SinoVoip Banana Pi LM75 User manual

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
LM75 Temperature Sensor Module

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
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Attention:
Due to technical requirements components, please do
not hand directly connected
Touch. Core board and development system contains
static-sensitive devices. Quiet Electrical charge easily
accumulate in the human body and the device can not
detect possible Damage to equipment, it is
recommended to take anti-static measures, it is
recommended not to hand. Touch, stored in anti-static
effect devices.

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
Banana Pi Expand Module Serial：
Infinity cascade IO expand module：
This module is designed specifically for the Banana Pi IO expansion modules. The
module expand 32 IO, Multiple modules can cascade, infinity cascade，infinity GPIO.
I2C GPIO expand module：
This module is designed specifically for the Banana Pi IO expansion modules. The
Module use I2C bus to connect to Banana Pi. The module expand 8 Bidirectional
GPIO and wit isolation protection function which can effectively excessive external
voltage. There are 8 I2C address, you can choose one of them through setup the
jumper. Multiple modules can cascade and maximum cascade 8 modules!
Prototype development module：
The Prototype development module is designed specifically for the Banana Pi. The
module suitable enthusiasts and user can weld peripheral to the module；The
module expand some amphenol connector and some SMT, so the user can finish
prototype test easily.
Berryclip expand module：
The BerryClip module is designed specifically for learning how to use the GPIO of
Banana Pi. There are 6 multiple color LED, 1 button and 1 Buzzer on the module.
Berryclip(DIY) expand module：
The module is not the end product, you need weld them by yourself. The function of
the module is the same as BerryClip module.
UNO compatibility module：
The module makes Banana Pi compatible with Arduino Uno and many Arduino
Shields. The module’s GPIO is the same as Arduino Uno and you can choose the
voltage of GPIO between 5V or 3V through setup jumper.
T Electric level convert module：
The module expand the GPIO of Banana Pi to breadboard. It convert 3.3V electric to
5V electric level, then the Banana Pi can connect many 5V electric level peripheral.
IO extraction module：
The module expand all of GPIO of Banana Pi to breadboard.

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
Product Specification
Product Overview：
This module is designed specifically for the Banana Pi. The module use the NXP LM75
Temperature chip. The temperature register always stores an 11-bit 2's complement
data giving atemperature resolution of 0.125°C. The module use I2C bus to connect
to Banana PI.

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
Product Feature：
11bit high resolution ADC in chip
temperature resolution of 0.125°C.
Connect through I2C bus
Port：
BananaPi insert port
Product Parameters：
Working voltage: 2.8V-5.5V
Temperatures range from−55°C to +125°C
Supply current of 3.5µA in shutdown mode for power conservation
Temperature accuracy of: ±2°C from−25°C to +100°C
Temperature accuracy of: ±3°C from−55°C to +125°C
Typical Application：
Industrial controllers
Environmental monitoring
Smart home
Interactive devices
How to use：
Insert the temperature sensor module to the Banana Pi, Pay attention don’t
make the direction reversed! The correct direction of insert module is above the
Banana Pi’s PCB, just like the below picture. Then, power up the Banana Pi, open the
terminal use the command “ dmesg | grep “lm75” ” to check the module. If the
module have been recognized the terminal will show “ lm75 1-0048: hwmon0:
sensor 'lm75' ”

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
More information：
The LM75A is a temperature-to-digital converter using an on-chip band gap
temperature sensor and Sigma-delta A-to-D conversion technique. The device is also
a thermal detector providing an overtemperature detection output. The LM75A
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.
Temperature register (Temp) to store the digital temp reading, and set-point registers
(Tos and Thyst) to store programmable over temperature shutdown and hysteresis
limits, that can be communicated by a controller via the 2-wire serial I2C-bus
interface. The device also includes an open-drain output (OS) which becomes active
when the temperature exceeds the programmed limits. There are three selectable
logic address pins so that eight devices can be connected on the same bus without
address conflict.
The temperature register always stores an 11-bit 2'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. The device
is powered-up in 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

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
stand-alone thermostat with those pre-defined temperature set points.
OS response to temperature：

Hardware manual
www.banana-pi.com Temperature Sensor Module Datesheet
Schematic diagram：
More information please check：
http://www.nxp.com/products/sensors/i2c_temperature_voltage_monitors/series
/LM75A.html
Testbench：
Install i2c-tools: sudo apt-get install i2c-tools
Read the device address: sudo i2cdetect –y –a 1
If the address is 0x48, the module has running