WM8593 datasheet(96/98 Pages) WOLFSON

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WM8593

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PP Rev 1.0 January 2007

EXAMPLE CONFIGURATION FOR JACK DETECT

The WM8593 contains a jack detect function as described on page 54. In order to use this function,

it is necessary to connect the required GPIO pin to the headphone connector to detect the insertion

of the jack. Figure 74 shows a typical connection scheme:

Figure 74 Example Jack Detect Circuitry

When a jack is not inserted, the mechanical switch in the 3.5mm jack socket is closed and a short

between pin 11 and pin 3 is present. There is a potential divider between DVDD and GND formed by

R1 and R3, and this causes the voltage level at GPIO1 to be:

DVDD * [R3 / (R1 +R3)] = DVDD * [10 / (470 + 10)] = 0.02 * DVDD = logic 0

When a jack is inserted, the mechanical switch in the 3.5mm jack socket is opened and there is no

longer a short between pin 11 and pin 3. The voltage level at GPIO1 is then pulled up to DVDD

through R1 and is therefore logic 1. Therefore, the function of the circuit in Figure 74 is:

JACK STATUS

LOGIC LEVEL AT GPIO1

Not Inserted

Logic 0

Inserted

Logic 1

Table 45 Example Jack Detect Configuration Operation

RELEVANT APPLICATION NOTES

The following application notes, available from www.wolfsonmicro.com, may provide additional

guidance for the use of the WM8593.

DEVICE PERFORMANCE:

WAN0129 – Decoupling and Layout Methodology for Wolfson DACs, ADCs and CODECs

WAN0144 – Using Wolfson Audio DACs and CODECs with Noisy Supplies

WAN0176 – AC Coupling Capacitor Selection

GENERAL:

WAN0108 – Moisture Sensitivity Classification and Plastic IC Packaging

WAN0109 – ESD Damage in Integrated Circuits: Causes and Prevention

WAN0158 – Lead-Free Solder Profiles for Lead-Free Components

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