TAS5731MPHPR datasheet(39/81 Pages) TI1

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(1or0)

2 +

(1or0)

2 +(1or0)

+.......(1or0)

–1

–4

–23

2 Bit

Bit

–1

Bit

–4

Bit

–23

M0126-01

Bit

–23

S_xx.xxxx_xxxx_xxxx_xxxx_xxxx_xxx

Bit

–5

Bit

–1

2 Bit

SignBit

2 Bit

M0125-01

ACK

Acknowledge

I CDevice Addressand

Read/WriteBit

R/W

R/W ACK

A0 ACK

ACK

Start

Condition

Stop

Condition

Acknowledge

LastDataByte

ACK

FirstDataByte

RepeatStart

Condition

Not

Acknowledge

I CDevice Addressand

Read/WriteBit

Subaddress

OtherDataBytes

D0 ACK

Acknowledge

T0036-04

TAS5731M

www.ti.com

SLOS838C – JULY 2013 – REVISED AUGUST 2015

Programming (continued)

Figure 64. Multiple-Byte Read Transfer

9.5.2 26-Bit 3.23 Number Format

All mixer gain coefficients are 26-bit coefficients using a 3.23 number format. Numbers formatted as 3.23

numbers means that there are 3 bits to the left of the binary point and 23 bits to the right of the binary point. This

is shown in Figure 65.

Figure 65. 3.23 Format

The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 65. If the

most significant bit is logic 0, the number is a positive number, and the weighting shown yields the correct

number. If the most significant bit is a logic 1, then the number is a negative number. In this case every bit must

be inverted, a 1 added to the result, and then the weighting shown in Figure 66 applied to obtain the magnitude

of the negative number.

Figure 66. Conversion Weighting Factors — 3.23 Format To Floating Point

Gain coefficients, entered via the I2C bus, must be entered as 32-bit binary numbers. The format of the 32-bit

number (4-byte or 8-digit hexadecimal number) is shown in Figure 67.

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