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CDB35L00-X4
1.3.1.1
Hybrid Control Resistor Configuration
Each CS35L00 device has a hybrid control resistor. When
the hybrid control resistor for each CS35L00 is populated,
it connects the LFILT+ pin to VBATT and enables the
Standard Class-D functionality (SD or FSD modes) for the
corresponding device. When the hybrid control resistor
for each CS35L00 is not populated, LFILT+ is floating,
and the Hybrid Class-D functionality (HD or FHD modes)
is enabled.
The hybrid control resistors (R13, R23, R33, R43) are lo-
cated on the bottom side of the board adjacent to the
LFILT+ decoupling capacitor and are highlighted in blue
in Figure 1 .
A combination of the hybrid control resistors and the S1
MODE switch allow the CS35L00 devices (U1-U4) on the
CDB35L00-X4 board to be configured in all 4 of the oper-
ational modes. There is no requirement to have the all
four of the CS35L00 devices configured in the same
mode. Each device can be configured to the user’s re-
quirements. Table 2 lists the configuration options avail-
able using the hybrid control resistors and the S1 MODE
switch.
Figure 1. Hybrid Control Resistors
S1 MODE Switch:
GND
VBATT
R13: VBATT
R13: Removed
R23: VBATT
R23: Removed
R33: VBATT
R33: Removed
R43: VBATT
R43: Removed
U1 = FSD
U1 = FHD
U2 = FSD
U2 = FHD
U3 = FSD
U3 = FHD
U4 = FSD
U4 = FHD
U1 = SD
U1 = HD
U2 = SD
U2 = HD
U3 = SD
U3 = HD
U4 = SD
U4 = HD
Table 2. Hybrid Control Resistor & S1 Switch MODE Configurations
4
1.4
Shutdown Control
The S1 switch implements shutdown control for the four CS35L00 devices on the CDB35L00-X4. SD1-2
controls the shutdown for U1 and U2. SD3-4 controls the shutdown for U3 and U4 as shown in Table 3 and
on the schematic in Figure 4 on page 9 .
DS913DB2
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