STA381BWSTR STMicroelectronics, STA381BWSTR Datasheet - Page 90

• Manufacturer Part Number: STA381BWSTR
• Description: Audio DSPs Sound Terminal 2.1 High EFF Dig Audio
• Manufacturer: STMicroelectronics

Specifications of STA381BWSTR

• Product Category: Audio DSPs
• Rohs: yes
• Operating Supply Voltage: 4.5 V to 25.5 V
• Operating Temperature Range: 0 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: VQFN-48
• Snr: 100 dB

Register description: New Map
6.29
90/171
Figure 26. Short-circuit detection timing diagram (no short detected)
In
in clock cycles, where the clock frequency is defined as in section
clock
carrying the status of the previous EAPD 0->1 toggling (to be noted that after reset this state
is meaningless since no EAPD transition occurs). The GND-related SHOK bits are updated
as soon as the gnd test is completed, the VCC bits are updated after vcc test is completed,
and the SOUT bit is updated after the shorted output test is completed. The gnd test, vcc
test and output test, are always run (if the SHEN bit is active and EAPD toggled to ‘1’), and
only if both tests are successful (no short) do the bridge outputs leave the tristate (indicated
by dotted lines in the figure). If one of the three tests (or all) fail, the power bridge outputs
are kept in the tristate until the procedure is restarted with a new EAPD toggling.
In this figure EAPD is intended to be bit 7 of register 0x05.
Extended coefficient range up to -4...4 (address 0x5A)
Biquads from 1 to 7 have in the STA381BWS the possibility to extend the coefficient range
from [-1,1) to [-4..4) which allows the use of high-shelf filters that may require a coefficient
dynamic greater in absolute value than 1.
Three ranges are available, [-1;1) [-2;2) [-4;4). By default, the extended range is activated.
Each biquad has its independent setting according to the following table.
CEXT_B4[1]
Figure 26
reserved
GNDSH]
D7
D7
OUTSH]
1
0
VCCSH
select. The gray color is used for the short status bits to indicate that the bits are
OUT1A
OUT1B
OUT2A
OUT2B
EAPD
the short protection timing diagram is shown. The time information is expressed
CEXT_B4[0]
reserved
D6
D6
0
0
CEXT_B3[1]
CEXT_B7[1]
cycles
D5
D5
1
1
44
t S
Doc ID 018937 Rev 6
r a
g t
n
d
50005 cycles
e t
CEXT_B3[0]
CEXT_B7[0]
t s
D4
D4
0
0
t S
CEXT_B2[1]
CEXT_B6[1]
r a
v t
c c
D3
D3
1
1
50005 cycles
e t
t s
CEXT_B2[0]
CEXT_B6[0]
Start out test
D2
D2
0
0
TBD cycles
Section 6.13.1: Master
CEXT_B1[1]
CEXT_B51]
1cycle
E
D1
D1
n
1
1
d
f o
S
h
STA381BWS
o
t r
e t
CEXT_B1[0]
CEXT_B5[0]
t s
D0
D0
0
0