Cirrus Logic CS35L32 - Manual (Page 6)

6 DS963F4
CS35L32
1 Pin Descriptions
RESET
B3 VA 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.
— — Hysteresis
on CMOS
input
Low
FLEN D4 VA I Flash Enable. Input signal commanding a
flash event into both LEDs. It is asserted high.
Weak pull-
down
(~1 M 
— Hysteresis
on CMOS
input
Pulled
down
FLINH C4 VA I Flash Inhibit. Input signal determining
whether the LEDs are in Flash Mode (logic
low) or Flash-Inhibit Mode (logic high, LED
current reduced).
Weak pull-
down
(~1 M 
— Hysteresis
on CMOS
input
Pulled
down
FLOUT1 B6 SPKR
SUPPLY
O LED Driver 1. Output driving LED 1 by sinking
current from the LED cathode
Weak pull-up
(~1 M 
— — SPKR
SUPPLY
FLOUT2/AD0 A6 SPKR
SUPPLY
I/O LED Driver 2/Address Zero. Output driving
LED 2 by sinking current from the LED
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.
Weak pull-up
(~1 M 
— — SPKR
SUPPLY
VBST 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.
— — — —
SPKRSUPPLY E2 — I Speaker Supply. Full-bridge Class D speaker
amplifier power supply.
— —
SW C1, D1 VBST I Boost Converter Switch Node. Connects the
inductor to the rectifying switch.
— — — —
IREF+ 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.
— — — —
IN+ E4 SPKR
SUPPLY
I Input 1 Differential Positive Line. Positive
analog input
— — — —
IN– E3 SPKR
SUPPLY
I Input 1 Differential Negative Line. Negative
analog input
— — — —
SPKOUT+
SPKOUT–/VSENSE–
D2
D3
SPKR
SUPPLY
O Speaker Differential Audio Output. Internal
Class D speaker amplifier output. SPKOUT–
serves as voltage monitor negative sense pin
(VSENSE–).
— — — Hi-Z
ISENSE+
ISENSE–/VSENSE+
E6
E5
SPKR
SUPPLY
I Current Sense Inputs. Sense voltage across
an external resistor in series with SPKOUT+.
ISENSE– serves as voltage monitor positive
sense pin (VSENSE+).
— — — —
FILT+ D6 VA O Positive Voltage Reference. Positive
reference for internal circuits
— — — —
VA C6 — I Analog Input Power. Power supply for
internal analog section
— — — —
VP B1 — I Boost Converter Input Power. Power supply
or battery voltage powering boost converter
— — — —
GNDA C5 — Analog Ground. Ground reference for the
internal analog section of the IC
— — — —
GNDP C2, C3 — Power Ground. Ground reference for boost
converter and Class D amplifier’s output stage
— — — —
GNDPLED B5 — LED Power Ground. Ground reference for
LED current return. Should be tied to ground
plane.
— — — —
Table 1-1. Pin Descriptions (Cont.)
Ball Name
Ball
Number
Power
Supply I/O
Ball Description
Internal
Connection
Driver Receiver State at
Reset
LED
Boost Converter
Audio
Power Supply
General Ground