JPH05284670A - Integrated circuit incorporating battery back-up - Google Patents

Abstract

PURPOSE:To facilitate the addition of a battery back-up function to an integrated circuit and to ensure compatibility with a general purpose integrated circuit by incorporating the battery back-up function for the integrated circuit in the integrated circuit. CONSTITUTION:A diode 2 for separating a back-up battery from the outside, a capacitor C and a resistor R for charging and discharging a battery are provided at an input power supply for an existing integrated circuit in order to ensure battery back-up function upon power interruption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated circuit with a built-in battery backup, and more particularly to an integrated circuit with a built-in battery backup which has a function of ensuring the operation of the integrated circuit even when the external battery power source is interrupted.

[0002]

2. Description of the Related Art A battery backup function in a conventional electronic circuit has a battery, a capacitor,
The battery power supply of the circuit formed by including the diode, the resistor, etc. has enabled the backup of the power supply for the integrated circuit.

[0003]

This conventional battery backup system requires a space for the battery backup circuit itself because a battery backup circuit must be added to the outside of the integrated circuit.

It is difficult to add or delete the battery backup function.

It is necessary to classify the power source pattern depending on the necessity of the battery backup function.

The user needs to design a battery backup circuit.

Since the battery circuit is external, it must be handled with care.

There are various problems such as the above.

The present invention solves the above-mentioned problems, does not require a special space, is easy to add or delete functions, does not require division of power supply patterns depending on the necessity of functions, and is a circuit design on the user side. An object is to provide an integrated circuit with a built-in battery backup that does not require and is easy to handle.

[0010]

An integrated circuit with a built-in battery backup according to the present invention is normally charged by an external battery power source together with the integrated circuit for charging, and when the external battery power source is uninterrupted, the charged electric charge is charged. It is configured to include a battery backup means for discharging to secure the operation of the integrated circuit.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram (a) showing a normal operation of one embodiment of the present invention and a configuration diagram (b) showing an operation when the power supply is interrupted.

In the present embodiment, the memory element portion 1 as an integrated circuit is built in the integrated circuit together with the memory element portion 1,
It comprises a diode 2 and two sets of a resistor R and a capacitor C which constitute a battery backup means.

Next, the operation of this embodiment will be described.

A power supply VDD is supplied to the power supply terminal, and FIG.
As shown in (a), a current flows in the direction of the arrow, and the capacitor C is charged with electric charge through the resistor R.

Further, the power supply VDD is also supplied to the memory element portion 1, and the read / write operation of the memory element portion 1 with respect to the memory is normally performed.

Next, a power source V for the integrated circuit from the outside
When the supply of DD is interrupted for some reason, as shown in FIG. 1B, the charge of the capacitor C charged in FIG. 1A is discharged to the memory element unit 1. The function of battery backup is guaranteed and the memory device section 1
The state of can hold the state before the power is turned off normally.

At this time, due to the diode 2 in the integrated circuit, there is no leakage of charges to the outside, and battery backup is performed only inside the integrated circuit.

[0019]

As described above, according to the present invention, by incorporating the battery backup function in the integrated circuit,
The battery backup function can be easily added, the space for the battery backup function can be reduced, the design work can be reduced, and the safety of handling can be ensured because the battery cannot be seen outside.

Further, by configuring all the circuits with the present integrated circuit, there is an effect that the state before power-off can be maintained as it is and the operation before power-off can be resumed as it is.

[Brief description of drawings]

FIG. 1 is a configuration diagram (a) showing an operation at a normal time of an embodiment of the present invention and a configuration diagram (b) showing an operation when a power supply is interrupted.

[Explanation of symbols]

 1 memory element part 2 diode C capacitor R resistance

Claims (1)

[Claims] 1. A battery backup means for always charging the battery by applying a power source together with the integrated circuit by an external battery power source and discharging the charged charge when the external battery power source is uninterrupted to ensure the operation of the integrated circuit. An integrated circuit with built-in battery backup, characterized by being built-in.