Achieve reliable thermo data storage with SE97B and STM32G474RE
Temperature records, your way
Published Nov 08, 2024
Click board™
Temp-Log 4 Click
Dev Board
Nucleo 64 with STM32G474RE MCU
Compiler
NECTO Studio
MCU
STM32G474RE
Customize and access your temperature records effortlessly with our solution's built-in EEPROM memory, designed to meet your unique requirements.
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Hardware Overview
How does it work?
Temp-Log 4 Click is based on the SE97B, a temperature sensor with integrated EEPROM from NXP. This IC is used to convert the temperature measurement into digital information. Besides the thermal sensor, this IC also features 256 bytes of EEPROM on the same die. It is compliant with the JEDEC specification JC42.4-TSE2002B1 since it is designed specifically for DRAM DIMMs (Dual In-line Memory Modules), allowing the Serial Presence Detect (SPD) feature. However, it is not limited to this role only: it can be used as a very accurate general-purpose thermometer with the added benefit of integrated EEPROM, reducing the number of physical ICs required to design a temperature logging application. Temp-Log 4 click utilizes the I2C serial interface (SMBus compatible), which allows it to be used in a wide range of applications. The temperature sensor section includes all the features typically found on such ICs. The band gap thermal sensor is sampled by a 11-bit delta-sigma A/D converter. It is sampled about 10 times per second, and the thermal value is placed on the double-buffered output register. This prevents data corruption if access to the output registry is attempted during the conversion
process. The specified accuracy of the temperature sensor is typically ±2 °C in the range from -40 °C to +125 °C, further improving near the operating temperature of DIMM, within the range between +40 °C to +125 °C. The SE97B IC features the CAPABILITY register. This register is a read-only register and it provides some general information, such as the factory-specified accuracy in the upper-temperature range (+75°C to +95°C and +40°C to +125°C), measurement range, resolution, and other parameters of the sensor. Its description, along with the description of other registers, can be found in the SE97B IC datasheet. The SE97B IC is fully configurable. It contains a set of registers for configuring the thermal sensor, the upper and the lower thermal limit, as well as the critical temperature. This IC features a very usable interrupt engine, designed mainly to support SPD functionality, but it can be utilized for much wider range of applications. The #EVENT pin is an open-drain, active-LOW pin used to alert the host microcontroller (MCU) or some other circuit, whether the programmed thresholds have been exceeded, or a critical temperature level has been reached. The SE97B
allows two EVENT modes: the interrupt mode, and the comparator mode. The interrupt mode can be used in the embedded applications controlled by a MCU, while the comparator mode is used to directly control a circuit, since unlike the interrupt mode, it does not require the software to clear both the temperature and the EEPROM section have their own I2C address. The I2C address is determined by four fixed bit values, while the last three bits (LSBs) are determined by the logic states applied to A2, A1, and A0. While A0 and A1 address are hard-wired to a LOW logic level on this Click board™, the value of the A2 address bit can be changed by switching the SMD jumper labeled as ADDR SEL to either 0 (tied to GND) or 1 (tied to VCC). The datasheet of the SE97B offers a table with the content of these four bits for each section of the IC. Temp-Log 4 click uses the I2C communication interface. It has pull-up resistors connected to the mikroBUS™ 3.3V rail. A proper conversion of logic voltage levels should be applied before the Click board™ is used with MCUs operated with 5V.
Features overview
Development board
Nucleo-64 with STM32G474R MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin
headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is
provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M4
MCU Memory (KB)
512
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
128k
You complete me!
Accessories
Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Nucleo 64 with STM32G474RE MCU as your development board.
Track your results in real time
Application Output via Debug Mode
1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.
2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.
Software Support
Library Description
This library contains API for Temp-Log 4 Click driver.
Key functions:
templog4_write_reg- Generic Write function.templog4_read_reg- Generic Read function.templog4_set_addr_ptr- Set Address Pointer function.
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* \file
* \brief TempLog4 Click example
*
* # Description
* This application measures the temperature
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes I2C interface and performs a device configuration for properly working.
Also sets the temperature limit to the desired values.
*
* ## Application Task
* First ensures that the minimum conversion time is met, and then reads the
ambient temperature calculated to the Celsius degrees.
Also checks the limit status and shows a message when some limit condition is met.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "templog4.h"
// ------------------------------------------------------------------ VARIABLES
static templog4_t templog4;
static log_t logger;
static uint8_t ret_status;
// ------------------------------------------------------- ADDITIONAL FUNCTIONS
void static check_limit_status ( )
{
if ( ( ret_status & 0x80 ) != 0x00 )
{
log_printf( &logger, "** Critical temperature detection! **\r\n" );
}
if ( ( ret_status & 0x40) != 0x00 )
{
log_printf( &logger, "** Ambient temperature is higher than upper limit temperature! **\r\n" );
}
else if ( ( ret_status & 0x20) != 0x00 )
{
log_printf( &logger, "** Ambient temperature is lower than lower limit temperature! **\r\n" );
}
}
void static wait_conversion_done ( )
{
uint8_t time_cnt;
for ( time_cnt = 0; time_cnt < 13; time_cnt++ )
{
Delay_10ms( );
}
}
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( )
{
log_cfg_t log_cfg;
templog4_cfg_t cfg;
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
// Click initialization.
templog4_cfg_setup( &cfg );
TEMPLOG4_MAP_MIKROBUS( cfg, MIKROBUS_1 );
templog4_init( &templog4, &cfg );
templog4_default_cfg ( &templog4 );
}
void application_task ( )
{
float temperature;
wait_conversion_done( );
ret_status = templog4_get_temp( &templog4, TEMPLOG4_TEMP_AMBIENT_REG, &temperature );
log_printf( &logger, "** Ambient temperature: %f C **\r\n", temperature );
check_limit_status( );
log_printf( &logger, "\r\n", temperature );
Delay_ms( 300 );
}
void main ( )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
