MB95650L datasheet(19/105 Pages) CYPRESS

19 / 105 page

Document Number: 002-04696 Rev. *A

Page 19 of 105

MB95650L Series

9. Pin Connection

Treatment of unused pins

If an unused input pin is left unconnected, a component may be permanently damaged due to malfunctions or latch-ups. Always pull

up or pull down an unused input pin through a resistor of at least 2 k

. Set an unused input/output pin to the output state and leave

it unconnected, or set it to the input state and treat it the same as an unused input pin. If there is an unused output pin, leave it

unconnected.

Power supply pins

To reduce unnecessary electro-magnetic emission, prevent malfunctions of strobe signals due to an increase in the ground level, and

conform to the total output current standard, always connect the VCC pin and the VSS pin to the power supply and ground outside the

device. In addition, connect the current supply source to the VCC pin and the VSS pin with low impedance.

It is also advisable to connect a ceramic capacitor of approximately 1.0 µF as a bypass capacitor between the VCC pin and the VSS

pin at a location close to this device.

DBG pin

Connect the DBG pin to an external pull-up resistor of 2 k

 or above.

After power-on, ensure that the DBG pin does not stay at “L” level until the reset output is released.

The DBG pin becomes a communication pin in debug mode. Since the actual pull-up resistance depends on the tool used and the

interconnection length, refer to the tool document when selecting a pull-up resistor.

RST pin

Connect the RST pin to an external pull-up resistor of 2 k

 or above.

To prevent the device from unintentionally entering the reset mode due to noise, minimize the interconnection length between a pull-up

resistor and the RST pin and that between a pull-up resistor and the VCC pin when designing the layout of the printed circuit board.

The PF2/RST pin functions as the reset input/output pin after power-on. In addition, the reset output of the PF2/RST pin can be enabled

by the RSTOE bit in the SYSC register, and the reset input function and the general purpose I/O function can be selected by the

RSTEN bit in the SYSC register.

C pin

Use a ceramic capacitor or a capacitor with equivalent frequency characteristics. The decoupling capacitor for the VCC pin must have

a capacitance equal to or larger than the capacitance of CS. For the connection to a decoupling capacitor CS, see the diagram below.

To prevent the device from unintentionally entering a mode to which the device is not set to transit due to noise, minimize the distance

between the C pin and CS and the distance between CS and the VSS pin when designing the layout of a printed circuit board.

Note on serial communication

In serial communication, reception of wrong data may occur due to noise or other causes. Therefore, design a printed circuit board

to prevent noise from occurring. Taking account of the reception of wrong data, take measures such as adding a checksum to the end

of data in order to detect errors. If an error is detected, retransmit the data.

DBG

RST

DBG/RST/C pins connection diagram

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