7.4.4 Shutdown Mode

Shutdown mode for TUSB320 device is defined as follows:

• Supply voltage available and EN_N pin is pulled high.

• EN_N pin has internal pullup resistor.

• The TUSB320 device is off, but still maintains the Rd on the CC pins.

7.5 Programming

For further programmability, the TUSB320 device can be controlled using I2C. The TUSB320 device local

I2C interface is available for reading/writing after TI2C_EN when the device is powered up. The SCL and SDA

terminals are used for I2C clock and I2C data respectively. If I2C is the preferred method of control, the ADDR pin

must be set accordingly.

Table 7-5. TUSB320 I2C Addresses

TUSB320 I2C Target Address

ADDR pin

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (W/R)

H

1

1

0

0

0

0

1

0/1

L

1

1

0

0

0

0

0

0/1

The following procedure should be followed to write to TUSB320 I2C registers:

1. The controller initiates a write operation by generating a start condition (S), followed by the TUSB320 7-bit

address and a zero-value R/W bit to indicate a write cycle

2. The TUSB320 device acknowledges the address cycle

3. The controller presents the sub-address (I2C register within the TUSB320 device) to be written, consisting of

one byte of data, MSB-first

4. The TUSB320 device acknowledges the sub-address cycle

5. The controller presents the first byte of data to be written to the I2C register

6. The TUSB320 device acknowledges the byte transfer

7. The controller may continue presenting additional bytes of data to be written, with each byte transfer

completing with an acknowledge from the TUSB320 device

8. The controller terminates the write operation by generating a stop condition (P)

The following procedure should be followed to read the TUSB320 I2C registers:

1. The controller initiates a read operation by generating a start condition (S), followed by the TUSB320 7-bit

address and a one-value R/W bit to indicate a read cycle

2. The TUSB320 device acknowledges the address cycle

3. The TUSB320 device transmits the contents of the memory registers MSB-first starting at register 00h or

last read sub-address+1. If a write to the T I2C register occurred prior to the read, then the TUSB320 device

starts at the sub-address specified in the write.

4. The TUSB320 device waits for either an acknowledge (ACK) or a not-acknowledge (NACK) from the

controller after each byte transfer; the I2C controller acknowledges reception of each data byte transfer

5. If an ACK is received, the TUSB320 device transmits the next byte of data

6. The controller terminates the read operation by generating a stop condition (P)

The following procedure should be followed for setting a starting sub-address for I2C reads:

1. The controller initiates a write operation by generating a start condition (S), followed by the TUSB320 7-bit

address and a zero-value R/W bit to indicate a read cycle

2. The TUSB320 device acknowledges the address cycle

3. The controller presents the sub-address (I2C register within the TUSB320 device) to be read, consisting of

one byte of data, MSB-first

4. The TUSB320 device acknowledges the sub-address cycle

5. The controller terminates the read operation by generating a stop condition (P)

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TUSB320, TUSB320I

SLLSEN9F – MAY 2015 – REVISED MARCH 2022

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