STA382BWSTR datasheet(103/172 Pages) STMICROELECTRONICS

103 / 172 page

STA382BWS

Doc ID 022784 Rev 1

103/172

Direct single-write procedure

Set reg 0x7E bit 0 to 1 and bit 1 to 0 to enable the direct RAM access in single-write

mode.

Write the coefficient value to the device using an I2C bus single-write operation as

discribed in Figure 28.

Figure 28.

Coefficients direct access single-write operation

Direct multi-write procedure

Set the reg 0x7E bit 0 to 1 and bit 1 to 1 to enable direct RAM access in multi-write

mode.

Write the coefficients value to the device using an I2C bus multi-write operation as

discribed in Figure 29. Please note that by using the multi-write procedure, it is possible

to write the entire RAM contents at once.

Figure 29.

Coefficients direct access multiple-write operation

Direct single-read procedure

Set reg 0x7E bit 0 to 1 and bit 1 to 0 to enable the direct RAM access in single-read

mode.

Read the coefficient value from the device using an I2C bus single-read operation as

discribed in Figure 30.

Figure 30.

Coefficients direct access single-read operation

Please be aware that the STA382BWS supports 24-bit coefficients, for this reason in the

above figures Coeff_x(0) is always equal to 0x00 when either reading or writing. The multi-

write procedure embeds a wrap-around mechanism: when trying to write into a location

exceeding the maximum coefficient address, the multi-write procedure will start from

location 0x00.

Slave address

w A

Mem Addr

Coeff_0(3)

Coeff_0(2)

Coeff_0(1)

Coeff_0(0)

Coeff_1(3)

Coeff_1(2)

Coeff_1(1)

Coeff_1(0)

Coeff_n(3)

Coeff_n(2)

Coeff_n(1)

Coeff_n(0)

Obsolete

Product(s)

- Obsolete

Product(s)

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