JPH0553674A - Portable teminal with temperature alarm function - Google Patents

Abstract

PURPOSE:To issue an alarm of inhibition a user using the portable terminal for outdoor use when it is located outside the operation insurance temperature range and to prevent the destruction of memory data due to an unstable operation of an MPU. CONSTITUTION:The portable terminal is provided with a temperature detection element 18, a comparison circuit 19 comparing the output of this element with the voltage of a reference voltage part 20, a display element 21 which lights a lamp by the output of the comparison circuit 19, and an MPU 12 having a stop signal terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal with a temperature alarm function which is used outdoors.

[0002]

2. Description of the Related Art In recent years, mobile terminals have been increasingly used outdoors for rationalization of office work. The conventional mobile terminal will be described below. FIG. 2 is a block diagram of a conventional mobile terminal. In FIG. 2, 31 is a display device, 32 is a microprocessor (hereinafter referred to as MPU), 33
Is used to store programs and data in main memory, 34
Is a keyboard, 35 is a communication port, and 36 is a battery. The operation of the mobile terminal configured as above will be described below. Usually, the portable terminal is taken out of the outdoors, and while the necessary data is visually confirmed on the display device 31, it is input from the keyboard 34 and simultaneously stored in the main memory 33. After this, return to the office and send the data to the center computer via the communication port. Thus, the mobile terminal is used to collect data outdoors.

[0003]

However, in the above-mentioned conventional configuration, when the temperature is too high when exposed to direct sunlight outdoors or left in the car, the temperature exceeds the stable operating temperature range of the MPU 32 and the stored data is stored. Had the problem of destroying. The present invention solves the above-mentioned conventional problems, and displays a warning when the temperature exceeds a stable operating temperature range, and at the same time, stops the MPU and prevents the data stored in the main memory from being destroyed. It is intended to provide.

[0004]

In order to achieve this object, in a portable terminal of the present invention, a temperature detecting element, a circuit for comparing the output of this element with a reference voltage and outputting the temperature detecting element, and a display element which is turned on by the output of the circuit. M with stop signal (reset, etc.) terminal
It is configured by a PU.

[0005]

Therefore, with the above configuration, when the temperature exceeds the specified temperature, the display element is turned on, and the user of this portable terminal is warned that the portable terminal cannot be used. At the same time, the MPU can also be stopped to avoid unstable operation.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block configuration of a portable terminal with a temperature warning function according to an embodiment of the present invention. In FIG. 1, 11 is a display device, 12 is an MPU, 13 is a main memory and is used for storing programs and data, 14 is a keyboard, 15 is a communication port, 16 is a battery, 17 is a resistor, 18 is a temperature detecting element (thermistor, etc.). ), 19 is a comparison circuit that compares the temperature detection element output with a reference voltage, 20 is a reference voltage section, and 21 is a display element
(LED, etc.) and 22 are stop signal terminals of the MPU.

The operation of the portable terminal configured as described above will be described with reference to FIG. First, the resistance value of the temperature detecting element 18 rapidly increases as the temperature rises, so that the input voltage of the comparison circuit 19 rises. When this voltage exceeds the voltage of the reference voltage section 20, the output of the comparison circuit 19 becomes active and at the same time the display element 21 is activated and turned on, and the MPU is stopped by the same signal. Table 1 compares the characteristics of the mobile terminal according to this embodiment with the characteristics of the conventional mobile terminal.

[0008]

[Table 1]

As is clear from Table 1, the portable terminal according to this embodiment protects the data in the main memory while displaying an unusable warning to the user when the temperature exceeds the stable operating temperature range of the MPU.

[0010]

As described above, according to this embodiment, by providing the temperature detecting circuit, its display element and the MPU stop function, it is possible to protect the unusable warning display and the data outside the stable operation guaranteed temperature. ..

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a mobile terminal with a temperature warning function according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional mobile terminal.

[Explanation of symbols]

11, 31 ... Display device, 12, 32 ... Microprocessor (M
PU), 13, 33 ... Main memory, 14, 34 ... Keyboard, 1
5,35 ... communication port, 16,36 ... battery, 17 ... resistor, 18
... Temperature detection element, 19 ... Comparison circuit, 20 ... Reference voltage section,
21 ... Display element, 22 ... Stop signal terminal of MPU, 23, 37
… Signal lines, 24, 38… Power lines.

Claims (1)

[Claims] 1. A temperature detection element, a reference voltage section, a comparison circuit for comparing the output of the temperature detection element and the voltage of the reference voltage section, a display element lit by the output of the comparison circuit, and a stop signal terminal. A portable terminal with a temperature warning function, comprising a microprocessor having the same, and having a function of displaying a warning and stopping the operation when the temperature exceeds a stable operating temperature range of the device.