STA309A datasheet(30/67 Pages) STMICROELECTRONICS

30 / 67 page

Registers

STA309A

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Post-scale functionality can be used for power-supply error correction. For multi-channel

applications running off the same power-supply, the post-scale values can be linked to the

value of channel 1 for ease of use and update the values faster.

For ease of use, all channels can use the biquad coefficients loaded into the channel 1

Coefficient RAM space by setting the BQL bit to 1. Therefore, any EQ updates only have to

be performed once.

Table 30.

PSL bit

Bit

RST

Name

Description

PSL

Post-scale link:

0: each channel uses individual post-scale value

1: each channel uses channel 1 post-scale value

Table 31.

BQL bit

Bit

RST

Name

Description

4RW

BQL

Biquad link:

0: each channel uses coefficient values

1: each channel uses channel 1 coefficient values

Table 32.

PWMS bits

Bit

RST

Name

Description

7:5

PWMS[2:0]

PWM speed selection:

Table 33.

PWM output speed

PWMS[1:0]

PWM output speed

000

Normal speed (384 kHz) (all channels

001

Half-speed (192 kHz) (all channels

010

Double-speed (768 kHz) (all channels

011

Normal speed (channels 1-6), double-speed (channels 7-8)

100

Odd speed (341.3 kHz) (all channels)

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