CDB6420 Cirrus Logic Inc, CDB6420 Datasheet - Page 11

• Manufacturer Part Number: CDB6420
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

Specifications of CDB6420

• Silicon Manufacturer: Cirrus Logic
• Application Sub Type: Speakerphone
• Kit Application Type: Audio / Video / TV
• Silicon Core Number: CS6420
• Kit Contents: Board
• Kit Features: Analog And Digital Patch Area
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

to shift the next bit into the shift register. The next
data bit should then be presented to the DATA pin
ready to be latched by the rising edge of STROBE.
This procedure repeats for all sixteen bits as shown
in Figure 5. After the last bit has been shifted in,
DRDY should be brought high to indicate the con-
clusion of the transfer, and four extra STROBE
pulses must be applied to latch the data into the
CS6420.
Since the MCR is a shift register, the STROBE can
be run arbitrarily slow with a duty cycle limited
only by the hold time specified in the Switching
Characterstics table. The Microcontroller Interface
DS205PP2
STROBE
b15
Mic
HD
DRDY
DATA
NErle
AErle
RSD
TSD
b14
Bit15 Bit14 Bit13 Bit12 Bit11 Bit10
b13
NFNse
AFNse
Taps
GB
b12
b11
RHDet
THDet
NCC
ACC
b10
Table 2. MCR Control Register Mapping
Figure 5. Microcontroller Interface
Bit9
b9
TSAtt
HDly
Bit8
b8
Bit7
RVol
TVol
Bit6
b7
NseRmp
TSBias
is read once every 125 s, so it must not be updated
faster than this.
Register Definitions
The four control registers accessible through the
MCR are described in detail in the following tables.
These registers are addressed by bits b2 and b1 of
the MCR. Bit b0 must always be 0. Table 2 shows
the relative bit positions of all the registers. Tables
3 to 6 show the four control registers in more detail.
The Register Map at the top of each register de-
scription shows the names of all the bits, with their
reset values below the bitfield name. The reset val-
ue can also be found in the Word column of the bit-
field summary as indicated by an ‘*’.
Bit5
b6
Bit4
Bit3
b5
RSThd
TSThd
Bit2
b4
Bit1
RGain
TGain
PCSen
HHold
Bit0
b3
1
four extra strobe pulses
b2
0
0
1
1
2
3
CS6420
b1
0
1
0
1
4
b0
0
0
0
0
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