AK2400 Datasheet, PDF (9/52 Pages) Asahi Kasei Microsystems – High integrated receiver for PMR-LMR

[AK2400]
Digital AC Timing
1) Serial Interface Timing
AK2400 is connected to a CPU by three-wired interface through CSN, SCLK, SDATAIN and SDATAOUT
pins, which can make reading and writing data for control registers.
Serial data named SDATAIN is consist of 1-bit read and write instruction(R/W), 5-bit address (A4 to A0) and
18-bit data(D17 to D0) in one frame.
Write mode
t_CSS
CSN
t_CSLH
t_CSHH
SCLK
t_WH
t_WL
SDATAIN
(Input)
t_DS
t_DH
R/W A4
A3
A2
A0 D17 D16 D15 D1 D0
Read mode
t_CSS
CSN
SCLK
t_WH
t_WL
t_DD
t_CSLH
SDATAIN
(Input)
SDATAOUT
(Output)
R/W A4
A3
A2
A0
D17 D16 D15 D1 D0
Figure 3 Serial Interface Timing
R/W
: Instruction bit controls to write data to AK2400 or read back from it.
When set to low, AK2400 is in write mode. When set to high, AK2400 is in read mode.
A4 to A0 : Register address to be accessed.
D17 to D0 : Write or read date to be accessed.
<1> CSN(Chip select) is normally selected high for disable.
When CSN is set to low, serial interface becomes active.
<2> In write mode, instruction, address and data input from SDATAIN pin are synchronized and
latched with the rising edge of 24 iterations of SCLK clock. Set to low between address A0
and data D17.Input data is fixed synchronized with the rising edge of 24th clock. Note that if
CSN become “H” before 24th clock, setting data becomes invalid. During the period when
CSN is set to “L”, consecutive writing is available.
<3> In read mode, instruction and address are synchronized and latched with the rising edge of
6 iterations of SCLK clock. And the register data are output from SDATAIN pin synchronized
with the falling edge of 18 iterations of SCLK clock.
CSN to “H” once reading is completed because consecutive reading is not valid.
Also, in read mode DETO/SDATAOUT pin should be set to SDATAOUT by
{SDATAOUT_OE}=”1”.
014008989-E-01
9
2015/4