ES9219C datasheet(14/67 Pages) ESS

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ES9219 Datasheet

February 27, 2020

CONFIDENTIAL ADVANCE INFORMATION 1.0.4

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

Data Clock

DATA_CLOCK must be (2 x i2s_length) x FSR for PCM mode, and FSR for DSD modes. This pin should be pulled low if not used.

Built-in Digital Filters

Two built-in digital filters are included for PCM mode. A programmable FIR filter is also included.

See PCM Filter Frequency Response for filter characteristics and Register 7: FILTER SHAPE AND SYSTEM MUTE for available filter settings.

Programmable FIR filter

A two stage interpolating FIR design is used. The interpolating FIR filter is generated using MATLAB, and can then be downloaded using a custom

C code.

Example Source Code for Loading a Filter

// only accept 128 or 16 coefficients

// Note:

The coefficients must be quantized to 24 bits for this method!

// Note:

Stage 1 consists of 128 values (0-127 being the coefficients)

// Note:

Stage 2 consists of 16 values (0-13 being the coefficients, 14-15 are zeros)

// Note:

Stage 2 is symmetric about coefficient 13.

See the example filters for more information.

byte reg40 = (byte)(coeffs.Count == 128 ? 0 : 128);

for (int i = 0; i < coeffs.Count; i++)

{

// stage 1 contains 128 coefficients, while stage 2 contains 16 coefficients

registers.WriteRegister(40, (byte)(reg26 + i));

// write the coefficient data

registers.WriteRegister(41, (byte)(coeffs[i] & 0xff));

registers.WriteRegister(42, (byte)((coeffs[i] >> 8) & 0xff));

registers.WriteRegister(43, (byte)((coeffs[i] >> 16) & 0xff));

registers.WriteRegister(44, 0x02);

// set the write enable bit

}

// disable the write enable bit when we’re done

registers.WriteRegister(44, (byte)(setEvenBit ? 0x04 : 0x00));

For more information on programming a custom filter, contact your local FAE.

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