JPH0314831Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a remote control transmitting IC that outputs an identification code along with key data.

(b) Conventional technology “NEC general-purpose remote control transmitter IC μPD1913C,
1943G, 6102G Reception Software Application Technical Data'' discloses ICs for remote control transmission, and these ICs can be used in various devices such as television receivers and radio receivers, and can be used by multiple users. can be used in

However, if the same IC is used in multiple devices, malfunctions may occur, so an identification code called a custom code or address code is assigned to each device and each user, and key data corresponding to the key switch operated from the transmitter side is assigned. At the same time, this identification code was sent out. As shown in FIG. 4, the identification code is set by whether or not a diode 19 is connected to a part of the key matrix circuit 18 outside the IC 17.

(c) Problems that the invention aims to solve In the conventional technology, the identification code was set by connecting a diode outside the IC, which was disadvantageous in terms of cost and space. Even if the identification code was managed on the side, if a diode was accidentally connected to the wrong position, another user's device could malfunction.

(d) Means for solving the problem The present invention has two sets of identification code setting sections: a first setting section that is set using an external terminal, and a second setting section that is set inside the IC using fixed storage means such as metal wiring or mask ROM. It is composed of two setting sections.

(E) Effect In this invention, the identification code setting part is divided into the first setting part and the second setting part, so the identification code is set for each user inside the IC, and the IC supplier side can set the identification code for each user. The identification code is managed and set for each device by each user through an external terminal, allowing the user to manage the identification code for each device.

(F) Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention, and shows the entire remote control transmitter using a remote control transmitting IC 1. In Figure 1, 2 is a battery such as a battery, 3 is an infrared light emitting diode,
4 is a drive transistor, 5 is a key matrix circuit to which a plurality of key switches are connected, 6 is an oscillation circuit configured by connecting a ceramic oscillator 7, 8 is a timing signal generation circuit that generates various timing signals, and 9 is a key scan. A key scan signal output circuit 10 inputs key input signals K0 to K7 from the key matrix circuit 5 and key scan signals _T0 to _T3 , and outputs key data D corresponding to the operated key switch. A key input decoder 11 that outputs ₀ to _D4 is composed of 14 flip-flops, takes in key data _D0 to _D4 and identification codes _C0 to _C8 according to the timing signal TM, and converts both data into transmission data. 12 is an output circuit that modulates the transmission data with the modulation signal P and applies the modulated output to the base of the drive transistor 4, and the identification code C ₀ ~
Of _C8 , the first to third bits _C0 to _C2 are set by a first setting section having external terminals 13a to 13c, and the fourth to ninth bits C3 _{to C8} are set by internal terminals 14a to 14c. It is set by a second setting section having 14f.

That is, each of the external terminals 13a to 13c is connected to the power supply voltage V _DD or the ground potential by soldering or the like, so that each bit C ₀ , C ₁ , C ₂ is set to "1" or "0". , internal terminal 14a~
Each bit C ₃ , C ₄ , ..., C ₈ is connected to a power supply terminal 15 or a ground terminal 16 through metal wiring inside the IC, or is connected to a storage means such as a mask ROM. Set to "1" or "0".

Therefore, as shown in Figure 2, the IC supplier assigns identification data C ₃ to C ₈ to each user A to D, and sets this identification data in the second setting section inside the IC before shipping. , each user is shown in Figure 3 I~
As shown in C, identification data C ₀ to _{C 2} can be freely set for each device such as a television and a video camera in the first setting section. In other words, among the identification codes C ₀ to C ₈ ,
It is now possible to manage C ₃ to _{C 8} on the IC supplier side and manage C ₀ to _{C 2} on the user side, making it easier to manage and set identification codes on both sides, and reducing the risk of malfunction. gender decreases. And if,
Even if you make a mistake in the settings using the external terminal, C ₃ to _{C 8} are always different from other users' identification codes, so devices of different users will not malfunction.

(g) Effects of the invention According to the invention, the code part of the identification code that determines the user can be set inside the IC.
Even if you make a mistake in setting the code using the external terminal, it is possible to reliably prevent equipment of different users from malfunctioning. Furthermore, setting the cord on the user side is as simple as connecting the external terminal to the power supply potential or ground potential depending on each device.

Furthermore, since the IC supplier side only has to manage the code portion of the identification code that determines the user, and the user side only has to manage the code portion that determines the device, management becomes easy.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the correspondence between identification data and users, FIGS. 3 A to C are explanatory diagrams showing the correspondence between identification data and equipment, FIG. 4 is a block diagram showing a conventional example. Explanation of main drawing numbers, 1...Remote control transmission IC,
5...Key matrix circuit, 10...Key input decoder, 11...Data register, 12...Output circuit, 13a-13c...External terminal, 14a-1
4f...Internal terminal.

Claims (1)

[Scope of utility model registration request] For remote control transmission that outputs key data corresponding to the operated key switch and an identification code for identifying the device and user as transmission data.
An IC for remote control transmission, characterized in that the identification code setting section comprises a first setting section that sets the identification code using an external terminal, and a second setting section that sets the identification code using a fixed storage means inside the IC.