STA380WS datasheet(39/48 Pages) STMICROELECTRONICS

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STA380WS

channel. An independent postscale is provided for each channel but all channels can use

channel 1 postscale factor by setting the postscale link bit. By default, all postscale factors

are set to 0x7F (pass-through).

6.11

Output limit register (addr 0x34)

6.11.1

Thermal and overcurrent warning output limit register

The STA380WS provides a simple mechanism for reacting to a thermal or overcurrent

warning in the power device. When the TWARN or OCWARN status bit is asserted, the

output is limited to the OLIM setting. The limit can be adjusted by modifying the thermal

warning/overcurrent output limit value. As for the normal postscale, the register value

represents 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 both channels. The

scaling value range is from 0x80 = -1 to 0x7F = 0.992. To avoid phase changes in the output

signal, only the positive range is used (0x00 to 0x7F). The default setting of 0x5A provides a

-3-dB limit.

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

thermal warning situation disappears. If the cause of the limiting is an overcurrent warning,

output limiting remains in effect until the device is reset.

OLIM7

OLIM6

OLIM5

OLIM4

OLIM3

OLIM2

OLIM1

OLIM0

01011010

Table 46. Output limit values for thermal and overcurrent warnings

OLIM [7:0]

Attenuation (dB)

0x7F

0.06

0x7E

0.13

....

0x5A

3.0

....

0x40

6.0

....

0x28

....

0x01

0x00

Inf

Obsolete

Product(s)

- Obsolete

Product(s)

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