KAmodLM75A

Description

KAmodLM75A is a module with NXP LM75A temperature sensor. The board is equipped with a Pmod I2C standard connector and a KAMAMI connector, allowing easy attachment of the module to development kits. Due to its small dimensions, the product can be used in many development projects, while the Pmod through connector allows the boards to be connected in series.

Basic features

• LM75A chip from NXP
  • I2C bus interface with up to 8 devices on the same bus (address configuration via jumpers)
  • Temperature measurement in the range from -55 °C to +125 °C
  • 11-bit ADC with a resolution of 0.125 °C
  • Temperature measurement accuracy:
    • ± 2 ° C from -25 °C to +100 °C
    • ± 3 ° C from -55 °C to +125 °C
  • Programmable temperature thresholds and hysteresis setpoints
  • 3.5 µA power supply in off mode to save power
  • Independent work as a thermostat when switching on
  • Protection against electrostatic discharge
• Through connector compatible with the Pmod standard, allows for serial connection of Pmod I2C modules
• Connector compatible with the KAMAMI standard
• Embedded jumpers enabling pull-up on I2C bus lines
• Supply range from 2.8 V to 5.5 V
• Mounting holes with a diameter of 2.5 mm
• Dimensions: 61.2 mm x 20.3 mm x 10 mm

Standard equipment

Code	Description
KAmodLM75A	Assembled and launched module

Schematic

Output description - Pmod standard connector

	JP1 (male connector)	JP2 (female connector)	Function
	VDD	VDD	Power supply of module (max. 5.5 V)
	GND	GND
	SDA	SDA	Data line of I2C bus
	SCL	SCL	Clock line of I2C bus
	RST	RST	-
	INT	INT	OS interrupt

Output description – KAMAMI standard connector

	Pin number	Function
	1 (VDD_5V)	Power supply of module (max. 5,5 V)
	2 (SCL)	Clock line of I2C bus
	3 (SDA)	Data line of I2C bus
	4 (GND)	Ground

I2C bus lines

The KAmodLM75A module is equipped with jumpers enabling the connection of pull-up resistors to the VCC power pole to the I2C bus line. The jumpers give the possibility of independent enabled of the pull-up for the SDA and SCL lines.

OS interrupt line

The KAmodLM75A module is equipped with a jumper to connect the OS interrupt output line (Overtemperature Shutdown) to the connector compatible with the Pmod standard. Thanks to the ability to disconnect the KAmodLM75A interrupt line from the Pmod connectors, the user does not have to worry about the consequences of any conflicts arising from connecting modules compatible with Pmod with different logic states. The OS output is for thermal interruption. After switching on the device, the output is only activated first if the temperature exceeds the limit temperature. The state remains active until it is reset by reading the register.

Configuration of the I2C bus address

The KAmodLM75A module has the option of configuring the I2C bus address in the range from 0x48 to 0x4F. Configuration of the address is done by means of three jumpers located on the module board.

Dimensions

External links

• LM75A datasheet