MB9B320TA datasheet(68/141 Pages) SPANSION

68 / 141 page

D a t a S h e e t

January 30, 2015, MB9B320TA_DS706-00062-2v0-E

CONFIDENTIAL

 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 : VCC → USBVCC

VCC → AVCC → AVRH

Turning off : USBVCC → VCC

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 memory 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 memory

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.

 Pull-Up function of 5V tolerant I/O

Please do not input the signal more than VCC voltage at the time of Pull-Up function use of 5V tolerant I/O.

 Adjoining wiring on circuit board

If wiring of the crystal oscillation circuit (X0/X1 and X0A/X1A) adjoins and also runs in parallel with the

wiring of GPIO, there is a possibility that the oscillation erroneously counts because oscillation wave has

noise with the change of GPIO. Keep as much distance as possible between both wirings and insert the

ground pattern between them in order to avoid this possibility.

MB9B320TA Datasheet(PDF) 68 Page - SPANSION