ES9027PRO datasheet(9/89 Pages) ESS

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ES9027PRO Datasheet

VERSION 0.4.1

ESS TECHNOLOGY, INC. 109 Bonaventura Drive, San Jose, CA 95134, USA Tel (408) 643-8800 • WWW.ESSTECH.COM

Hardware Mode

The ES9027PRO has 32 pre-configured modes that can be set with external pin configuration. These modes configure the DAC for different input

serial data rates and set the DAC muting.

These modes are set with pins:

•

MODE (Pin 17)

•

HW0 (Pin 15)

•

HW1 (Pin 16)

•

HW2 (Pin 30)

•

MUTE_CTRL (Pin 31)

Each hardware mode pin has 4 states:

•

0 – Pin directly connected to GND

•

1 – Pin directly connected to AVDD

•

Pull 0 – Pin pulled to GND through 47kΩ resistor

•

Pull 1 – Pin pulled to AVDD through 47kΩ resistor

Design Information

Each hardware mode pin can be configured with either a pull-up or pull-down resistor. Therefore, it is important that the pin is configured to allow for

the desired hardware modes. Some guidelines include the following:

•

The HW0 and HW1 pins never require a pull up or pull-down resistor.

HW2/

MODE

AVDD or GPIO

47k

HW2/

MODE

47k

Pull-up

Pull-down

GND or GPIO

Figure 2 – Hardware mode pin configurations

Muting

MUTE_CTRL (Pin 31) is used to control the muting of the output and enabling of the Automute feature while in Hardware Mode:

•

0 – Output Muted, No Automute

•

1 – Output Unmuted, No Automute

•

Pull 0 – Output Muted, Automute Enabled

•

Pull 1 – Output Unmuted, Automute Enabled

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