AK4101 Ver la hoja de datos (PDF) - Asahi Kasei Microdevices
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AK4101 Datasheet PDF : 28 Pages
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ASAHI KASEI
[AK4101]
Serial Control Interface
In asynchronous mode, four of the dual function pins become CSN, CCLK, CDTI and CDTO, a 4 wire microprocessor
interface. The internal 66 byte control register can then be read and written. The contents of the control register define,
in part, the mode of operation for the AK4101. Figure 17 illustrates the serial data flow associated with SCI read and
write operations. C1-0 is the chip address. The AK4101 looks for C1-0 to be a “11” before responding to the incoming
data. R/W is the Read/Write bit which is “L” for a read operation and “H” for a write operation. The register address
contained in A7-0 is decoded to select a particular byte of the control register. D7-0 on CDTI is the control data coming
from the microprocessor during a write operation. D7-0 on CDTO is the contents of the addressed byte from the control
register requested during a read operation. The address and data bits are framed by CSN=0. During a write operation,
each address and data bit is sampled on the rising edge of CCLK. During a read operation, the address bits are sampled
on the rising edge of CCLK while data on CDTO is output on the falling edge of CCLK. CCLK has a maximum
frequency of 5 MHz.
CSN
CCLK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
CDTI
WRITE
CDTO
READ
CDTI
CDTO
C1 C0 * * * * * R/W A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
Hi-Z (with pull-down resistor)
“L”
C1 C0 * * * * * R/W A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
Hi-Z (with pull-down resistor)
Hi-Z
D7 D6 D5 D4 D3 D2 D1 D0
C1-C0: Chip Address (Fixed to “11”)
R/W: READ/WRITE (0:READ, 1:WRITE)
*:
Don’t care
A7-A0: Register Address
D7-D0: Control Data
Figure 17. Control I/F Timing
AK4101
CSN
CCLK
CDTI
CDTO
AK4101
CSN
CCLK
CDTI
CDTO
µP
CSN1
CCLK
CDTI
CDTO
CSN2
Figure 18. Typical connection with µP
Note: External pull-up resistor should not be attached to CDTO pins
since CDTO pin is internally connected to the pull-down resistor.
MS0076-E-01
- 20 -
2001/12
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