MB91F587LB datasheet(38/177 Pages) SPANSION

38 / 177 page

D at aS h ee t

August 22, 2014, MB91F587LA_DS705-00012-2v0-E

CONFIDENTIAL

•

Crystal oscillation circuit

An external noise to the X0 or X1 pin may cause a device malfunction. The printed circuit board must be

designed to lay out X0 and X1 pins, crystal oscillator (or ceramic resonator), and the bypass capacitor to be

grounded to the close position to the device.

The printed circuit board artwork is recommended to surround the X0 and X1 pins by ground circuits.

•

Mode pin (MD[1:0])

Connect the MD[1:0] mode pin to the VCC or VSS pin directly. To prevent an erroneous selection of test

mode caused by the noise, reduce the pattern length between each mode pin and VCC or VSS pin on the

printed circuit board. Also, use the low-impedance pin connection.

•

During power-on

To prevent a malfunction of the voltage step-down circuit built in the device, set the voltage rising time to

have 50µs or longer (between 0.2V and 2.7V) during power-on.

•

Notes during PLL clock operation

When the PLL clock is selected and if the oscillator is disconnected or if the input is stopped, this clock

may continue to operate at the free running frequency of the self oscillator circuit built in the PLL. This

operation is not guaranteed.

•

Treatment of R/D converter* and A/D converter power supply pins

Connect the pins to have AVCC0 = AVCC3 = AVRH0 = AVRH1=AVRH2=AVRH3=VCC and

AVSS0/AVRL0=AVSS1/AVRL1=AVSS2/AVRL2=AVSS3/AVRL3=VSS even if the R/D converter* and

the A/D converter are not used.

•

Note on using external clock

The external clock is unsupported.

External direct clock input cannot use.

•

Power-on sequence of R/D converter* and A/D converter power supply analog inputs

Be sure to turn on the digital power supply (VCC5) first, and then turn on the R/D converter* and A/D

converter power supplies (AVCC0*, AVCC3, AVRH0*, AVRH1, AVRH2, AVRH3, AVRL0*, AVRL1,

AVRL2, AVRL3) and analog inputs (MAG_PLUS*, MAG_MINUS*, COS_PLUS*, COS_MINUS*,

SIN_PLUS*, SIN_MINUS*, COS_IN*, SIN_IN*, AN0 to AN23). Also, turn off the R/D converter* and

A/D converter power supplies (AVCC0*, AVCC3, AVRH0*, AVRH1, AVRH2, AVRH3, AVRL0*, AVRL1,

AVRL2, AVRL3) and analog inputs (MAG_PLUS*, MAG_MINUS*, COS_PLUS*, COS_MINUS*,

SIN_PLUS*, SIN_MINUS*, COS_IN*, SIN_IN*, AN0 to AN23) first, and then turn off the digital power

supply (VCC5). When the AVRH0*, AVRH1, AVRH2, and AVRH3 pin voltages are turned on or off, they

must not exceed AVCC0* and AVCC3. Even if a common analog input pin is used as an input port, its input

voltage must not exceed AVCC0* or AVCC3. (However, the analog power supply voltage and digital power

supply voltage can be turned on or off simultaneously.)

•

Treatment of C pin

This device contains a voltage step-down circuit. A capacitor must always be connected to the C pin to

assure the internal stabilization of the device. For the standard values, see the "Recommended Operating

Conditions" of the latest data sheet.

*: MB91F585LA/F586LA/F587LA/F585LC/F586LC/F587LC only

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