CS35L32 Datasheet, PDF (6/51 Pages) Cirrus Logic – Boosted Class D Amplifier with Speaker-Protection Monitoring and Flash LED Drivers

CS35L32
1 Pin Descriptions
Ball Name
RESET
Ball
Number
B3
Power
Supply
VA
Table 1-1. Pin Descriptions (Cont.)
I/O
Ball Description
I Reset. When asserted, the device enters a
low-power mode, outputs are set to Hi-Z, and
I²C register values are set to defaults. Outputs
are Hi-Z except those with weak pull-ups or
pull-downs as mentioned.
Internal
Connection
—
LED
FLEN
FLINH
FLOUT1
FLOUT2/AD0
D4
VA I Flash Enable. Input signal commanding a Weak pull-
flash event into both LEDs. It is asserted high. down
(~1 M
C4
VA I Flash Inhibit. Input signal determining
Weak pull-
whether the LEDs are in Flash Mode (logic down
low) or Flash-Inhibit Mode (logic high, LED ^{(~1 M}
current reduced).
B6 SPKR O LED Driver 1. Output driving LED 1 by sinking Weak pull-up
SUPPLY current from the LED cathode
(~1 M
A6 SPKR I/O LED Driver 2/Address Zero. Output driving Weak pull-up
SUPPLY LED 2 by sinking current from the LED
(~1 M
cathode. AD0 programs the chip address
when RESET is deasserted. If no LED is used,
tying the pin to ground clears the chip address
LSB. Otherwise, the LSB is set.
Boost Converter
VBST
SPKRSUPPLY
SW
IREF+
E1
— O Boost Converter Output. Output of boosted
—
supply. This pin cannot be used to drive any
external loads other than the on chip Class D
Amplifier and Flash LEDs.
E2
—
I Speaker Supply. Full-bridge Class D speaker
—
amplifier power supply.
C1, D1 VBST I Boost Converter Switch Node. Connects the
—
inductor to the rectifying switch.
D5
VA I Current Reference Resistor. Connection for
—
an external resistor to be used for generating
the CS35L32’s internal main current reference.
See Fig. 2-1 for required resistor value.
Audio
IN+
E4 SPKR I Input 1 Differential Positive Line. Positive
—
SUPPLY analog input
IN–
E3 SPKR I Input 1 Differential Negative Line. Negative
—
SUPPLY analog input
SPKOUT+
D2 SPKR O Speaker Differential Audio Output. Internal
—
SPKOUT–/VSENSE– D3 SUPPLY Class D speaker amplifier output. SPKOUT–
serves as voltage monitor negative sense pin
(VSENSE–).
ISENSE+
E6
SPKR I Current Sense Inputs. Sense voltage across
—
ISENSE–/VSENSE+ E5 SUPPLY an external resistor in series with SPKOUT+.
ISENSE– serves as voltage monitor positive
sense pin (VSENSE+).
Power Supply
FILT+
VA
VP
D6
VA O Positive Voltage Reference. Positive
—
reference for internal circuits
C6
—
I Analog Input Power. Power supply for
—
internal analog section
B1
—
I Boost Converter Input Power. Power supply
—
or battery voltage powering boost converter
General Ground
GNDA
GNDP
GNDPLED
C5
—
C2, C3 —
B5
—
Analog Ground. Ground reference for the
—
internal analog section of the IC
Power Ground. Ground reference for boost
—
converter and Class D amplifier’s output stage
LED Power Ground. Ground reference for
—
LED current return. Should be tied to ground
plane.
Driver
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Receiver
State at
Reset
Hysteresis Low
on CMOS
input
Hysteresis Pulled
on CMOS down
input
Hysteresis Pulled
on CMOS down
input
— SPKR
SUPPLY
— SPKR
SUPPLY
—
—
—
—
—
—
—
—
—
—
—
—
Hi-Z
—
—
—
—
—
—
—
—
—
—
—
—
—
—
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DS963F5