VPC3230D datasheet(30/78 Pages) MICRONAS

30 / 78 page

VPC 323xD, VPC 324xD

ADVANCE INFORMATION

Micronas

3. Serial Interface

3.1. I2C-Bus Interface

Communication between the VPC and the external

controller is done via I2C-bus. The VPC has an I2C-bus

slave interface and uses I2C clock synchronization to

slow down the interface if required. The I2C-bus inter-

face uses one level of subaddress: one I2C-bus

address is used to address the IC and a subaddress

selects one of the internal registers. For multi

VPC32xxD applications the following three I2C-bus

chip addresses are selectable via I2CSEL pin:

The registers of the VPC have 8 or 16-bit data size;

16-bit registers are accessed by reading/writing two

8-bit data words.

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.

3.2. Control and Status Registers

Table 3–1 gives definitions of the VPC control and sta-

tus registers. The number of bits indicated for each

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 opera-

tions. Write registers that can be read back are indi-

cated in Table 3–1.

Functions implemented by software in the on-chip con-

trol microprocessor (FP) are explained in Table 3–1.

Fig. 3–1: I2C-bus protocols

A0 R/W I2CSEL

0011

1/0

VSUP

0011

1/0

VRT

0010

1/0

GND

SDA

SCL

1000 111

WAck

Ack

0111 1100

Ack

1 or 2 byte Data

1000 111

high byte Data

low byte Data

Ack

Nak

Start

Stop

Ack

Nak P

I2C write access

subaddress 7c

I2C read access

subaddress 7c

Ack

1000 111

W Ack

FPWR

Ack

byte high

send FP-address-

Ack

byte low

send FP-address-

Ack

1000 111

W Ack

FPDAT

Ack

byte high

send data-

Ack

byte low

send data-

Ack

I2C write access

to FP

1000 111

W Ack

FPRD

Ack

byte high

send FP-address-

Ack

byte low

send FP-address-

Ack

1000 111

W Ack

FPDAT

Ack

byte high

receive data-

Ack

byte low

receive data-

Nak

I2C read access

to FP

1000 111

R Ack

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