wm8593seft-v Wolfson Microelectronics plc, wm8593seft-v Datasheet - Page 101

• Manufacturer Part Number: wm8593seft-v
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
EXAMPLE CONFIGURATION FOR JACK DETECT
RELEVANT APPLICATION NOTES
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The WM8593 contains a jack detect function as described on page 57. 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 81 shows a typical connection scheme:
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 81 is:
Table 47 Example Jack Detect Configuration Operation
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
Figure 81 Example Jack Detect Circuitry
JACK STATUS
Not Inserted
Inserted
LOGIC LEVEL AT GPIO1
Logic 0
Logic 1
PD Rev 4.0 April 2008
WM8593
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