CS4215 Datasheet, PDF (38/52 Pages) Cirrus Logic – 16-Bit Multimedia Audio Codec

CS4215
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 1kΩ 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.
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DS76F2