CS4215 datasheet(38/52 Pages) CIRRUS

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APPENDIX A

This data sheet describes version 2 of the CS4215. Therefore, this appendix is included to describe the

differences between versions 0,1 and version 2. This information is only useful for users that still have

version 0 and version 1 devices since version 2 devices will supplant the earlier versions. The version

number can be found in control mode, time slot 7. The version can also be identified by the revision

letter stamped on the top of the actual chip. The revision letter immediately precedes the data code on

the second line of the package marking (See General Information section of the Crystal Data Book).

Version 0 corresponds to chip revision C, version 1 corresponds to chip revision D, and version 2 cor-

responds to chip revision E. Future chip revisions (ie. F, G, H) may still be version 2 since the version

number only changes if there is a register change to the part that will affect driver software.

The Functional Differences Between Version 0(Rev. C) and Version 1(Rev. D)

1. FSYNC on version 0 must be ONLY one SCLK period high, whereas on version 1 FSYNC must be

AT LEAST one SCLK period high.

2. When driving an external CMOS clock into one of the XTL-IN pins, version 0 devices must have a

series resistor of at least 1k

Ω between the CS4215 and the clock source. The resistor is needed be-

cause the codec will put XTL-IN to ground (on version 0 only) when that crystal is not selected, as is

the case on power-up. In version 1 the XTL-IN pins are floated when not selected; therefore, the series

resistor is not needed on version 1. Version 1 will work properly if the resistor is included.

3. The OLB and ITS bits do not exist on version 0. Writing these bits as zero makes both versions

function identically; therefore, version 1 is backwards compatible with version 0.

4. When entering control mode, CLKOUT stops 4 to 12 clocks later and may start up briefly when

switching master clock sources on version 0. On version 1 CLKOUT stops within two clocks and

doesn’t start up until data mode is entered.

5. In version 0 the headphone and speaker outputs are not short-circuit protected, whereas in version 1

they are short-circuited protected.

The functional differences between Version 1(Rev. D) and Version 2(Rev. E)

1. The MLB, HPF, and MCK2 bits in control mode do not exist in version 0 or version 1. Writing

these bits as zero makes all versions functionally identical; therefore, version 2 is backwards compat-

ible with previous versions.

2. The A/D invalid bit, ADI, in data mode does not exist in version 0 or version 1.

3. The 8-bit unsigned data format (DF1,0=3) does not exist in version 0 or version 1.

4. SDOUT contained random data during calibration in versions 0 and 1. SDOUT outputs zeros dur-

ing calibration in version 2.

CS4215

DS76F2

CS4215 bảng dữ liệu(PDF) 38 Page - Cirrus Logic