MB9B360R datasheet(54/166 Pages) CYPRESS

54 / 166 page

Document Number: 002-04872 Rev.*A

Page 54 of 166

MB9B360R Series

Handling when using Multi-function serial pin as I

2C pin

If it is using the multi-function serial pin as I

2C pins, P-ch transistor of digital output is always disabled.

However, I

2C pins need to keep the electrical characteristic like other pins and not to connect to the external I2C bus system with

power OFF.

C Pin

This series contains the regulator. Be sure to connect a smoothing capacitor (CS) for the regulator between the C pin and the GND

pin. Please use a ceramic capacitor or a capacitor of equivalent frequency characteristics as a smoothing capacitor.

However, some laminated ceramic capacitors have the characteristics of capacitance variation due to thermal fluctuation (F

characteristics and Y5V characteristics). Please select the capacitor that meets the specifications in the operating conditions to use

by evaluating the temperature characteristics of a capacitor.

A smoothing capacitor of about 4.7

μF would be recommended for this series.

Mode pins (MD0)

Connect the MD pin (MD0) directly to VCC or VSS pins. Design the printed circuit board such that the pull-up/down resistance stays

low, as well as the distance between the mode pins and VCC pins or VSS pins is as short as possible and the connection

impedance is low, when the pins are pulled-up/down such as for switching the pin level and rewriting the Flash memory data. It is

because of preventing the device erroneously switching to test mode due to noise.

Notes on power-on

Turn power on/off in the following order or at the same time.

If not using the A/D converter and D/A converter, connect AVCC = VCC and AVSS = VSS.

Turning on :

VBAT → VCC → USBVCC

VCC → AVCC → AVRH

Turning off :

USBVCC → VCC → VBAT

AVRH → AVCC → VCC

Serial Communication

There is a possibility to receive wrong data due to the noise or other causes on the serial communication.

Therefore, design a printed circuit board so as to avoid noise.

Consider the case of receiving wrong data due to noise, perform error detection such as by applying a checksum of data at the end.

If an error is detected, retransmit the data.

Differences in features among the products with different memory sizes and between Flash products and

MASK products

The electric characteristics including power consumption, ESD, latch-up, noise characteristics, and oscillation characteristics among

the products with different memory sizes and between Flash products and MASK products are different because chip layout and

memory structures are different.

If you are switching to use a different product of the same series, please make sure to evaluate the electric characteristics.

Device

VSS

GND

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