JP2735345B2 - Wireless communication device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device, and more particularly to a wireless communication device that uses a mobile communication device in two types of modes, a vehicle-mounted mode and a portable mode.

[Conventional technology]

2. Description of the Related Art Conventionally, in this type of wireless communication device, the same device has two use modes, an in-vehicle mode and a portable mode. When used not only for in-vehicle fixation but also for portable use, a battery is attached to the wireless communication device, thereby enabling portability and expanding the range of use. The use condition of the portable mode is limited by the battery capacity, the use time is limited, and the condition is different from that of the in-vehicle mode.
For example, in the portable mode, a battery saving function is added or the output power can be switched. Therefore, it is necessary to detect whether the portable mode is the vehicle-mounted mode and control these different functions.

In a conventional wireless communication device, a switching terminal is provided outside the wireless communication device in order to obtain this mode switching, for example, according to a use mode, such as a power connection in a vehicle-mounted mode and a ground connection in a portable mode. In this case, the external input level to the switching terminal is forcibly changed.

[Problems to be solved by the invention]

In this conventional wireless communication device, since the terminal for switching between the above-mentioned in-vehicle mode and the portable mode is required outside the wireless communication device, there is a disadvantage that the number of terminals of the device increases, and the number of terminals is reduced. It goes against the direction of cost reduction. Further, since this terminal is set in a state unique to each of the in-vehicle mode and the portable mode, there is a drawback that the terminal has a single function and is not used efficiently.

[Means for solving the problem]

The wireless communication device of the present invention is a wireless communication device having two types of use modes, an in-vehicle mode and a portable mode,
The wireless communication device main body has one switching terminal for inputting whether or not to apply a ground potential, and a CPU for recognizing whether or not the switching terminal is at the ground potential, and storing whether the portable mode is the vehicle-mounted mode, respectively. And the information of the vehicle-mounted mode or the portable mode stored in the CPU is stored only when the power is turned on.

〔Example〕

Next, the present invention will be described with reference to the drawings. FIGS. 1 (a) and 1 (b) are block diagrams showing a first embodiment of the present invention. In the embodiment of FIG. 1 (a), the case where the wireless communication apparatus main body 1 is used in a vehicle-mounted mode is described. FIG. 1B shows a case where a portable adapter 4 is connected to the switching terminal 2 of the wireless communication apparatus main body 1 and the portable communication mode is used in the portable mode. Here, the wireless communication apparatus main body 1 is provided with a CPU 3 that, when the power of the main body 1 is turned on, inputs the open or ground condition of the switching terminal 2 and recognizes whether the mode is the in-vehicle mode or the portable mode, respectively. As described above, the wireless communication device main body 1 can be used for both in-vehicle use and portable use depending on whether the switching terminal 2 is open from the time of turning on the power or whether the switching terminal 2 is connected to the ground potential by connecting the portable adapter 4.

Next, a second embodiment of the present invention will be described with reference to the circuit diagrams of FIGS. 2 (a) and 2 (b). The embodiment of FIG. 2 (a) shows a case where the wireless communication device main body 1A is used in a vehicle-mounted mode,
The embodiment of FIG. 2 (b) shows a case where a portable adapter 4 is connected to the switching terminal 2 of the wireless communication device main body 1A and used in a portable mode. Further, the wireless communication device main unit 1 includes a CPU 3 that inputs a condition of opening or grounding of the switching terminal 2 when the power of the main unit 1 is turned on, and recognizes whether the mode is a vehicle-mounted mode or a portable mode, respectively. Further, inside the wireless communication apparatus main body 1A, the collector is connected to the switching terminal 2, the emitter is connected to the ground, and the base is connected to the incoming signal terminal 9; The diode 6 has an anode connected to the input of the CPU 3 and a resistor 7 connected to the cathode. This diode 6 is for preventing a reverse current from the switching terminal 2 to the CPU 3. Further, a voltage + V is supplied to the other end of the resistor 7 when the power of the wireless communication device main body 1A is turned on. Note that a high-level signal is input to the incoming signal terminal 9 when the wireless communication device body 1A receives an incoming call. Now, the operation when the electromagnetic relay 8 having the control coil 8A connected to the external voltage + _VA is connected to the switching terminal 2 in the case of the on-vehicle mode shown in FIG. When the power of the wireless communication device 1A is turned on, the power supply voltage level +
A high level of V is applied. The CPU 3 is set to detect the in-vehicle mode based on the high level. Therefore, the setting of the in-vehicle mode is stored in the CPU 3. Thereafter, when an incoming signal is received at the incoming signal terminal 9 and the base of the transistor 5 becomes high level, the transistor 5 is turned on and the collector becomes low level.
Current flows through the electromagnetic relay 8 to the on state. The electromagnetic relay 8 can be used to control an external device such as sounding a horn of a car or turning on an external speaker. Here, even if the transistor 5 is turned on and the switching terminal 2 becomes low level,
Because CPU3 remembers that it is in vehicle mode,
No mode change is made. To further explain,
When the switching terminal 2 is open and the power is turned on to the wireless communication device main unit 1A and the CPU 3 recognizes that the vehicle is in the in-vehicle mode by the voltage + V, the switching terminal 2 is thereafter used for controlling an external device as another use. Can be used as

Next, the case of the portable mode shown in FIG. 2B will be described. The portable adapter 4 of the switching terminal 2 of the wireless communication device main body 1A is connected to set the switching terminal 2 to the ground potential. When the power of the main body 1A is turned on in this state, a current flows from the voltage + V through the resistor 7, the diode 6, and the switching terminal 2, and
The input of U3 is at ground potential. The CPU 3 receives this ground potential, recognizes that the mode is the portable mode, and is stored.

Since the power supply used in the vehicle-mounted mode is different from that in the portable mode such that the battery of the vehicle is a portable battery pack, the power supply is temporarily turned off when the mode is switched. Therefore, there is no inconvenience in determining the mode immediately after the power of the apparatus is turned on.

〔The invention's effect〕

As described above, the present invention detects the in-vehicle mode when the switching terminal is at a high level or is open when the wireless communication device is switched between the in-vehicle mode and the portable mode, and this detection is performed by the device. Since it is determined and stored according to the state of the switching terminal immediately after the power is turned on, there is an effect that after this switching terminal is used for mode determination, it can be used as a terminal for another function. Also,
By connecting the portable adapter to the switching terminal, it is determined and stored in the portable mode,
There is also an effect that the switching terminal can be used for portable mode recognition.

[Brief description of the drawings]

FIGS. 1A and 1B are block diagrams of a first embodiment of the present invention, and FIGS. 2A and 2B are circuit diagrams of a second embodiment of the present invention. 1, 1A ... wireless communication device main body, 2 ... switching terminal, 3 ... CP
U, 4 ... Portable adapter, 5 ... Transistor, 6 ...
Diode, 7: Resistance, 8: Electromagnetic relay, 8A: Control coil, 9: Incoming signal terminal.

Claims (2)

(57) [Claims] 1. A wireless communication apparatus having two types of use modes, a vehicle-mounted mode and a portable mode, wherein the wireless communication apparatus main body has one switching terminal for inputting whether or not to apply a ground potential; CPU that recognizes whether or not the switching terminal is at the ground potential, and stores whether the portable mode is the in-vehicle mode.
Wherein the information of the in-vehicle mode or the portable mode stored in the CPU is stored only when the power is turned on. A first means for causing the CPU to recognize a portable mode or an in-vehicle mode depending on whether or not the switching terminal applies a ground potential; and an external device when the switching terminal does not provide a ground potential. 2. The wireless communication device according to claim 1, further comprising: a second unit that is connected to and drives the external device by a control circuit built in the wireless communication device main body.