AK7735EQ Datasheet, PDF (70/142 Pages) Asahi Kasei Microsystems – Dual DSP with 4chADC + 4chDAC + 4chSRC

[AK7735]
■ μP Interface Setting and Pin Statuses
The AK7735 supports both SPI and I²C interfaces. When using SPI interface, release the power-down
state of the AK7735 while the CSN pin is “H”. When using I²C interface, the CSN pin must be pulled up
or down since it becomes a chip address pin. After a power-down release, the AK7735 is set to I²C
interface mode. SPI interface mode become enabled by sending the dummy command mentioned
below.
Input “0xDE → 0xADDA → 0x7A” to the SI/I2CFIL pin while the CSN pin is “L” after a falling edge “↓” of
the CSN pin for the dummy command. The data is in MSB first format.
CSN
SCLK
SI
don’tcare
(L/H)
0xDE (8bit)
0xADDA (16bit)
0x7A(8bit)
don’tcare
(L/H)
Statuses of the CSN, SO/SDA, SCLK/SCL and SI/I2CFIL pins are changed depending on the PDN pin.
PDN pin CSN pin
SO/SDA pin
SCLK/SCL pin SI/I2CFIL pin
SPI
Interface
L
input (“H”)
H
function
Hi-Z
input
function
(pull-up / pull-down)
function
input
function
I²C
Interface
L
“Hi-Z”→ pull-up
input
H
pull-up / pull-down _{function (pull-up)}
function
input
“L”: I²C Fast Mode
“H”: I²C Fast Mode Plus
Table 32. μP Interface Setting
Note
* 63. The CSN pin and the SI/I2CFIL pin should be fixed to “L” or “H” when using I²C interface mode. The
SO/SDA pin should be pulled-up/down when using SPI interface mode.
016014707-E-00
- 70 -
2016/12