MAS3504D datasheet(12/40 Pages) MICRONAS

12 / 40 page

MAS 3504D

Micronas

3. Control Interfaces

3.1. I2C Bus Interface

The MAS 3504D is controlled via the I2C bus slave

interface.

3.1.1. Device Address and Subaddresses

The IC is selected by transmitting the MAS 3504D

device addresses. (see Table 3–1).

Writing is done by sending the device write address,

(3Ahex) followed by the subaddress byte (68hex) and

two or more bytes of data. Reading is done by sending

the write device address (3Ahex), followed by the sub-

address byte (69hex). Without sending a stop condi-

tion, reading of the addressed data is completed by

sending the device read address (3Bhex) and reading

n-bytes of data.

By means of the RESET bit in the CONTROL register,

the MAS 3504D can be reset by the controller.

Due to the internal architecture of the MAS 3504D, the

IC cannot react immediately to an I2C request. The

typical

response

time

about

0.5 ms.

the

MAS 3504D cannot accept another complete byte of

data, it will hold the clock line I2C_CL LOW to force the

transmitter into a wait state. The positions within a

transmission where this may happen are indicated by

’Wait’ in Section 3.3. on page 14. The maximum wait

period of the MAS 3504D during normal operation

mode is less than 4 ms.

Fig. 3–1: I2C bus protocol (MSB first; data must be stable while clock is high)

Note: S =

I2C-Bus Start Condition from master

I2C-Bus Stop Condition from master

A =

Acknowledge-Bit: LOW on I2C_DA from slave or master

N =

Not Acknowledge-Bit: HIGH on I2C_DA from master to indicate ‘End of Read’

Wait =

I2C-Clock line is held low, while the MAS 3504D is processing the I2C command. This waiting time is

max. 1 ms

Table 3–1: I2C Bus Device Addresses

MAS 3504D device

address

Write

Read

MAS_I2C_ADR

3Ahex

3Bhex

Table 3–2: Control Register (Subaddress: 6Ahex)

Name

Subaddress

Bit [8]

Bit : 0-7,

9-15

CONTROL

6Ahex

1: Reset

0 : normal

Table 3–3: I2C Bus Subaddresses

Name

Binary Value

Hex Value

Mode

Function

CONTROL_MAS

0110 1010

6Ahex

Write

control subaddress (see Table 3–2)

WR_MAS

0110 1000

68hex

Write

write subaddress

RD_MAS

0110 1001

69hex

Write

read subaddress

I2C_DA

I2C_CL

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