CS8416-CS datasheet(21/48 Pages) CIRRUS

21 / 48 page

CS8416

DS578PP2

read/write bit (R/W) high. The next falling edge of

CCLK will clock out the MSB of the addressed

state). If the MAP auto increment bit is set to 1, the

data for successive registers will appear consecu-

tively.

The auto increment function is strictly linear. This

may result in operations on undefined registers.

Reads from undefined registers will produce inde-

terminate results. Writing to undefined registers

will be ignored.

6.2

I2C Mode

In I2C mode, SDA is a bidirectional data line. Data

is clocked into and out of the part by the clock,

SCL, with the clock to data relationship as shown

in Figure 12. There is no CS pin. Each individual

CS8416 is given a unique address. Pins AD0 and

AD1 form the two least significant bits of the chip

address and should be connected to VL+ or DGND

as desired. The GPO2 pin is used to set the AD2 bit

by connecting a 47K resistor from the GPO2 pin to

VL+ or to DGND. The state of the pin is sensed

while the CS8416 is being reset. The upper 4 bits of

the 7-bit address field are fixed at 0010. To com-

municate with a CS8416, the chip address field,

which is the first byte sent to the CS8416, should

match 0010 followed by the settings of the GPO2,

AD1, and AD0. The eighth bit of the address is the

R/W bit. If the operation is a write, the next byte is

the Memory Address Pointer (MAP) which selects

the register to be read or written. If the operation is

a read, the contents of the register pointed to by the

MAP will be output. Setting the auto increment bit

in MAP allows successive reads or writes of con-

secutive registers. Each byte is separated by an ac-

knowledge bit. The ACK bit is output from the

CS8416 after each input byte is read, and is input to

the CS8416 from the microcontroller after each

transmitted byte.

SDA

SCL

0010

AD2-0

R/W

Start

ACK

DATA7-0

ACK

DATA7-0

ACK

Stop

Note 2

Note 1

Note 3

Figure 12. Control Port Timing in I2CMode

Notes: 1. AD2 is derived from a resistor attached to the

GPO2 pin.

AD1 and AD0 are determined by the state of the corresponding pins.

2. If operation is a write, this byte contains the Memory Address Pointer, MAP.

3. If operation is a read, the last bit of the read should be NACK (high).

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