CS42406 datasheet(37/50 Pages) CIRRUS

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CS42406

4.10.1a

INCR (Auto Map Increment)

The CS42406 has MAP auto increment capability enabled by the INCR bit (the MSB) of the MAP. If INCR

is set to 0, MAP will stay constant for successive I²C writes or reads and SPI writes. If INCR is set to 1,

MAP will auto increment after each byte is written, allowing block reads or writes of successive registers.

Default = ‘0’

0 - Disabled

1 - Enabled

4.10.1b

MAP0-3 (Memory Address Pointer)

Default = ‘0000’

4.10.2

I²C Mode

In the I²C mode, data is clocked into and out of the bi-directional serial control data line, SDA, by the serial

control port clock, SCL. There is no CS pin. Pin AD0 enables the user to alter the chip address

(001000[AD0][R/W]) and should be tied to VLC or GND as required, before powering up the device. If the

device ever detects a high to low transition on the AD0/CS pin after power-up, SPI mode will be selected.

4.10.2a

I²C Write

To write to the device, follow the procedure below while adhering to the control port timing as described

in “Switching Specifications - Control Port Interface” on page 27.

1) Initiate a START condition to the I²C bus followed by the address byte. The upper 6 bits must be

001000. The seventh bit must match the setting of the AD0 pin, and the eighth must be 0. The eighth

bit of the address byte is the R/W bit.

2) Wait for an acknowledge (ACK) from the part, then write to the memory address pointer, MAP. This

byte points to the register to be written.

3) Wait for an acknowledge (ACK) from the part, then write the desired data to the register pointed to by

the MAP.

4) If the INCR bit (see section 4.10.1a) is set to 1, repeat the previous step until all the desired registers

are written, then initiate a STOP condition to the bus.

5) If the INCR bit is set to 0 and further I²C writes to other registers are desired, it is necessary to repeat

the procedure detailed from step 1. If no further writes to other registers are desired, initiate a STOP

condition to the bus.

4.10.2b

I²C Read

To read from the device, follow the procedure below while adhering to the control port Switching Specifi-

cations. During this operation it is first necessary to write to the device, specifying the appropriate register

through the MAP.

SD A

SC L

001000

AD 0

Sta rt

AC K

MAP

1-8

AC K

DATA

1-8

AC K

Stop

Figure 38. I²C Write

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