Datasheet

DS1820 is a digital temperature
sensor that uses 1-wire®
interface for it’s operation. It is
capable of measuring temperatures
within the range of -55 to 128°C,
and provides ±0.5°C accuracy for
temperatures within the range of -10 to
85°C. It requires 3V to 5.5V power supply
for stable operation. It takes maximum
of 750ms for the DS1820 to calculate
temperature with 9-bit resolution. 1-wire®
serial communication enables data to be
transferred over a single communication
line, while the process itself is under the
control of the master microcontroller.
The advantage of such communication is
that only one microcontroller pin is used.
Multiple sensors can be connected on the
same line. All slave devices by default
have a unique ID code, which enables
the master device to easily identify all
devices sharing the same interface.
Board provides a separate socket (TS1)
for the DS1820. Communication line with
the microcontroller is established using
SW14.5 or SW14.6 DIP switch (ON
position).
DS1820 - Digital
Temperature Sensor
page 34
VCC-3.3V
C41
100nF
1 2
3 4 5 6 7 8
O
N
SW14
DS1820 PB10
PA3
DATA BUS
VCC-3.3V
R33
1K5
DQ
GND
VCC
EasyMx PRO
™
v7 for STM32 enables you to establish 1-wire® communication
between DS1820 and the microcontroller over PB10 or PA3 pin. The connection
is done placing SW14.5 or SW14.6 DIP switch to ON position (Figure 20-3).
When placing the sensor in the socket make sure that half-circle on the board’s
silkscreen markings matches the rounded part of the DS1820 sensor. If you
accidentally connect the sensor the other way, it may be permanently damaged.
Make sure to disconnect other peripherals, LEDs and additional pull-up or pull-
down resistors from the interface lines in order not to interfere with signal/data
integrity.
Figure 20-2:
DS1820 correctly
placed in socket
Figure 20-4: DS1820 connected to PB10 pin
Enabling DS1820 Sensor
other modules
EasyMx PRO
v7
Figure 20-1:
DS1820
socket
Figure 20-3:
Enabled SW14.5
DIP switch