This is an overview of the CHS-MSS and the OSS-ECAL offering for the CHS-MSS. The CHS-MSS is a Humidity sensor IC (20%RH to 85%RH) made by TDK.
MCU interface : ADC
CAUTION:The original language of this resource is Japanese. The translations are provided as a convenience and may be machine-translated, and we make no warranties as to the accuracy or adequacy of the translations. Please refer to the latest version of the Datasheet prior to actual design, etc.
CHS-MSS
General description
TDK supplies high-precision humidity sensor elements made of our proprietary high-polymer materials and circuit-integrated humidity sensor assemblies based on our proprietary circuit design technology. The humidity sensor element is a high-sensitivity, high-precision, resistance-change type humidity sensor element made of our originally developed polymer material. It features high accuracy of ±5%RH, high sensitivity, compact size, high response, and low hysteresis characteristics. The humidity sensor assembly is a compact product with an integrated circuit, and its DC power supply drive and DC voltage output make it easy to use and control. The screw-mount type can be easily installed at the detection point. It features a wide humidity detection range (5 to 95(%)RH), high humidity detection accuracy (±3%RH to ±7%RH), and low hysteresis characteristics. It can be used for a wide range of applications such as printers, refrigerators (humidity control for outside storage/vegetable compartment), air conditioners (humidity control inside the room), and air conditioning equipment for plant factories.
Feature
- A wide range of humidity from 5 to 95(%)RH can be measured
- High accuracy. In particular, the nominal accuracy of CHS-UPR and -UPS is ±3(%)RH or less
- Temperature characteristics are flat over a wide range
- There is almost no hysteresis in moisture sensitivity characteristics
- Compact, can be installed in any location, and offers excellent cost performance
- Low current consumption
- DC.1V output displays 100(%)RH, and the relative humidity can be read directly by the voltmeter
- All-in-one construction integrates all necessary circuits and operates by simply connecting a power supply (5 V)
Application
- Refrigerator (condensation prevention)
- Air conditioning (indoor humidity control)
- PPC, LBP (image quality control)
- Industrial electronic humidity meters, air conditioning equipment for plant factories, etc.
OSS-ECAL specification
API Function
etSTS oCHS_MSS( etCMD cmd, float32* rlt )
The oCHS_MSS function is an API function that executes CHS-MSS processing according to the command in the argument.
| Return value | etSTS | OSS-ECAL status code | |
| eSTS_FIN | Completed successfully | ||
| eSTS_ERR_MIN | Minimum Humidity error (rlt is minimum Humidity) | ||
| eSTS_ERR_MAX | Maximum Humidity error (rlt is maximum Humidity) | ||
| eSTS_ERR_HAL_ADC | HAL ADC Error | ||
| eSTS_ERR_COMMAND_CODE | Command selection error | ||
| eSTS_ERR_OTHERS_RUN | Other components are executing the process | ||
| eSTS_ERR_HAL_OTHERS_RUN | Other application is running HAL | ||
| eSTS_ERR_ADC_OBJECT | AD conversion object selection error | ||
| Parameter IN | etCMD cmd | OSS-ECAL command code | |
| eCMD_START | Command to start AD conversion. | ||
| eCMD_READ | Command that reads the AD conversion value, converts the AD conversion value to a characteristic Humidity, and stores the Humidity in rlt. AD conversion value to Humidity conversion equation Voltage value = (AD conversion value × VDD) / ( 2AD bit ) Humidity = ((voltage value – voltage offset value) / gain) + Humidity offset value (Min, Max Limit) | ||
| eCMD_START_READ | Command that starts AD conversion, waits for AD conversion to finish, reads out the AD conversion value, converts the AD conversion value to a characteristic Humidity, and stores the Humidity in rlt. AD conversion value to Humidity conversion equation Voltage value = (AD conversion value × VDD) / ( 2AD bit ) Humidity = ((voltage value – voltage offset value) / gain) + Humidity offset value (Min, Max Limit) | ||
| Parameter OUT | float32* rlt | Humidity 20.0 to 85.0 [%RH] |
Command Correspondence Table by HAL
| Arduino | eCMD_START_READ |
| ARM Mbed | eCMD_START_READ |
| Infineon ModusToolbox | eCMD_START_READ |
| NXP MCUXpresso iMXRT1051B_1052B | eCMD_START eCMD_READ eCMD_START_READ |
| Renesas SSP | eCMD_START eCMD_READ eCMD_START_READ |
| STM STM32Cube FW_F4 | eCMD_START eCMD_READ eCMD_START_READ |
etSTS oCHS_MSS_START(void)
The oCHS_MSS_START function is an API function to start AD conversion of the CHS-MSS.
| Return value | etSTS | OSS-ECAL status code | |
| eSTS_FIN | Completed successfully | ||
| eSTS_ERR_HAL_ADC | HAL ADC Error | ||
| eSTS_ERR_OTHERS_RUN | Other components are executing the process | ||
| eSTS_ERR_HAL_OTHERS_RUN | Other application is running HAL | ||
| eSTS_ERR_ADC_OBJECT | AD conversion object selection error |
Function Correspondence Table by HAL
| Arduino | – |
| ARM Mbed | – |
| Infineon ModusToolbox | – |
| NXP MCUXpresso iMXRT1051B_1052B | X |
| Renesas SSP | X |
| STM STM32Cube FW_F4 | X |
etSTS oCHS_MSS_READ( float32* rlt )
The oCHS_MSS_READ function is an API function that checks for the end of AD conversion of the CHS-MSS, reads the AD conversion value, converts the AD conversion value to a characteristic Humidity, and stores the Humidity in rlt.
AD conversion value to Humidity conversion equation
Voltage value = (AD conversion value × VDD) / ( 2AD bit )
Humidity = ((voltage value – voltage offset value) / gain) + Humidity offset value (Min, Max Limit)
| Return value | etSTS | OSS-ECAL status code | |
| eSTS_FIN | Completed successfully | ||
| eSTS_ERR_MIN | Minimum Humidity error (rlt is minimum Humidity ) | ||
| eSTS_ERR_MAX | Maximum Humidity error (rlt is maximum Humidity ) | ||
| eSTS_ERR_HAL_ADC | HAL ADC Error | ||
| eSTS_ERR_TIMEOUT | ADC Timeout error (AUTOSAR only) | ||
| eSTS_ERR_OTHERS_RUN | Other components are executing the process | ||
| eSTS_ERR_ADC_OBJECT | AD conversion object selection error | ||
| Parameter OUT | float32* rlt | Humidity 20.0 to 85.0 [%RH] |
Function Correspondence Table by HAL
| Arduino | – | |
| ARM Mbed | – | |
| Infineon ModusToolbox | – | |
| NXP MCUXpresso iMXRT1051B_1052B | X | |
| Renesas SSP | X | |
| STM STM32Cube FW_F4 | X | Time-out time HAL_MAX_DELAY |
etSTS oCHS_MSS_START_READ( float32* rlt )
The oCHS_MSS_START_READ function is an API function that starts an AD conversion of the CHS-MSS, waits for the AD conversion to finish, reads the AD conversion value, converts the AD conversion value to a Humidity characteristic, and stores the Humidity in rlt.
AD conversion value to Humidity conversion equation
Voltage value = (AD conversion value × VDD) / ( 2AD bit )
Humidity = ((voltage value – voltage offset value) / gain) + Humidity offset value (Min, Max Limit)
| Return value | etSTS | OSS-ECAL status code | |
| eSTS_FIN | Completed successfully | ||
| eSTS_ERR_MIN | Minimum Humidity error (rlt is minimum Humidity) | ||
| eSTS_ERR_MAX | Maximum Humidity error (rlt is maximum Humidity) | ||
| eSTS_ERR_HAL_ADC | HAL ADC Error | ||
| eSTS_ERR_OTHERS_RUN | Other components are executing the process | ||
| eSTS_ERR_HAL_OTHERS_RUN | Other application is running HAL | ||
| eSTS_ERR_ADC_OBJECT | AD conversion object selection error | ||
| Parameter OUT | float32* rlt | Humidity 20.0 to 85.0 [%RH] |
Function Correspondence Table by HAL
| Arduino | X | |
| ARM Mbed | X | |
| Infineon ModusToolbox | X | |
| NXP MCUXpresso iMXRT1051B_1052B | X | |
| Renesas SSP | X | |
| STM STM32Cube FW_F4 | X | Time-out time HAL_MAX_DELAY |
HAL Support List
OSS-ECAL’s HAL support is as follows. (The list is being expanded sequentially.) Please note that even if the same HAL is used, different versions, MCUs, and development environments may not work together.
| Manufacturer | SDK/IDE Tool | HAL Name | Ver | HALNAME | Support |
|---|---|---|---|---|---|
| Arduino | Arduino IDE | Arduino | 1.8.6 | ARDUINO | X |
| Arm | Keil MDK v6 | Mbed OS | 6.17.0 | MBED | X |
| Debian | – | GNU/Linux | 10.3 | Linux | – |
| Infineon | ModusToolbox | mtb-hal-cat1 | 2.4.3 | ModusToolbox | X |
| NXP | MCUXpresso SDK | SDK_2.x_EVKB-IMXRT1050 | 2.16 | iMXRT1051B1052B | X |
| NXP | PlatformSDK_S32K1_2022_02 | AUTOSAR MCAL | 4.4 | MCAL | – |
| Renesas | Synergy Software Package | HAL | 2.6.0 | SSP | X |
| STMicroelectronics | STM32Cube | STM32CubeF4 | V1.28.1 | STM32F4 | X |
Development environment
The MCU and development environment during OSS-ECAL development are as follows.
| HALNAME | Manufacturer | Board | MCU | IDE |
|---|---|---|---|---|
| ARDUINO | Arduino | 1.Mega 2560 Rev3 2.Arduino Pro Mini 3.3V | ATmega2560 ATmega328P | Arduino IDE 2.3.3 |
| MBED | STMicroelectronics | STM32 Nucleo-64 boards | STM32F401RETx | Arm Keil Studio Cloud |
| Linux | BeagleBoard | BeagleBone Black | TI AM335x | – |
| ModusToolbox | Infineon | CY8CPROTO-063-BLE PSoC 6 BLE Prototyping Kit | CYBLE-416045-02 | ModusToolbox |
| iMXRT1051B1052B | NXP | IMXRT1050-EVKB | i.MX RT1050 | MCUXpresso IDE |
| MCAL | STMicroelectronics | S32K144EVB-Q100 | S32K144 | S32 Design Studio for S32 Platform |
| SSP | Renesas | S7G2 SK | R7FS7G27H3A01CFC | e² studio for Renesas Synergy |
| STM32F4 | STMicroelectronics | STM32 Nucleo-64 boards | STM32F401RETx | STM32CubeIDE |
File Structure
| Folder* | File | Summary |
|---|---|---|
| CHS_MSS_HALNAME_VERSION/sample | sample.c (.cpp) | Sample Application Program |
| sample.h | Sample Application Header | |
| CHS_MSS_HALNAME_VERSION | oCHS_MSS.c (.cpp) | OSS-ECAL Program for CHS-MSS |
| oCHS_MSS.h | OSS-ECAL Header for CHS-MSS | |
| CHS_MSS_ARDUINO.ino | Sample application programs for Arduino | |
| oss_ecal.h | OSS-ECAL Common Header (Ver 01.00.00 or later) | |
| user_setting.c (.cpp) | Const and Table of User setting | |
| user_setting.h | Header of User setting | |
| readme.md | Readme | |
| OSS-ECAL Terms of Use.txt | OSS-ECAL Terms of Use |
* For HALNAME, please refer to HAL Support.
OSS-ECAL Download Contact
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Built-in How to
How to incorporate OSS-ECAL into user programs
How to incorporate multiple OSS-ECALs in a user program (same MCU function)
How to incorporate multiple OSS-ECALs in a user program (different MCU function)
How to incorporate multiple identical electronic components into a user program
How to reduce the impact on user programs by replacing electronic components
CAUTION
The sample version of OSS-ECAL is not intended to be used with Threads (Tasks) or interrupts of different priority. Please do not use it as in the example below.
Example: If each sensor is assigned to the same ADC group and the OSS-ECAL API is executed in processes with different priorities, correct values may not be obtained.
ADC Gr0 Ch0 Temperature sensor AD22100A 100ms cycle Thread (low priority) to take in temperature
ADC Gr0 Ch1 Pressure sensor MPX5999D Event interrupts (high priority) to take pressure