Datasheet

Register description STA333W
38/49 Doc ID 13365 Rev 2
6.11 Output limit register (addr 0x34)
6.11.1 Thermal and overcurrent warning output limit register
The STA333W 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.
D7 D6 D5 D4 D3 D2 D1 D0
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 10
.... ....
0x01 42
0x00 Inf