Temperature and humidity sensor chip with low power consumption

Abstract

The utility model provides a temperature and humidity sensor chip with low power consumption, which comprises a sensing element used for acquiring and converting temperature and humidity information, and further comprises an ADC (Analog to Digital Converter) module configured to be respectively connected with the sensing element and a digital module and used for converting an analog signal acquired by the sensing element into a digital signal and transmitting the digital signal to the digital module; the digital module is configured to be connected with an external host and used for controlling interaction between the digital module in the chip and the ADC module and communication between the digital module in the chip and the external host; and the power consumption management unit is configured to be respectively connected with the ADC module and the digital module and is used for respectively performing power consumption management on the ADC module and the digital module. According to the utility model, the power consumption management unit is added on the basic temperature and humidity sensor chip to manage the power consumption of each module so as to reduce the power consumption; meanwhile, the digital filtering module is added, digital filtering processing is carried out on temperature and humidity digital signals converted and transmitted by the ADC module, and the detection precision is improved.

Description

Technical Field

[0001] The utility model relates to the field of temperature and humidity sensors, in particular to a low-power consumption temperature and humidity sensor chip. Background Art

[0002] Temperature and humidity sensors mostly use integrated temperature and humidity probes as temperature measuring elements. The temperature and humidity signals are collected through chip calculations, and are converted into current signals or voltage signals that are linearly related to temperature and humidity after being processed by circuits such as voltage stabilization and filtering, operational amplification, nonlinear correction, V / I conversion, constant current and reverse protection. They can also be directly output through interfaces such as 485 or 232 through the main control chip.

[0003] Temperature and humidity sensors have been widely used in our daily life. In these application scenarios, batteries are the main power supply devices with limited power. Therefore, reducing the power consumption of temperature and humidity sensor chips can help reduce product energy consumption and extend battery life. They are more suitable for low-power application scenarios such as long-term monitoring. Utility Model Content

[0004] In order to solve the problems existing in the background technology, the utility model proposes a low-power consumption temperature and humidity sensor chip.

[0005] A low-power temperature and humidity sensor chip, comprising a sensor element for collecting and converting temperature and humidity information, and also comprising:

[0006] The ADC module is configured to be connected to the sensor element and the digital module respectively, and is used to convert the analog signal collected by the sensor element into a digital signal and transmit it to the digital module;

[0007] A digital module is configured to connect to an external host and is used to control the interaction between the digital module in the chip and the ADC module and the communication with the external host;

[0008] The power consumption management unit is configured to be connected to the ADC module and the digital module respectively, and is used to perform power consumption management on the ADC module and the digital module respectively.

[0009] Based on the above, the digital module includes a digital filter module, which is connected to the ADC module and performs digital filtering processing on the data transmitted by the ADC module.

[0010] Based on the above, the digital module includes an OTP control module, which is connected to the OTP storage module and is used to read the configuration information stored in the OTP storage module.

[0011] Based on the above, the digital module includes an IIC module, and the IIC module is respectively connected to the system control module in the digital module and the external host for interacting with the external host.

[0012] Based on the above, the digital module includes a system control module, which is respectively connected to the digital filter module, OTP control module, power management unit, on-chip low-frequency crystal oscillator, power-on reset module and IIC module to control the signal interaction and configuration between the modules.

[0013] Based on the above, it includes an on-chip low-frequency crystal oscillator configured to connect the system control module and the power consumption management unit. The on-chip low-frequency crystal oscillator is used to provide a clock signal, and the power consumption management unit is used to manage the power consumption of the on-chip low-frequency crystal oscillator.

[0014] Based on the above, a power-on reset module is included, which is configured to connect the system control module and the power consumption management unit. The power-on reset module is used to provide a reset signal, and the power consumption management unit is used to manage the power consumption of the power-on reset module.

[0015] Based on the above, an OTP storage module is included, which is configured to connect the OTP control module and the power consumption management unit. The OTP storage module is used to store the power-on configuration information of the chip, and the power consumption management unit is used to manage the power consumption of the OTP storage module.

[0016] Based on the above, the sensing element includes a temperature sensing element, which is configured to be connected to an ADC module for collecting and converting temperature information into an analog signal.

[0017] Based on the above, the sensing element includes a humidity sensing element, which is configured to be connected to an ADC module for collecting and converting humidity information into an analog signal.

[0018] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model adds a power consumption management unit to the basic temperature and humidity sensor chip to manage the power consumption of each module to reduce power consumption; at the same time, a digital filtering module is added to perform digital filtering processing on the temperature and humidity digital signals converted and transmitted by the ADC module, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the digital module of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1 As shown, a low-power temperature and humidity sensor chip includes a sensor element for collecting and converting temperature and humidity information. The sensor element includes a temperature sensor element and a humidity sensor element. The temperature sensor element and the humidity sensor element are respectively connected to an ADC module. The temperature sensor element is used to collect temperature information and convert the collected information into temperature information of an analog signal; the humidity sensor element is used to collect humidity information and convert the collected information into humidity information of an analog signal.

[0023] The temperature and humidity sensor chip also includes an ADC module, a digital module and a power management unit. The ADC module is connected to the temperature sensor element, the humidity sensor element and the digital module respectively. The ADC module receives the analog signals collected by the temperature sensor element and the humidity sensor element, converts them into digital signals and transmits them to the digital module. The digital module is connected to an external host to control the interaction between the digital module in the chip and the ADC module and the communication with the external host. The power management unit is connected to the ADC module and the digital module respectively to manage the power consumption of the ADC module and the digital module respectively.

[0024] In practice, the chip also includes a power-on reset module, an OTP (One Time Program) storage module and an on-chip low-frequency crystal oscillator. The power-on reset module is connected to the system control module and the power management unit. The power-on reset module is used to provide a reset signal. The power management unit is used to manage the power consumption of the power-on reset module. The OTP storage module is connected to the OTP control module and the power management unit. The OTP storage module is used to store the power-on configuration information of the chip. The power management unit is used to manage the power consumption of the OTP storage module. The on-chip low-frequency crystal oscillator is connected to the system control module and the power management unit. The on-chip low-frequency crystal oscillator is used to provide a clock signal. The power management unit is used to manage the power consumption of the on-chip low-frequency crystal oscillator.

[0025] Specifically, Figure 2As shown, the digital module includes a digital filter module, an OTP control module, an IIC (integrated circuit bus) module and a system control module. The digital filter module is connected to the ADC module to perform digital filtering on the data transmitted by the ADC module to improve the accuracy. The OTP control module is connected to the OTP storage module to read the configuration information stored in the OTP storage module. The IIC module is respectively connected to the system control module and the external host in the digital module for interacting with the external host. The system control module is respectively connected to the digital filter module, the OTP control module, the power management unit, the on-chip low-frequency crystal oscillator, the power-on reset module and the IIC module for controlling the signal interaction and configuration between the modules. It contains some configurable registers for storing the collected temperature and humidity data and performing the functional configuration of the chip, such as temperature acquisition or humidity acquisition.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A low-power temperature and humidity sensor chip, comprising a sensor element for collecting and converting temperature and humidity information, characterized in that: Also includes: The ADC module is configured to be connected to the sensor element and the digital module respectively, and is used to convert the analog signal collected by the sensor element into a digital signal and transmit it to the digital module; A digital module is configured to connect to an external host and is used to control the interaction between the digital module in the chip and the ADC module and the communication with the external host; The power consumption management unit is configured to be connected to the ADC module and the digital module respectively, and is used to perform power consumption management on the ADC module and the digital module respectively.

2. The low-power temperature and humidity sensor chip according to claim 1, characterized in that: The digital module includes a digital filter module, which is connected to the ADC module and performs digital filtering processing on the data transmitted by the ADC module.

3. The low power consumption temperature and humidity sensor chip according to claim 1, characterized in that: The digital module includes an OTP control module, which is connected to the OTP storage module and is used to read the configuration information stored in the OTP storage module.

4. The low power consumption temperature and humidity sensor chip according to claim 1, characterized in that: The digital module includes an IIC module, which is respectively connected to a system control module in the digital module and an external host for interacting with the external host.

5. The low power consumption temperature and humidity sensor chip according to claim 1, characterized in that: The digital module includes a system control module, which is respectively connected to the power management unit, the on-chip low-frequency crystal oscillator and the power-on reset module in the chip and the digital filter module, OTP control module and IIC module in the digital module, and is used to control the signal interaction and configuration between the digital filter module, OTP control module, power management unit, on-chip low-frequency crystal oscillator, power-on reset module and IIC module.

6. The low-power consumption temperature and humidity sensor chip according to claim 5, characterized in that: It includes an on-chip low-frequency crystal oscillator configured to connect a system control module and a power consumption management unit. The on-chip low-frequency crystal oscillator is used to provide a clock signal, and the power consumption management unit is used to manage the power consumption of the on-chip low-frequency crystal oscillator.

7. The low-power temperature and humidity sensor chip according to claim 5, characterized in that: It includes a power-on reset module configured to connect the system control module and the power consumption management unit. The power-on reset module is used to provide a reset signal, and the power consumption management unit is used to manage the power consumption of the power-on reset module.

8. The low-power consumption temperature and humidity sensor chip according to claim 5, characterized in that: It includes an OTP storage module configured to connect the OTP control module and the power consumption management unit. The OTP storage module is used to store the power-on configuration information of the chip, and the power consumption management unit is used to manage the power consumption of the OTP storage module.

9. The low power consumption temperature and humidity sensor chip according to claim 1, characterized in that: The sensing element includes a temperature sensing element configured to be connected to an ADC module for collecting and converting temperature information into an analog signal.

10. The low power consumption temperature and humidity sensor chip according to claim 1, characterized in that: The sensing element includes a humidity sensing element configured to be connected to an ADC module for collecting and converting humidity information into an analog signal.

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