CS43L22 stereo audio DAC pinout · QFN-40

QFN-40 pinout

Locate the pin 1 mark and use the top view unless the drawing specifies a different view.
EP is the exposed center pad on the underside.

Selected pin details

21 · AIN4A

Input · Inputs

Single-ended analog bypass input 4A.

Cirrus Logic DS792F2, § 1

Electrical limits · Link to this pin

All 41 pins

Pin	Signal	Direction	Function
1	SDA Bidirectional	Bidirectional	Open-drain serial control data line. Pull up to VL.
2	SCL Input	Input	I²C control port clock input.
3	AD0 Input	Input	Least significant bit of the seven-bit I²C address.
4	SPKR_OUTA+ Output	Output	Positive PWM output for speaker A. Connect speaker A across its pair.
5	VP Supply	Supply	Power for the PWM speaker output stages.
6	SPKR_OUTA− Output	Output	Negative PWM output for speaker A. This lead is driven and is not ground.
7	SPKR_OUTB+ Output	Output	Positive PWM output for speaker B. Connect speaker B across its pair.
8	VP Supply	Supply	Second supply lead for the PWM output stages.
9	SPKR_OUTB− Output	Output	Negative PWM output for speaker B. This lead is driven and is not ground.
10	−VHPFILT Output	Output	Negative headphone supply filter output. Connect a low-ESR capacitor to ground.
11	FLYN Output	Output	Negative terminal of the charge-pump flying capacitor.
12	FLYP Output	Output	Positive terminal of the charge-pump flying capacitor.
13	+VHP Supply	Supply	Positive headphone amplifier and charge pump supply.
14	HP/LINE_OUTB Output	Output	Channel B headphone or line-level output.
15	HP/LINE_OUTA Output	Output	Channel A headphone or line-level output.
16	VA Supply	Supply	Internal analog supply.
17	AGND Return	Return	Analog ground reference.
18	FILT+ Output	Output	Internal reference filter output. Bypass to ground.
19	VQ Output	Output	Quiescent-voltage filter output.
20	TSTO No connection	No connection	Test output. Leave floating.
21	AIN4A Input	Input	Single-ended analog bypass input 4A.
22	AIN4B Input	Input	Single-ended analog bypass input 4B.
23	AIN3A Input	Input	Single-ended analog bypass input 3A.
24	AIN3B Input	Input	Single-ended analog bypass input 3B.
25	AIN2A Input	Input	Single-ended analog bypass input 2A.
26	AIN2B Input	Input	Single-ended analog bypass input 2B.
27	AFILTA Output	Output	Channel A anti-alias filter connection for analog passthrough.
28	AFILTB Output	Output	Channel B anti-alias filter connection for analog passthrough.
29	AIN1A Input	Input	Single-ended analog bypass input 1A.
30	AIN1B Input	Input	Single-ended analog bypass input 1B.
31	SPKR/HP Input	Input	External speaker/headphone selection input.
32	RESET Input	Input	Active-low hardware reset. Hold low while the supplies settle.
33	VL Supply	Supply	Digital interface supply. Sets the logic voltage for the host and audio ports.
34	VD Supply	Supply	Internal digital core supply.
35	DGND Return	Return	Internal digital ground reference.
36	TSTO No connection	No connection	Second test output. Leave floating.
37	MCLK Input	Input	Master clock for digital audio conversion.
38	SCLK Bidirectional	Bidirectional	Serial audio bit clock. Direction depends on master/slave configuration.
39	SDIN Input	Input	Serial digital audio data input.
40	LRCK Bidirectional	Bidirectional	Audio left/right clock. Direction depends on master/slave configuration.
PAD	EP Thermal pad	Thermal pad	Ground for the speaker PWM output stages and charge pump. Solder to the board ground plane.

Signal assignments

I²C control

Use 0x4A when AD0 is low and 0x4B when it is high. Pull up to VL.

Digital audio

Select the serial audio format and clock ratios from the data sheet.

Headphone or line output

The charge pump provides the negative amplifier rail. Follow Figure 1 for output filtering and the recommended pump capacitors.

PWM speaker outputs

Each speaker is driven by a full bridge across its own pair. Each negative terminal is an active output.

Electrical limits

Parameter	Limit	Conditions and source
Analog, digital and headphone supplies1.65–2.63 V	1.65–2.63 V	VA, VD and +VHP recommended range. Cirrus Logic DS792F2, § 3
PWM speaker supply1.60–5.25 V	1.60–5.25 V	VP recommended range. Cirrus Logic DS792F2, § 3
I²C address with AD0 low0x4A	0x4A	Seven-bit address. The on-wire write address byte is 0x94. Cirrus Logic DS792F2, § 4.12

Models and documents

The map covers the bare 40-contact QFN. The control-port fixture keeps the audio paths powered down and confirms identity before loading an audio configuration.

CS43L22-CNZ: Rail packing.
CS43L22-CNZR: Tape and reel.

Cirrus Logic DS792F2· Pin descriptions, Figure 1, power sequencing, I²C and identification register.
Source register· Document revisions, applicable order codes, consulted sections and available file checksums.