ES9218PC datasheet(20/101 Pages) ESS

20 / 101 page

ES9218P Datasheet

December 6, 2018

CONFIDENTIAL ADVANCE INFORMATION 1.8

ESS TECHNOLOGY, INC. 237 South Hillview Drive, Milpitas, CA 95035, USA Tel (408) 643-8800 • Fax (408) 643-8801

Overcurrent Protection

Overcurrent Protection (OCP) protects the amplifier output stage by independently sensing the positive and negative output current on the OUT_R

and OUT_L pins. Once the current exceeds a built-in threshold for a cumulative user programmable timeout period, an OCP event will be triggered

and both DAC channels will be muted.

OCP must be enabled and configured using oc_sd_en and oc_sd_gain in Register 11: Overcurrent Protection (0x0B); it is disabled by default.

When an overcurrent event is triggered, oc_sd_mute Register 72 (Read-Only): Input Selection and Automute Status (0x48) will be set and latched to

indicate which channel triggered the event.

OCP does not automatically reset when the overcurrent condition is removed. After an OCP event occurs, the state of the OCP circuit needs to be

manually cleared. This is accomplished by toggling OCP disabled-enabled with oc_sd_en.

Once enabled, the OCP status can be monitored in one of two ways:

1. Poll the oc_sd_mute flags in Register 72 (Read-Only): Input Selection and Automute Status (0x48).

2. Configure Register 8: GPIO1-2 Configuration (0x08) to set the desired GPIO pin to Interrupt mode and set Register 33: Interrupt Mask

(0x21) appropriately.

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