LC651306A View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC651306A

4-Bit Single-Chip Microcontroller for Small-Scale Control Applications

SANYO -> Panasonic 

LC651306A/04A/02A/01A

• Other note on all oscillator circuit:

• Place the lines for signals that can easily change suddenly, high amplitude signals connected to the higher capacity voltage

(+15 V) ports, and powerful current supplies as far as possible from the oscillation circuit, and do not cross these lines

with lines that have relevance to the clock.

3. RES: Reset Pin

• The length of line (Lres) between the RES pin and the external circuit should be as short as possible.

• The length of lines (L1 and L2) between the RES pin and the capacitor (Cres), and the VSS and the capacitor should

be as short as possible.

External

Circuit

VSS

L2

Cres

RES

L1

Lres

Figure 3. RES Pin Patterns

4. TEST: Test Pin

• The length of line (L) between the VSS and the TEST pin should be as short as possible.

• The TEST pin and the VSS pin should be connected as close as possible to the VSS pin.

VSS

TEST

Figure 4. Test Pin Patterns

5. AD0 to AD7: Analog Input Pins

The connection for the analog input pins, such as A/D converter input pins and comparator input pin, should meet the

following conditions.

• The length of the line (L1) between the damping resistor (R1) and each analog pin should be as short as possible.

• The capacitor added between each analog pin and AV- pin (base voltage input pin for A/D converter) should be located

as close as possible to the AV- input pin.

External circuit

(sensor block)

Rl

Analog

Input Pins

C

AV-

VSS

Figure 5. Analog Input Pins Patterns

6. I/O Pins

All I/O pins on these microcontrollers have both input and output function.

• When used as an input pin, add a damping resistor and keep the length of the line to that pin as short as possible.

[Supplement]

In addition to the above techniques in designing a circuit board, the following options and programming methods are also

effective in preventing defects (such as malfunction or a runaway program) in the microcontroller.

• If signals are input from external sources when the microcontroller power supply is unstable, select the higher capacity

voltage (N-channel open drain) output type for the input pin, and add a damping resistor close to the pin.

No.6727-20/21

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