TC9350BFN-T00,TC9350BFN-T01

2004-01-20

3

Pin Explanation

Symbol

Description

5 V power supply. Guaranteed 4.35 to 5.25 V.

GND

Ground.

Connected to a 6-MHz ceramic resonator (ceramic resonator input pin).

Connected to a 6-MHz ceramic resonator (ceramic resonator output pin).

LED

When the mouse is operating, the LED is always turned on by current drive with N-MOS turned on. The sink

current is 50 mA maximum. Current drive is turned off in suspend mode.

SW [1:3]

Connected to the buttons (left, middle, and right) of the mouse. Pulled up to VDD by built-in resistors.

To prevent chattering noise, the SW signals are not recognized until 15 ms after the first change in their state,

allowing the signals to be sufficiently stabilized before entering the internal circuit.

The pins are assigned to the mouse switches as follows:

SW1: Left switch

SW2: Middle switch

SW3: Right switch

SCK

Serial port clock (output) pin.

SDIO

Serial data input and output pin.

VCNT

When the mouse is operating, the TC9350BFN supplies power to the optical mouse sensor via an external

transistor by current drive with N-MOS turned on. In suspend mode, N-MOS is turned off, stopping power

supply to the optical mouse sensor.

NU

No use pin. Please connect to GND.

PT3A/B

Encoder input pins. PT3A and PT3B are used as scroll pins. Data is sampled at intervals of 100

µs.

The TC9350BFN-T00 enables the built-in pull-up resistors of the encoder input pins (PT3A, PT3B) when the

mouse is operating. It is suitable for a mechanical encoder. (The pull-up resistors are disabled in suspend

mode.)

When using a mechanical encoder, it is recommended to use an external capacitor to reduce chattering and

bouncing. In stable state, PT3A

= PT3B.

The TC9350BFN-T01 maintains the encoder input pins (PT3A, PT3B) always in high-impedance state. It is

suitable for an optical encoder (phototransistor and LED).

DP, DM

It connects with the both-directions data bus line of USB.

Note:

damage the IC chip.

When designing an application and mounting the chip, be careful not to apply overvoltage or overcurrent to

peripheral components.