STA333W datasheet(36/42 Pages) STMICROELECTRONICS

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STA333W

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7.10.2

Channel 2 post scale

The STA333W provides one additional multiplication after the last interpolation stage and

the distortion compensation on each channel, which can be used to limit the maximum

modulation index and therefore the peak current through the power device. The register

values represent an 8-bit signed fractional number. This number is extended to a 24-bit

number by adding zeros to the right and then directly multiplied by the data on that channel.

An independent post-scale is provided for each channel but all channels can use the

channel 1 post-scale factor by setting the post-scale link bit. By default, all post-scale factors

are set to 0x7F (pass-through).

7.11

Output limit register (address 0x34)

7.11.1

Thermal and over-current warning output limit register

The STA333W provides a simple mechanism for reacting to a thermal or over-current

warning in the power-device. When the TWARN or OCWARN input is asserted, the OLIM

setting is used to limit the output to that value. The default setting of 0x5A provides -3dB

limit. The limit in this situation can be adjusted by modifying the thermal warning/over-

current output limit value.

If the cause of the limiting was a thermal warning, the output limiting is removed when the

thermal warning situation disappears. If the cause of the limiting was an over-current

warning, the output limiting remains in effect until the device is reset.

C2PS7

C2PS6

C2PS5

C2PS4

C2PS3

C2PS2

C2PS1

C2PS0

01111111

OLIM7

OLIM6

OLIM5

OLIM4

OLIM3

OLIM2

OLIM1

OLIM0

1011010

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