DSA504RT datasheet(16/73 Pages) MICROCHIP

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DSA504RT

Host Interface

Preliminary Data Sheet

DS50004033A - 16

Host Interface

This section describes about I2C interface available for DSA504RT device.

4.1.

I2C Serial Interface

DSA504RT has I2C interface. The I2C interface is compatible with NXP UM10204 specifications

for standard (100kHz) and fast (400kHz) modes. During part creation in the GUI software, the

customer can select the default device I2C address provided by the GUI or can choose another client

address that’s not reserved according to Table 4-1. DSA504RT supports 7-bit addressing and 10-bit

addressing.

To solve the issue of conflict of address between two devices placed on the same I2C bus, a GPIO

can be used as the LSB (least significant bit) in the device I2C client address so the user can use that

bit to distinguish between the two devices addresses by setting it to Low (0) or High (1).

Table 4-1. Reserved Addresses

Client Address

R/W Bit

Description

0000_000

General call address (Note 1)

0000_000

Start byte (Note 2)

0000_001

CBUS address (Note 3)

0000_010

Reserved for different bus format (Note 4)

0000_011

Reserved for future purposes

0000_1XX

HS-mode host code

1111_1XX

Reserved for future purposes

1111_0XX

10-bit client addressing

Notes:

1. DSA504RT does not support general calls.

2. No device is allowed to acknowledge at the reception of START byte.

3. Reserved to enable inter-mixing of CBUS compatible and I2C-compatible devices in the same system.

4. Reserved to enable I2C compatible buses with different format to be mixed with I2C.

4.2.

I2C Byte Format

The 7-bit and 10-bit Chip ID and address structures are shown in Table 4-2 and Table 4-3. The data

byte that follows is sent MSB first, multi-byte transmissions are sent from lower byte to upper byte.

CHIPID is a 10-bit OTP register field and acts as Client Address (Call Address and CBUS Address are

not supported).

Table 4-2. I2C 7-bit CHIPID First 3 Byte Call Structure

Byte

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

CHIPID[6]

CHIPID[5]

CHIPID[4]

CHIPID[3]

CHIPID[2]

CHIPID[1]

CHIPID[0]

0 or 1

ADDR[9]

ADDR[8]

ADDR[7]

ADDR[6]

ADDR[5]

ADDR[4]

ADDR[3]

ADDR[2]

ADDR[1]

ADDR[0]

DSA504RT Datasheet(PDF) 16 Page - Microchip Technology

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