MB9BF412RPMC-G-JNE2 datasheet(49/112 Pages) CYPRESS

49 / 112 page

Document Number: 002-05615 Rev. *D

Page

49 of 112

MB9B410R Series

Handling Devices

Power supply pins

In products with multiple VCC and VSS pins, respective pins at the same potential are interconnected within the device in order to

prevent malfunctions such as latch-up. However, all of these pins should be connected externally to the power supply or ground

lines in order to reduce electromagnetic emission levels, to prevent abnormal operation of strobe signals caused by the rise in the

ground level, and to conform to the total output current rating.

Moreover, connect the current supply source with each POWER pins and GND pins of this device at low impedance. It is also

advisable that a ceramic capacitor of approximately 0.1 µF be connected as a bypass capacitor between each Power supply pin

and GND pin, between AVCC pin and AVSS pin near this device.

Stabilizing power supply voltage

A malfunction may occur when the power supply voltage fluctuates rapidly even though the fluctuation is within the recommended

operating conditions of the VCC power supply voltage. As a rule, with voltage stabilization, suppress the voltage fluctuation so that

the fluctuation in VCC ripple (peak-to-peak value) at the commercial frequency (50 Hz/60 Hz) does not exceed 10% of the VCC

value in the recommended operating conditions, and the transient fluctuation rate does not exceed 0.1 V/ μs when there is a

momentary fluctuation on switching the power supply.

Crystal oscillator circuit

Noise near the X0/X1 and X0A/X1A pins may cause the device to malfunction. Design the printed circuit board so that X0/X1,

X0A/X1A pins, the crystal oscillator (or ceramic oscillator), and the bypass capacitor to ground are located as close to the device

as possible.

It is strongly recommended that the PC board artwork be designed such that the X0/X1 and X0A/X1A pins are surrounded by

ground plane as this is expected to produce stable operation.

Evaluate oscillation of your using crystal oscillator by your mount board.

Using an external clock

When using an external clock, the clock signal should be input to the X0, X0A pin only and the X1, X1A pin should be kept open.

Handling when using Multi function serial pin as I2C pin

If it is using multi function serial pin as I2C pins, P-ch transistor of digital output is always disable. However, I2C pins need to keep

the electrical characteristic like other pins and not to connect to external I2C bus system with power OFF.

 Example of Using an External Clock

Device

X0(X0A)

X1(X1A)

Open

MB9BF412RPMC-G-JNE2 Datasheet(PDF) 49 Page - Cypress Semiconductor