bit
ODR Output Data Rate
PCB Printed Circuit Board
RH Relative humidity
UDFN Ultra-Dual Flat No Lead
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 2
Contents
1 Introduction 5
1.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Key features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Sensor specifications 6
2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Temperature sensor specification . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Pinning information 9
3.1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Digital interface 10
4.1 General characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 SDA and SCL logic levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Communication phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3.1 Idle state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3.2 START(S) and STOP(P) condition . . . . . . . . . . . . . . . . . . . 11
4.3.3 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3.4 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3.5 Acknowledge(ACK) and No-Acknowledge(NACK) . . . . . . . . . . 12
4.3.6 Slave address for the sensor . . . . . . . . . . . . . . . . . . . . . . 13
4.3.7 Read/Write operation . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 I2C timing parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Application circuit 17
6 Quick start guide 18
6.1 Powe-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2 Communication with host controller . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Sensor operation: single conversion mode . . . . . . . . . . . . . . . . . . . 19
6.4 Sensor operation: continuous mode . . . . . . . . . . . . . . . . . . . . . . 20
6.5 Modes of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.6 Power-down mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.7 Single conversion mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.8 Continuous mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7 Reading temperature data 24
8 Interrupt functionality 26
8.1 Interrupt output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Register map 28
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 3
10 Register description 29
10.1 DEVICE_ID (0x01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.2 T_H_LIMIT (0x02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.3 T_L_LIMIT (0x03) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.4 CTRL (0x04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10.5 STATUS (0x05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10.6 DATA_T_L (0x06) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.7 DATA_T_H (0x07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.8 SOFT_RESET (0x0C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11 Physical dimensions 34
11.1 Sensor drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
11.2 Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12 Manufacturing information 36
12.1 Moisture sensitivity level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
12.2 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
12.2.1 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
12.2.2 Cleaning and washing . . . . . . . . . . . . . . . . . . . . . . . . . 38
12.2.3 Potting and coating . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
12.2.4 Storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
12.2.5 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
13 Important notes 40
13.1 General customer responsibility . . . . . . . . . . . . . . . . . . . . . . . . . 40
13.2 Customer responsibility related to specific, in particular safety-relevant ap-
plications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
13.3 Best care and attention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
13.4 Customer support for product specifications . . . . . . . . . . . . . . . . . . 40
13.5 Product improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
13.6 Product life cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
13.7 Property rights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
13.8 General terms and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 41
14 Legal notice 42
14.1 Exclusion of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
14.2 Suitability in customer applications . . . . . . . . . . . . . . . . . . . . . . . 42
14.3 Usage restriction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
15 License terms for Würth Elektronik eiSos GmbH & Co. KG sensor product
software and source code 44
15.1 Limited license . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
15.2 Usage and obligations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
15.3 Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
15.4 Disclaimer of warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
15.5 Limitation of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
15.6 Applicable law and jurisdiction . . . . . . . . . . . . . . . . . . . . . . . . . . 45
15.7 Severability clause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
15.8 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 4
1 Introduction
This user manual describes a silicon-based, high precision digital temperature IC sensor
embedded with an analog and digital signal processing unit. The integrated ASIC with digital
I2C interface provides a factory calibrated 16-bit temperature data to the host controller. The
operating voltage of the sensor from 1.5 V to 3.6 V and the typical current consumption of
1.75 µA makes it suitable for battery operated applications. Compact 6-lead UDFN package
with a form factor of 2.0×2.0×0.5 mm provides a fast thermal response. The exposed pad at
the bottom provides better temperature match with the surrounding environment.
1.1 Applications
• Power system monitoring
• PCB thermal monitoring
• HVAC
• Thermocouple cold junction compensation
• Industrial control
• Environmental monitoring
• Cold-chain industry (transport & storage)
1.2 Key features
• Temperature range: -40 to 125 °C
• Output data rate: 25 Hz upto 200 Hz
• Temperature data: 16-bits
• Low current consumption: 1.75 µA in single conversion mode
• Digital interface: I2C
• Interrupt pin functionality: programmable temperature threshold
1.3 Ordering information
WE order code Dimensions Description
2521020222501 2.0 x 2.0 x 0.5 mm Tape & reel packaging
2521020222581 2.0 x 2.0 x 0.5 mm 5 pcs cut tape packaging
2521020222591 33 x 20 x 7 mm Evaluation board temperature sensor IC
Table 1: Ordering information
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 5
2 Sensor specifications
2.1 General information
Parameter Value
Operating temperature -40°C up to 125°C
Storage conditions <40°C; <75% RH
Communication interface I2C
Moisture sensitivity level (MSL) 1
Electrostatic discharge protection (HBM) 2 kV
Table 2: General information
2.2 Absolute maximum ratings
Absolute maximum ratings are the limits; the device can be exposed to without causing
permanent damage. Exposure to absolute maximum conditions for extended periods may
affect device reliability.
Parameter Symbol
Input voltage VDD pin V
Input voltage SDA, SCL & SAO pins V
Table 3: Absolute maximum ratings
Supply voltage on any pin should never exceed 4.8 V.
The device is susceptible to be damaged by electrostatic discharge (ESD).
Always use proper ESD precautions when handling. Improper handling of the
device can cause performance degradation or permanent damage.
DD_MAX
IN_MAX
Value
Unit
Min Max
-0.3 4.8 V
-0.3 VDD+0.3 V
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 6
2.3 Temperature sensor specification
Unless otherwise stated, all specified values were measured under the following conditions:
T=25°C, VDD=3.3 V.
Parameter
Measurement
range
Absolute accuracy
Total accuracy
Resolution
Sensitivity
Output data rate
Noise (RMS)
1
Boot-on time
Symbol
Test conditions
Min Typ Max
Value
T
RANGE
T
ACC_ABS
T
ACC_TOT
RES
SEN
ODR
T= -10 to 60°C -0.5 ±0.25 0.5 °C
T= -40 to 125°C -1.0 ±0.7 1.0 °C
T
T
Continuous
mode
-40 125 °C
25 200 Hz
ODR= 25 Hz 0.025
ODR= 50 Hz 0.035
T
NOISE
ODR= 100 Hz 0.050
ODR= 200 Hz 0.060
t
BOOT
Table 4: Temperature sensor specifications
Unit
16 bit
0.01 °C/digit
°C RMS
12 ms
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 7
2.4 Electrical specifications
Unless otherwise stated, all specified values were measured under the following conditions:
T=25°C, VDD=3.3V.
Parameter
Operating supply voltage
Current consumption in
power down mode
Current consumption in
single conversion mode
Peak current
consumption
Digital input voltage -
high-level
Digital input voltage -
low-level
Digital output voltage -
high-level
Digital output voltage -
low-level
2
Symbol
V
DD
I
DD_PD
I
DD_SC
I
DD_PEAK
V
IH
V
IL
V
OH
V
IL
Test conditions
During
conversion
Value
Min Typ Max
1.5 3.3 3.6
0.6
1.75
120 180
0.7*V
DD
V
DD_IO
-0.2
0.3*V
0.4
DD
Unit
V
µA
µA
µA
V
V
V
V
Table 5: Electrical specifications
1. Temperature noise RMS is measured in a controlled environment.
2. Averaged supply current with one measurement per second
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 8
3 Pinning information
3.1 Pin configuration
Figure 1: Pin specifications (top view)
3.2 Pin description
Pin
No.
1 SCL I2C serial clock Input
2 INT Interrupt Output Do not connect if not used
3 VDD Positive supply voltage Supply
4 SAO
5 GND
6 SDA I2C serial data Input/Output
Name Function I/O Comments
I2C device address
selection
Negative supply
voltage
Table 6: Pin description
Input
Supply
High: device address is 0111000b
Low: device address is 0111111b
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 9
4 Digital interface
Microcontroller
(Master)
R
p
R
p
Sensor
(Slave-1)
Sensor
(Slave-2)
+VDD
SCL
(serial clock)
SDA
(serial data)
Pull up resistors
The sensor supports standard I2C (Inter-IC) bus protocol. Further information about the I2C
interface can be found at https://www.nxp.com/docs/en/user-guide/UM10204.pdf . I2C is a
serial 8-bit protocol with two-wire interface that supports communication between different
ICs, for example, between microcontrollers and other peripheral devices.
4.1 General characteristics
A serial data line (SDA) and a serial clock line (SCL) are required for the communication
between the devices connected via I2C bus. Both SDA and SCL lines are bidirectional. The
output stages of devices connected to the bus must have an open-drain or open-collector.
Hence, the SDA and SCL lines are connected to a positive supply voltage via pull-up resistors. In I2C protocol, the communication is realized through master-slave principle. A master
device generates the clock pulse, a start command and a stop command for the data transfer. Each connected device on the bus is addressable via a unique address. Master and
slave can act as a transmitter or a receiver depending upon whether the data needs to be
sent or received.
This sensor behaves like a slave device on the I2C bus.
Temperature Sensor IC, Part Nr. 2521020222501
Figure 2: Master-slave concept
User manual version 1.0 © February 2020
www.we-online.com/sensors 10
4.2 SDA and SCL logic levels
Voltage
low
high
Time
V
DD
GND
0.2 x V
DD
0.8 x V
DD
The positive supply voltage to which SDA and SCL lines are pulled up (through pull-up
resistors), in turn determines the high level input for the slave devices. The logic high ’1’ and
logic low ’0’ levels for the SDA and SCL lines then depend on the VDD. Input reference levels
for this sensor are set as 0.8 * VDD (for logic high) and 0.2 * VDD (for logic low). Explained
in the figure3.
Figure 3: SDA and SCL logic levels
4.3 Communication phase
4.3.1 Idle state
During the idle state, the bus is free and both SDA and SCL lines are in logic high ’1’ state.
4.3.2 START(S) and STOP(P) condition
Data transfer on the bus starts with a START command, which is generated by the master.
A start condition is defined as a high-to-low transition on the SDA line while the SCL line is
held high. The bus is considered busy after the start condition.
Data transfer on the bus is terminated with a STOP command, which is also generated by
the master. A low-to-high transition on the SDA line, while the SCL line being high is defined
as a STOP condition. After the stop condition, the bus is again considered free and is in idle
state. Figure4shows the I2C bus START and STOP conditions.
Master can also send a REPEATED START (SR) command instead of STOP command.
REPEATED START condition is the same as the START condition.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 11
4.3.3 Data validity
SDA
SCL
START
Condition
STOP
Condition
Valid
data
Valid change
of data
After the start condition, one data bit is transferred with each clock pulse. The transmitted
data is only valid when the SDA line data is stable (high or low) during the high period of the
clock pulse. High or low state of the data line can only change when clock pulse is in low
state.
Figure 4: Data validity, START and STOP condition
4.3.4 Byte format
Data transmission on the SDA line is always done in bytes, with each byte being 8-bits long.
Data is transferred with the most significant bit (MSB) followed by other bits.
If the slave cannot receive or transmit another complete byte of data, it can force the master
into a wait state by holding SCL low. Data transfer continues when the slave is ready which
is indicated by releasing the SCL line.
4.3.5 Acknowledge(ACK) and No-Acknowledge(NACK)
Each byte sent on the data line must be followed by an Acknowledge bit. The receiver (master or slave) generates an Acknowledge signal to indicate that the data byte was received
successfully and another data byte could be sent.
After one byte is transmitted, the master generates an additional Acknowledge clock pulse
to continue the data transfer. The transmitter releases the SDA line during this clock pulse
so that the receiver can pull the SDA line to low state in such a way that the SDA line
remains stable low during the entire high period of the clock pulse. This is considered as an
Acknowledge signal.
In case the receiver does not want to receive any further byte, it does not pull down the SDA
line and it remains in stable high state during the entire clock pulse. This is considered as
a No-Acknowledge signal and the master can generate either a stop condition to terminate
the data transfer or a repeated start condition to initiate a new data transfer.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 12
4.3.6 Slave address for the sensor
The slave address is transmitted after the start condition. Each device on the I2C bus has a
unique address. Master selects the slave by sending corresponding address after the start
condition. A slave address is 7 bits long followed by a Read/Write bit.
Depending on the connection of the SAO pin, the 7-bit slave address for this sensor can
either be 0111000b or 0111111b. When SAO is connected to positive supply voltage, the
7-bit slave address is 0111000b (0x38). If SAO is connected to ground, 7-bit slave address
is 0111111b (0x3F).
The R/W bit determines the data direction. A ’0’ indicates a write operation (transmission
from master to slave) and a ’1’ indicates a read operation (data request from slave).
Slave address[6:3]
0111 0 01110000b (0x70)
0111
0111 0 01111110b (0x7E)
0111
Slave address[2:0]
000
7-bit slave address R/W Slave address + R/W
0111000b (0x38)
1 01110001b (0x71)
111
0111111b (0x3F)
1 01111111b (0x7F)
Table 7: Slave address and Read/Write commands
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 13
4.3.7 Read/Write operation
START
Condition
STOP
Condition
1...7 8 9 1.. .8
9
1...8 9
7-bit
Address
Read/
Write
ACK
Register
Address
ACK NACKData
Once the slave-address and data direction bit is sent, the slave acknowledges the master.
The next byte sent by the master must be a register-address of the sensor. This indicates
the address of the register where data needs to be written to or read from.
Figure 5: Complete data transfer
After receiving the register address, the slave sends an Acknowledgement (ACK). If the
master is still writing to the slave (R/W bit = 0), it will transmit the data to slave in the same
direction. If the master wants to read from the addressed register (R/W bit =1), a repeated
start (SR) condition must be sent to the slave. Master acknowledges the slave after receiving
each data byte. If the master no longer wants to receive further data from the slave, it would
send No-Acknowledge (NACK). Afterwards, Master can send a STOP condition to terminate
the data transfer. Figure6shows the writing and reading procedures between the master
and the slave device (sensor).
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 14
S
Slave address
+ Write
ACK
Register
address
DataACK ACK P
S
Slave address
+ Write
ACK
Register
address
Slave address
+ Read
ACK ACKSR Data Data NACKACK
Transmission from master to slave
Transmission from slave to master
S
P
ACK
NACK
SR
START condition
STOP condition
Acknowledge
No acknowledge
Repeated start condition
a) I2C write: Master writing data to slave
b) I2C read: Master reading multiple data bytes from slave
P
Figure 6: Write and read operations with the device
7-bit slave address of this device can be set to either 0x38 or 0x3F. 7-bit slave
address depends on the SAO pin connection.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 15
4.4 I2C timing parameters
Parameter Symbol
SCL clock frequency f
LOW period for SCL clock t
HIGH period for SCL clock t
Hold time for START
condition
Setup time for (repeated)
START condition
SDA setup time t
SDA data hold time t
Setup time for STOP
condition
Bus free time between
STOP and START condition
SCL
LOW_SCL
HIGH_SCL
t
HD_S
f
SCL
SU_SDA
HD_SDA
t
SU_P
t
BUF
Table 8: I2C timing parameters
VDD< 3 V
1
VDD>3 V
1
Unit
Min Max Min Max
10 400 0.01 1000 kHz
1.3 0.6 µs
0.6 0.16 µs
0.6 0.26 µs
0.6 0.26 µs
100 0.5 µs
0 0 µs
0.6 0.26 µs
1.3 0.5 µs
1. Values measured at 25°C with the SDA and SCL connected to VDD via pull up resistors.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 16
5 Application circuit
1
2
3
6
5
4
R
p
VDD
R
p
VDD
V
DD
100 nF
VDD
INT
SCL
SDA
GND
SAO
VDD
SDASCL
Figure 7: Application circuit with I2C interface (sensor bottom view)
VDD pin is the central supply pin for the MEMS cell and internal circuits. In order to prevent
ripple from the power supply, a decoupling capacitor of 100 nF must be placed as close to
the VDD pad of the sensor as possible. An optional decoupling capacitor (4.7 µF) could be
placed parallel to the 100 nF capacitor.
Figure7shows a typical application circuit for I2C communication. Least significant bit of
the 7-bit slave address can be modified based on the status of the SAO pin. When SAO is
connected to VDD, the 7-bit slave address is 0x38 (0111000b). Refer to table7for more
information. SCL and SDA must be connected to VDD through the pull-up resistors. Proper
value of the pull-up resistors must be chosen depending on the I2C bus speed and load.
INT pin is an open drain output and must be connected to VDD via pull-up resistors when
used.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 17
6 Quick start guide
Power up
Wait for
12 ms
Device Id=
0xA0 ?
Read DEVICE_ID register
Address: 0x01
Communication
successful
No communication
with the device
Yes
No
No Yes
6.1 Powe-up sequence
The sensor is powered up when supply voltage is applied to VDD. During the power up
sequence, it is recommended to keep the I2C interface pins in the high impedance state
from the host controller side.
Wait at least 12 ms before accessing the internal registers after the device is
powered on.
6.2 Communication with host controller
Communication with the host controller via I2C interface can be checked by reading the
DEVICE_ID register (0x01). Device ID for this sensor is 0xA0.
Figure 8: Communication check between host controller and the sensor
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 18
6.3 Sensor operation: single conversion mode
Power-down
mode
Read temperature data
registers (0x06 – 0x07)
No
Yes
Set bit ONE_SHOT=‘1‘
in CTRL register (0x04)
Power-down
mode
Trigger one set of data convers ion by
setting ONE_SHOT bit to '1'
Get temperature values in SI
unit
Combine corresponding data
registers and multiply the decimal
value with the sensitivity parameter;
SENT=0.01
New set of data?
Bit BUSY =‘0‘ ?
Read STATUS register (0x05)
No
Yes
Check if new temperature
measurement is available based on
BUSY bi t
Set bit SWRESET=‘1‘
in SOFT_RESET register (0x0C)
Set bit SWRESET=‘0‘
in SOFT_RESET register (0x0C)
Enable software reset
Disable software reset; Opera ting
modes are available
Flow chart shows sensor operation in the single conversion mode.
Figure 9: Sensor operation: single-conversion mode
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 19
6.4 Sensor operation: continuous mode
Power-down mode
Read temperature data registers
(0x06 – 0x07)
Get temperature values in SI unit
Combine corresponding data registers and multiply
the decimal value with the sensitivity parameter;
SENT=0.01
Set bit FREERUN= ‘1‘ and BDU = ‘1‘
in CTRL register (0x04)
Enable continuous mode
Wait t=1/ODR
Set bits AVG[1:0] = ‘01‘
in CTRL register (0x04)
Set sensor in continuous mode with ODR = 50Hz;
Set bit SWRESET=‘1‘
in SOFT_RESET register (0x0C)
Set bit SWRESET=‘0‘
in SOFT_RESET register (0x0C)
Enable software reset
Disable software reset; Operating
modes are available
Flow chart shows sensor operation in continuous mode at ODR = 50 hz with block data
update enabled.
Figure 10: Sensor operation: continuous mode
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 20
6.5 Modes of operation
The sensor can be configured in the following three different modes
1. Power down mode
2. Single conversion mode
3. Continuous mode
6.6 Power-down mode
The power-down mode can be configured by setting the bit FREERUN in CTRL register
(0x04) to ’0’.
In power-down mode, the digital chain that samples the temperature data is turned off. New
measurement is not performed during this mode. Hence, the temperature data registers are
not updated. The temperature data registers contain the last sampled temperature value
before going into power-down mode. Current consumption is at the minimum during this
mode.
However, serial communication with the host controller via I2C bus is still possible. This
allows the user to configure the device by accessing the control registers and temperature
threshold registers.
Sensor is in power-down mode by default after the power-up sequence.
Before changing the operating mode or the ODR, the device must be first configured into power down mode.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 21
6.7 Single conversion mode
Temperature
data
Time [s]
1
st
Measurement
2
nd
Measurement
3
rd
Measurement
T T T T T T
Power down
mode
New measurement trigger
ONE_SHOT bit = '1'
Measurement
in progress
Soft-
ware
Reset
Soft-
ware
Reset
Soft-
ware
Reset
bit BUSY = '1'
In this mode, a single measurement of temperature is performed according to the request of
the host controller. This mode can be activated when the sensor is in the power-down mode.
When ONE_SHOT bit of CTRL register (0x04) is set to ’1’, the digital chain is turned on, data
conversion starts and a single measurement of temperature is acquired. This measurement
data is written to the temperature data registers. Afterwards, the digital chain is turned off
again and the sensor enters the power-down mode. Bit BUSY in STATUS register stays ’1’
during the measurement is in progress. Temperature data registers are not updated until the
host controller requests another data acquisition. This mode is useful when the application
demands reduced power consumption.
Before requesting a new temperature data through ONE_SHOT bit, a software
reset procedure must be performed each time.
During this mode the output data rate (ODR) of the sensor depends on the new measurement request from the host controller (frequency at which the ONE_SHOT bit is set to ’1’).
Single conversion mode can be used for measurement frequencies up to 1 Hz
Figure 11: Application circuit with I2C interface (sensor bottom view)
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 22
6.8 Continuous mode
The sensor is configured in the continuous mode when the FREERUN bit of CTRL register
(0x04) is set to ’1’. The continuous mode constantly samples new temperature measurements and writes the data to the temperature data registers. The measurement rate is
defined by the user selectable output data rate (ODR) which can be set by AVG[1:0] bits of
CTRL register. Selectable ODR and corresponding register settings are shown in the table9.
FREERUN AVG[1:0] Output data rate [Hz]
1 00 25
1 01 50
1 10 100
1 11 200
Table 9: Output data rate selection
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 23
7 Reading temperature data
1 1 1 00 0 0 0 0 0 1 00 1 0 0
DATA_T_H = 0x0E DATA_T_L = 0x42
T
16bit
= 0x0E42 = 3650
T = 3650 * 0.01 = 36.50 °C
Once the device is configured in one of the operating modes, temperature values are sampled and stored in the temperature data registers, available for the user to read.
It is recommended to read the data registers starting from the lower address
to the higher address.
Temperature values are stored in the two data registers: DATA_T_L (0x06) and DATA_T_H
(0x07). Each register contains 8-bits data. The complete temperature data is a 16-bit signed
2’s complement word. This can be obtained by concatenating the two 8-bit temperature
data registers: DATA_T_H & DATA_T_L, with DATA_T_H being most significant byte and
DATA_T_L being least significant byte.
After calculating the 16-bit digital temperature value, it must be multiplied with the sensitivity
parameter, SENT(see table4) in order to obtain the corresponding temperature in SI unit
(°C).
Step 1: Reading raw data from the two temperature data registers
1. DATA_T_L (0x06)
2. DATA_T_H (0x07)
Step 2: Concatenating the temperature data registers to obtain complete 16-bit temperature
value
T
= DATA_T_H & DATA_T_L
16bit
Step 3: Obtaining temperature value in SI unit [°C] by multiplying with sensitivity parameter
Temperature [°C] = T
[digit] ×0.01 [°C/digit]
16bit
Figure 12: Reading temperature data
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 24
Example:
If values obtained from temperature data registers are:
DATA_T_L = 0x42
DATA_T_H = 0x0E
Concatenating these 2 registers (0x0E42) to obtain 16-bit signed decimal value and multiplying with sensitivity parameter
T
[digit] = 3650 [digit]
16bit
T[°C] = 3650 [digit] * 0.01 [°C/digit] = 36.50 °C
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 25
8 Interrupt functionality
The sensor has a dedicated interrupt generator, which generates an interrupt event based
on user defined threshold temperatures. Following two interrupt events are generated
• Temperature high
• Temperature low
Threshold temperatures for the temperature high and low limit interrupt events are defined in
two 8 bit interrupt registers, TEMP_H_LIMIT (0x02) and TEMP_L_LIMIT (0x03) respectively.
If both the registers are ’0’, the interrupt generation is disabled.
Threshold Temperature (°C) = (TEMP_x_LIMIT - 63) ×0.64
The temperature threshold value in °C is calculated based on the formula above. The threshold value ranges from -39.68°C to 122.88°C with the step value of 0.64°C.
When enabled, temperature high and low interrupts are routed to the INT pin
of the sensor. The status of the interrupt event can be monitored through the
STATUS (0x05) register.
Register Value
(TEMP_H_LIMIT /
TEMP_L_LIMIT )
0 Interrupt generation is disabled
1 -39.68
2 -39.04
3 -38.40
... ...
... ...
62 -0.64
63 0
64 0.64
... ...
... ...
254 122.24
255 122.88
Threshold Temperature (°C)
Table 10: Temperature threshold
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 26
8.1 Interrupt output
TEMP_H_LIMIT
TEMP_L_LIMIT
Time (s)
OVER_THL bit
UNDER_TLL bit
STATUS register is read
INT pin
Temperature
The sensor has a dedicated INT pin, to which the interrupt events are routed. The open
drain INT pin is asserted to low state when the measured temperature has exceeded the
user-defined temperature high-limit or fallen below the temperature low-limit. Even if the
temperature falls back between the high and low limits, the INT pin will remain asserted.
The INT pin is de-asserted, once the STATUS(0x05) is read. If the triggering condition is still
true, the INT pin will be re-asserted at the next temperature conversion.
The INT pin is an open drain output. When used, the pin must be connected
to VDD via a pull-up resistor.
Figure 13: Interrupt output
The interrupt event status can also be monitored through UNDER_TLL and OVER_THL
flags in the STATUS (0x05) registers. UNDER_TLL and OVER_THL flags are automatically
set to ’0’, once the STATUS (0x05) register is read.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 27
9 Register map
Addr. Register Name Type
0x01 DEVICE_ID R 1 0 1 0 0 0 0 0
0x02 T_H_LIMIT R/W
0x03 T_L_LIMIT R/W
0x04 CTRL R/W 0 BDU
0x05 STATUS R 0 0 0 0 0
0x06 DATA_T_L R
0x07 DATA_T_H R
0x0C SOFT_RESET R/W 0 0 0 0 0 0
7 6 5 4 3 2 1 0
AVG[1:0]
Bits
THL[7:0]
TLL[7:0]
IF
_ADD
_INC
DATA_T[7:0]
DATA_T[15:8]
FREE-
RUN
UNDER
_TLL
0
OVER
_THL
SW
RE-
SET
ONE
_SHOT
BUSY Status register
Writing to reserved registers may cause permanent damage to the device.
Register addresses not listed in the above table, must not be accessed and
content must not be modified.
0
Comments
Device ID
register
Temperature
limit register
Control register
Temperature
output registers
Software reset
register
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 28
10 Register description
10.1 DEVICE_ID (0x01)
Address: 0x01
Type: R
Default Value: 10100000b (0xA0)
7 6 5 4 3 2 1 0
1 0 1 0 0 0 0 0
Device ID for this sensor is a fixed number (0xA0) which is stored in this register.
10.2 T_H_LIMIT (0x02)
Address: 0x02
Type: R
Default Value: 00000000b
7 6 5 4 3 2 1 0
THL[7:0]
THL[7:0] Unsigned value of high-limit threshold. Refer table10for more infor-
mation.
Threshold Temperature = (T_H_LIMIT - 63) ×0.64 °C
10.3 T_L_LIMIT (0x03)
Address: 0x03
Type: R
Default Value: 00000000b
7 6 5 4 3 2 1 0
TLL[7:0]
TLL[7:0] Unsigned value of low-limit threshold. Refer table10for more infor-
mation.
Threshold Temperature = (T_L_LIMIT - 63) ×0.64 °C
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 29
10.4 CTRL (0x04)
Address: 0x04
Type: R/W
Default Value: 00000000b
7 6 5 4 3 2 1 0
0 BDU
BDU Block data update feature
0: data register updates continuously; 1: data registers not updated
until MSB and LSB has been read.
AVG[1:0] ODR selection in continuous mode (if FREERUN bit = ’1’ in CTRL
register).
AVG[1:0] Output Data Rate [Hz]
00 25
01 50
10 100
11 200
AVG[1:0]
Table 11: Output data rate selection
IF _ADD
_INC
FREE-
RUN
0
ONE
_SHOT
Sensor is configured in continuous mode by setting FREERUN bit to ’1’.
IF_ADD_INC Register address is automatically incremented during multiple byte
access
0: disabled; 1: enabled
This is a multi-read/write feature that enables a repeated read/write
operation during a single bus transaction by automatically incrementing the register address.
FREERUN Enables continuous mode with a defined ODR
0: Continuous mode disabled; 1: Continuous mode enabled
ONE_SHOT Enables single data acquisition of temperature. For more informa-
tion refer to section
0: normal operation; 1: a new data set is acquired
6.7
.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 30
BDU: Block data update feature
While reading the output data, this feature can be enabled to inhibit the values of data
registers to be updated until all bytes of temperature data registers have been read.
This feature should be enabled when the reading of the data is slower than the output data
rate (ODR). By default, the BDU bit is set to ’0’ and data registers are updated continuously.
When BDU feature is enabled, reading of the temperature values sampled at different times
can be avoided.
For example, when reading of the register DATA_T_L is initialized, the remaining part of the
temperature data registers DATA_T_H is not updated until both bytes (L and H) have been
read.
It is strongly recommended to enable BDU feature. This avoids an update of
the DATA_T_x registers until all the parts of the corresponding DATA_T registers have been read.
If BDU feature is enabled, DATA_T_L register must be read first.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 31
10.5 STATUS (0x05)
Address: 0x05
Type: R
Default Value: Output
7 6 5 4 3 2 1 0
0 0 0 0 0
UNDER_TLL Temperature lower than low limit
0: Temperature is above the low limit or disabled; 1: Temperature
exceeded the low limit
OVER_THL Temperature higher than high limit
0: Temperature is below the high limit or disabled; 1: Temperature
exceeded the high limit
Bits UNDER_TLL and OVER_THL are automatically reset to ’0’ when STATUS
register is read.
BUSY Temperature data conversion status flag during single conversion
mode (bit ONE_SHOT =’1’ in CTRL register)
UNDER
_TLL
OVER
_THL
BUSY
0: data conversion is complete. New temperature data is available;
1: Data conversion in progress
This bit is always ’0’ during continuous mode (bit FREERUN = ’1’ in CTRL
register).
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 32
10.6 DATA_T_L (0x06)
Address: 0x06
Type: R
Default Value: Output
7 6 5 4 3 2 1 0
DATA_T[7:0]
DATA_T[7:0] Low part of the temperature data.
Combine this value with DATA_T_H register value to form a 16-bit
number expressed in a two’s complement, that gives the temperature value.
10.7 DATA_T_H (0x07)
Address: 0x07
Type: R
Default Value: Output
7 6 5 4 3 2 1 0
DATA_T[15:8]
DATA_T[15:8] High part of the temperature data.
Combine this value with DATA_T_L register value to form a 16-bit
number expressed in a two’s complement, that gives the temperature value.
10.8 SOFT_RESET (0x0C)
Address: 0x0C
Type: R/W
Default Value: 0x00
7 6 5 4 3 2 1 0
0 - 0 0 0 0
SW
RESET
0
SWRESET Performs software reset
0: Software reset disabled and operating mode enabled; 1: Resets
all digital blocks
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 33
11 Physical dimensions
2,0 ±0,05
2,0 ±0,05
0,02
+0,03
-0,02
0,55 max.
h
0,05 A
1,3
1,45 ±0,1
0,245° x
0,65 ±0,1
0,4 ±0,1
0,25 ±0,05
A
1
2
6
5
3
4
Pin 1
11.1 Sensor drawing
Figure 14: Sensor dimensions [mm]
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 34
11.2 Footprint
1,3
3
2
4
5
1
6
0,7
1,78
0,65 0,7
0,27
1,45
Figure 15: Recommended land pattern [mm] (top view)
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 35
12 Manufacturing information
12.1 Moisture sensitivity level
The sensor product is categorized as JEDEC Moisture Sensitivity Level 1 (MSL1), which requires special handling.
More information regarding the MSL requirements can be found in the IPC/JEDEC J-STD-020
standard on www.jedec.org. More information about the handling, picking, shipping and the
usage of moisture/re-flow and/or process sensitive products can be found in the IPC/JEDEC
J-STD-033 standard on www.jedec.org.
12.2 Soldering
12.2.1 Reflow soldering
Attention must be paid on the thickness of the solder resist between the host PCB top
side and the modules bottom side. Only lead-free assembly is recommended according
to JEDEC J-STD020.
Profile feature Value
Preheat temperature Min T
Preheat temperature Max T
Preheat time from T
S Min
to T
S Max
S Min
S Max
t
S
150°C
200°C
60 - 120 seconds
Ramp-up rate (TLto TP) 3°C / second max.
Liquidous temperature T
Time tLmaintained above T
L
Peak package body temperature T
Time within 5°C of actual preak temperature t
L
t
L
P
P
217°C
60 - 150 seconds
see table below
20 - 30 seconds
Ramp-down Rate (TPto TL)* 6°C / second max.
Time 20°C to T
P
8 minutes max.
Table 12: Classification reflow soldering profile, Note: refer to IPC/JEDEC J-STD-020E
* In order to reduce residual stress on the sensor component, the recommended
ramp-down temperature slope should be lower than 3°C /s.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 36
Package thickness
Time
Temperature
T
p
t
p
t
L
t
S
T
s max
T
s min
TC –5°C
T
L
25
Time 25°C to Peak
Preheat Area
Max. Ramp Up Rate
Max. Ramp Down Rate
Volume mm
<350
3
Volume mm
350-2000
3
Volume mm
3
>2000
< 1.6mm 260°C 260°C 260°C
1.6mm - 2.5mm 260°C 250°C 245°C
> 2.5mm 250°C 245°C 245°C
Table 13: Package classification reflow temperature, PB-free assembly, Note: refer to IPC/-
JEDEC J-STD-020E
It is recommended to solder the sensor on the last re-flow cycle of the PCB. For solder paste
use a LFM-48W or Indium based SAC 305 alloy (Sn 96.5 / Ag 3.0 / Cu 0.5 / Indium 8.9HF /
Type 3 / 89%) type 3 or higher.
The reflow profile must be adjusted based on the thermal mass of the entire populated PCB,
heat transfer efficiency of the re-flow oven and the specific type of solder paste used. Based
on the specific process and PCB layout the optimal soldering profile must be adjusted and
verified. Other soldering methods (e.g. vapor phase) have not been verified and have to be
validated by the customer at their own risk. Rework is not recommended.
Figure 16: Reflow soldering profile
After reflow soldering, visually inspect the board to confirm proper alignment
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 37
12.2.2 Cleaning and washing
Do not clean the product. Any residue cannot be easily removed by washing. Use a "no
clean" soldering paste and do not clean the board after soldering.
• Washing agents used during the production to clean the customer application might
damage or change the characteristics of the component. Washing agents may have a
negative effect on the long-term functionality of the product.
• Using a brush during the cleaning process may damage the component. Therefore,
we do not recommend using a brush during the PCB cleaning process
12.2.3 Potting and coating
• Potting material might shrink or expand during and after hardening. This might apply mechanical stress on the components, which can influence the characteristics of
the transfer function. In addition, potting material can close existing openings in the
housing. This can lead to a malfunction of the component. Thus, potting is not recommended.
• Conformal coating may affect the product performance. We do not recommend coating
the components.
12.2.4 Storage conditions
• A storage of Würth Elektronik eiSos products for longer than 12 months is not recommended. Within other effects, the terminals may suffer degradation, resulting in
bad solderability. Therefore, all products shall be used within the period of 12 months
based on the day of shipment.
• Do not expose the components to direct sunlight.
• The storage conditions in the original packaging are defined according to
DIN EN 61760 - 2.
• For a moisture sensitive component, the storage condition in the original packaging
is defined according to IPC/JEDEC-J-STD-033. It is also recommended to return the
component to the original moisture proof bag and reseal the moisture proof bag again.
12.2.5 Handling
• Violation of the technical product specifications such as exceeding the nominal rated
supply voltage, will void the warranty.
• Violation of the technical product specifications such as but not limited to exceeding
the absolute maximum ratings will void the conformance to regulatory requirements.
• ESD prevention methods need to be followed for manual handling and processing by
machinery.
• The edge castellation is designed and made for prototyping, i.e. hand soldering purposes only.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 38
• The applicable country regulations and specific environmental regulations must be observed.
• Do not disassemble the product. Evidence of tampering will void the warranty.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 39
13 Important notes
The following conditions apply to all goods within the sensors product range of Würth Elektronik eiSos GmbH & Co. KG:
13.1 General customer responsibility
Some goods within the product range of Würth Elektronik eiSos GmbH & Co. KG contain
statements regarding general suitability for certain application areas. These statements
about suitability are based on our knowledge and experience of typical requirements concerning the areas, serve as general guidance and cannot be estimated as binding statements
about the suitability for a customer application. The responsibility for the applicability and use
in a particular customer design is always solely within the authority of the customer. Due to
this fact, it is up to the customer to evaluate, where appropriate to investigate and to decide
whether the device with the specific product characteristics described in the product specification is valid and suitable for the respective customer application or not. Accordingly, the
customer is cautioned to verify that the documentation is current before placing orders.
13.2 Customer responsibility related to specific, in particular
safety-relevant applications
It has to be clearly pointed out that the possibility of a malfunction of electronic components
or failure before the end of the usual lifetime cannot be completely eliminated in the current
state of the art, even if the products are operated within the range of the specifications.
The same statement is valid for all software and software parts contained in or used with
or for products in the sensor product range of Würth Elektronik eiSos GmbH & Co. KG.
In certain customer applications requiring a high level of safety and especially in customer
applications in which the malfunction or failure of an electronic component could endanger
human life or health, it must be ensured by most advanced technological aid of suitable
design of the customer application that no injury or damage is caused to third parties in the
event of malfunction or failure of an electronic component.
13.3 Best care and attention
Any product-specific data sheets, manuals, application notes, PCN’s, warnings and cautions must be strictly observed in the most recent versions and matching to the products
revisions. This documents can be downloaded from the product specific sections on the
wireless connectivity and sensors homepage.
13.4 Customer support for product specifications
Some products within the product range may contain substances, which are subject to restrictions in certain jurisdictions in order to serve specific technical requirements. Necessary
information is available on request. In this case, the field sales engineer or the internal sales
person in charge should be contacted who will be happy to support in this matter.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 40
13.5 Product improvements
Due to constant product improvement, product specifications may change from time to time.
As a standard reporting procedure of the Product Change Notification (PCN) according to
the JEDEC-Standard, we inform about major changes. In case of further queries regarding
the PCN, the field sales engineer, the internal sales person or the technical support team in
charge should be contacted. The basic responsibility of the customer as per section
and
13.2
remains unaffected.
The sensor driver software ¨Sensor SDK¨ and it’s source codes are not subject to the Product Change Notification information process.
13.1
13.6 Product life cycle
Due to technical progress and economical evaluation we also reserve the right to discontinue production and delivery of products. As a standard reporting procedure of the Product
Termination Notification (PTN) according to the JEDEC-Standard we will inform at an early
stage about inevitable product discontinuance. According to this, we cannot ensure that all
products within our product range will always be available. Therefore, it needs to be verified
with the field sales engineer or the internal sales person in charge about the current product
availability expectancy before or when the product for application design-in disposal is considered. The approach named above does not apply in the case of individual agreements
deviating from the foregoing for customer-specific products.
13.7 Property rights
All the rights for contractual products produced by Würth Elektronik eiSos GmbH & Co. KG
on the basis of ideas, development contracts as well as models or templates that are subject
to copyright, patent or commercial protection supplied to the customer will remain with Würth
Elektronik eiSos GmbH & Co. KG. Würth Elektronik eiSos GmbH & Co. KG does not warrant
or represent that any license, either expressed or implied, is granted under any patent right,
copyright, mask work right, or other intellectual property right relating to any combination,
application, or process in which Würth Elektronik eiSos GmbH & Co. KG components or
services are used.
13.8 General terms and conditions
Unless otherwise agreed in individual contracts, all orders are subject to the current version of the "General Terms and Conditions of Würth Elektronik eiSos Group", last version
available at www.we-online.com.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 41
14 Legal notice
14.1 Exclusion of liability
Würth Elektronik eiSos GmbH & Co. KG considers the information in this document to be
correct at the time of publication. However, Würth Elektronik eiSos GmbH & Co. KG reserves the right to modify the information such as technical specifications or functions of
its products or discontinue the production of these products or the support of one of these
products without any written announcement or notification to customers. The customer must
make sure that the information used corresponds to the latest published information. Würth
Elektronik eiSos GmbH & Co. KG does not assume any liability for the use of its products.
Würth Elektronik eiSos GmbH & Co. KG does not grant licenses for its patent rights or for
any other of its intellectual property rights or third-party rights.
Notwithstanding anything above, Würth Elektronik eiSos GmbH & Co. KG makes no representations and/or warranties of any kind for the provided information related to their accuracy,
correctness, completeness, usage of the products and/or usability for customer applications.
Information published by Würth Elektronik eiSos GmbH & Co. KG regarding third-party products or services does not constitute a license to use such products or services or a warranty
or endorsement thereof.
14.2 Suitability in customer applications
The customer bears the responsibility for compliance of systems or units, in which Würth
Elektronik eiSos GmbH & Co. KG products are integrated, with applicable legal regulations.
Customer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements concerning its products, and any use of
Würth Elektronik eiSos GmbH & Co. KG components in its applications, notwithstanding
any applications-related in-formation or support that may be provided by Würth Elektronik eiSos GmbH & Co. KG. Customer represents and agrees that it has all the necessary
expertise to create and implement safeguards which anticipate dangerous consequences of
failures, monitor failures and their consequences lessen the likelihood of failures that might
cause harm and take appropriate remedial actions. The customer will fully indemnify Würth
Elektronik eiSos GmbH & Co. KG and its representatives against any damages arising out
of the use of any Würth Elektronik eiSos GmbH & Co. KG components in safety-critical
applications.
14.3 Usage restriction
Würth Elektronik eiSos GmbH & Co. KG products have been designed and developed for
usage in general electronic equipment only. This product is not authorized for use in equipment where a higher safety standard and reliability standard is especially required or where
a failure of the product is reasonably expected to cause severe personal injury or death,
unless the parties have executed an agreement specifically governing such use. Moreover,
Würth Elektronik eiSos GmbH & Co. KG products are neither designed nor intended for use
in areas such as military, aerospace, aviation, nuclear control, submarine, transportation
(automotive control, train control, ship control), transportation signal, disaster prevention,
medical, public information network etc. Würth Elektronik eiSos GmbH & Co. KG must be
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 42
informed about the intent of such usage before the design-in stage. In addition, sufficient
reliability evaluation checks for safety must be performed on every electronic component,
which is used in electrical circuits that require high safety and reliability function or performance. By using Würth Elektronik eiSos GmbH & Co. KG products, the customer agrees to
these terms and conditions.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 43
15 License terms for Würth Elektronik eiSos
GmbH & Co. KG sensor product software and source
code
This License terms will take effect upon the purchase and usage of the Würth Elektronik
eiSos GmbH & Co. KG sensor products. You hereby agree that this license terms are applicable to the product and the incorporated software, firmware and source codes (collectively,
"Software") made available by Würth Elektronik eiSos in any form, including but not limited
to binary, executable or source code form.
The software included in any Würth Elektronik eiSos sensor product is purchased to you on
the condition that you accept the terms and conditions of this license terms. You agree to
comply with all provisions under this license terms.
15.1 Limited license
Würth Elektronik eiSos hereby grants you a limited, non-exclusive, non-transferable and
royalty-free license to use the software and under the conditions that will be set forth in this
license terms. You are free to use the provided software only in connection with one of the
products from Würth Elektronik eiSos to the extent described in this license terms.
You are entitled to change or alter the source code for the sole purpose of creating an application embedding the Würth Elektronik eiSos sensor product. The transfer of the source
code to third parties is allowed to the sole extent that the source code is used by such third
parties in connection with our product or another hardware provided by Würth Elektronik
eiSos under strict adherence of this license terms. Würth Elektronik eiSos will not assume
any liability for the usage of the incorporated software and the source code.
You are not entitled to transfer the source code in any form to third parties without prior written consent of Würth Elektronik eiSos.
You are not allowed to reproduce, translate, reverse engineer, decompile, disassemble or
create derivative works of the incorporated software and the source code in whole or in part.
No more extensive rights to use and exploit the products are granted to you.
15.2 Usage and obligations
The responsibility for the applicability and use of the Würth Elektronik eiSos sensor product
with the incorporated software in a particular customer design is always solely within the
authority of the customer. Due to this fact, it is up to you to evaluate and investigate, where
appropriate, and to decide whether the device with the specific product characteristics described in the product specification is valid and suitable for your respective application or
not.
You are responsible for using the Würth Elektronik eiSos sensor product with the incorporated software in compliance with all applicable product liability and product safety laws. You
acknowledge to minimize the risk of loss and harm to individuals and bear the risk for failure
leading to personal injury or death due to your usage of the product.
Würth Elektronik eiSos’ products are not authorized for use in safety-critical applications,
or where a failure of the product is reasonably expected to cause severe personal injury
or death. Moreover, Würth Elektronik eiSos’ products are neither designed nor intended for
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 44
use in areas such as military, aerospace, aviation, nuclear control, submarine, transportation
(automotive control, train control, ship control), transportation signal, disaster prevention,
medical, public information network etc. You shall inform Würth Elektronik eiSos about the
intent of such usage before design-in stage. In certain customer applications requiring a very
high level of safety and in which the malfunction or failure of an electronic component could
endanger human life or health, you must ensure to have all necessary expertise in the safety
and regulatory ramifications of your applications. You acknowledge and agree that you are
solely responsible for all legal, regulatory and safety-related requirements concerning your
products and any use of Würth Elektronik eiSos’ products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by
Würth Elektronik eiSos. YOU SHALL INDEMNIFY WÜRTH ELEKTRONIK EISOS AGAINST
ANY DAMAGES ARISING OUT OF THE USE OF WÜRTH ELEKTRONIK EISOS’ PRODUCTS IN SUCH SAFETY-CRITICAL APPLICATIONS.
15.3 Ownership
The incorporated Software created by Würth Elektronik eiSos is and will remain the exclusive
property of Würth Elektronik eiSos.
15.4 Disclaimer of warranty
THE SOFTWARE AND IT’S SOURCE CODE IS PROVIDED "AS IS". YOU ACKNOWLEDGE THAT WÜRTH ELEKTRONIK EISOS MAKES NO REPRESENTATIONS AND WARRANTIES OF ANY KIND RELATED TO, BUT NOT LIMITED TO THE NON-INFRINGEMENT
OF THIRD PARTIES’ INTELLECTUAL PROPERTY RIGHTS OR THE MERCHANTABILITY OR FITNESS FOR YOUR INTENDED PURPOSE OR USAGE. WÜRTH ELEKTRONIK
EISOS DOES NOT WARRANT OR REPRESENT THAT ANY LICENSE, EITHER EXPRESS
OR IMPLIED, IS GRANTED UNDER ANY PATENT RIGHT, COPYRIGHT, MASK WORK
RIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT RELATING TO ANY COMBINATION, MACHINE, OR PROCESS IN WHICH THE WÜRTH ELEKTRONIK EISOS’ PRODUCT WITH THE INCORPORATED SOFTWARE IS USED. INFORMATION PUBLISHED BY
WÜRTH ELEKTRONIK EISOS REGARDING THIRD-PARTY PRODUCTS OR SERVICES
DOES NOT CONSTITUTE A LICENSE FROM WÜRTH ELEKTRONIK EISOS TO USE
SUCH PRODUCTS OR SERVICES OR A WARRANTY OR ENDORSEMENT THEREOF.
15.5 Limitation of liability
Any liability not expressly provided by Würth Elektronik eiSos shall be disclaimed.
You agree to hold us harmless from any third-party claims related to your usage of the Würth
Elektronik eiSos’ products with the incorporated software and source code. Würth Elektronik
eiSos disclaims any liability for any alteration, development created by you or your customers
as well as for any combination with other products.
15.6 Applicable law and jurisdiction
Applicable law to this license terms shall be the laws of the Federal Republic of Germany.
Any dispute, claim or controversy arising out of or relating to this license terms shall be
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 45
resolved and finally settled by the court competent for the location of Würth Elektronik eiSos
registered office.
15.7 Severability clause
If a provision of this license terms are or becomes invalid, unenforceable or null and void,
this shall not affect the remaining provisions of the terms. The parties shall replace any such
provisions with new valid provisions that most closely approximate the purpose of the terms.
15.8 Miscellaneous
Würth Elektronik eiSos reserves the right at any time to change this terms at its own discretion. It is your responsibility to check at Würth Elektronik eiSos homepage for any updates.
Your continued usage of the products will be deemed as the acceptance of the change.
We recommend you to be updated about the status of new software, which is available on
our website or in our data sheet, and to implement new software in your device where appropriate.
By ordering a sensor product, you accept this license terms in all terms.
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 46
List of Figures
1 Pin specifications (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Master-slave concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 SDA and SCL logic levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Data validity, START and STOP condition . . . . . . . . . . . . . . . . . . . . 12
5 Complete data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Write and read operations with the device . . . . . . . . . . . . . . . . . . . . 15
7 Application circuit with I2C interface (sensor bottom view) . . . . . . . . . . . 17
8 Communication check between host controller and the sensor . . . . . . . . . 18
9 Sensor operation: single-conversion mode . . . . . . . . . . . . . . . . . . . . 19
10 Sensor operation: continuous mode . . . . . . . . . . . . . . . . . . . . . . . 20
11 Application circuit with I2C interface (sensor bottom view) . . . . . . . . . . . 22
12 Reading temperature data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
13 Interrupt output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
14 Sensor dimensions [mm] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
15 Recommended land pattern [mm] (top view) . . . . . . . . . . . . . . . . . . . 35
16 Reflow soldering profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
List of Tables
1 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Temperature sensor specifications . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Slave address and Read/Write commands . . . . . . . . . . . . . . . . . . . . 13
8 I2C timing parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9 Output data rate selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
10 Temperature threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
11 Output data rate selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
12 Classification reflow soldering profile, Note: refer to IPC/JEDEC J-STD-020E 36
13 Package classification reflow temperature, PB-free assembly, Note: refer to
IPC/JEDEC J-STD-020E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Temperature Sensor IC, Part Nr. 2521020222501
User manual version 1.0 © February 2020
www.we-online.com/sensors 47
Monitoring
& Control
Automated Meter
Reading
Internet
of Things
more than you expect
Contact:
Würth Elektronik eiSos GmbH & Co. KG
Division Wireless Connectivity & Sensors
Max-Eyth-Straße 1
74638 Waldenburg
Germany
Tel.: +49 651 99355-0
Fax.: +49 651 99355-69
www.we-online.com/wireless-connectivity
Loading...