MAX20317EWP+

MAX20317EWP+ is an I²C controllable, universal 3.5mmØ accessory management IC. This device provides a universal jack interface solution, as well as a compact solution for the power management and interface control of a powered accessory, such as an active noise cancelling (ANC) headset. It automatically measures headset impedance with a high precision, triple current source 8-bit ADC. After impedance detection, this device also detects when a headset is in a CTIA or OMTP configuration and automatically configures the SLEEVE and RING2 terminals to correctly connect the microphone and ground lines. When a boost supply is applied, the MAX20317 can detect the presence of an ANC headset. When the ANC headset is detected and enabled, a button-press monitoring circuit activates and flags button presses by detecting the voltage drop across a sense resistor. It is used in applications such as smartphones, phablet, tablet PCs, notebook PCs.

• Auto-configuration for CTIA and OMTP headsets, supports MEMS microphone, 50mohm ground switch
• Bypass switch to power accessories such as ANC headsets, powered accessory/headset detection
• Bidirectional digital data communication in power mode
• Power line communication by 3.5mm jack, allow emergence of new accessory types
• Adaptive volume control based on precision headset impedance, false insertion detection
• Supply voltage range from 3V to 5.5V, VCC POR is 1.7V typical at (VCC = +3.5V, TA = +25°C)
• VCC supply current is 2µA typical at (VCC = +3.5V, DETIN = 1)
• G-SNS switch bandwidth is 300MHz typical at (RSOURCE = RLOAD = 50 ohm, CLOAD = 10pF)
• G-SNS switch turn-on time is 50µs typical at (VCC = +3.5V, TA = +25°C)
• Operating temperature range from -40°C to +85°C, 20-pin WLP package

Hinweise

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