DDP3300A datasheet(22/53 Pages) MICRONAS

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DDP 3300 A

PRELIMINARY DATA SHEET

MICRONAS INTERMETALL

3. Serial Interface

3.1. I2C-bus Interface

Communication between the DDP 3300 A and the ex-

ternal controller is done via I2C-bus. The DDP 3300 A

has an I2C-bus slave interface and uses I2C clock syn-

chronization to slow down the interface if required. The

I2C-bus interface uses one level of subaddress: one I2C-

bus address is used to address the IC and a subaddress

selects one of the internal registers. The I2C-bus chip

address is given below:

Note: The I2C address is subject to change!

R/W

0/1

The registers of the DDP 3300 A have 8 or 16-bit data

size; 16-bit registers are accessed by reading/writing

two 8-bit data words.

Functions implemented by firmware in the on-chip con-

trol microprocessor (FP) located in the VPC are ex-

plained in the VPC datasheet.

Figure 3–1 shows I2C-bus protocols for read and write

operations of the interface; the read operation requires

an extra start condition and repetition of the chip address

with read command set.

1 or 2 byte data

high byte data

Ack

0111 1100

Ack

SDA

SCL

low byte data

Ack

Ack =

Nak=

Start

Stop

Ack

Nak

Fig. 3–1: I2C-bus protocols

1000 101

I2C read access

subaddress 7c

Example:

I2C read access

subaddress 7c

3.2. Control and Status Registers

Table 3–1 gives definitions of the DDP 3300 A control

and status registers. The number of bits indicated for

each register in the table is the number of bits imple-

mented in hardware, i.e., a 9-bit register must always be

accessed using two data bytes, but the 7 MSB will be

don’t care on write operations and 0 on read operations.

Write registers that can be read back are indicated in the

following table.

A hardware reset initializes all control registers to 0. The

automatic chip initialization loads a selected set of regis-

ters with the default values given in Table 3–1.

The register modes given in Table 3–1 are:

write only register

w/r

write/read data register

read data from DDP 3300 A

The

mnemonics

used

the

INTERMETALL

DDP 3300 A demo software are given in the last column.

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