CS8405A-CS datasheet(16/37 Pages) CIRRUS

16 / 37 page

CS8405A

DS469F2

of the chip address, and should be connected to

VL+ or DGND as desired. The upper four bits of the

seven-bit address field are fixed at 0010. To com-

municate with a CS8405A, the chip address field,

which is the first byte sent to the CS8405A, should

match 0010 followed by the settings of AD2, 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

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

acknowledge bit, ACK, which is output from the

CS8405A after each input byte is read. The ACK

bit is input to the CS8405A from the microcontroller

after each transmitted byte. I²C mode is supported

only with VL+ = 5.0 V.

6.3

Interrupts

The CS8405A has a comprehensive interrupt ca-

pability. The INT output pin is intended to drive the

interrupt input pin on the host microcontroller. The

INT pin may be set to be active low, active high or

active low with no active pull-up transistor. This last

mode is used for active low, wired-OR hook-ups,

with multiple peripherals connected to the micro-

controller interrupt input pin.

Many conditions can cause an interrupt, as listed in

the interrupt status register descriptions. Each

source may be masked off by a bit in the mask reg-

isters. In addition, each source may be set to rising

edge, falling edge, or level sensitive. Combined

with the option of level sensitive or edge sensitive

modes within the microcontroller, many different

set-ups are possible, depending on the needs of

the equipment designer.

SD A

SC L

00 10

AD 2-0

R/W

Start

AC K

D ATA7-0

AC K

DATA7 -0

AC K

Stop

No te 2

Note 1

Note 3

Figure 9. Control Port Timing in

I²C Mode

Notes: 1. AD2, 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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