AS8506 datasheet(46/89 Pages) AMSCO

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AS8506 – 46

ams Datasheet, Confidential:2013-Sep [1-00]

Devic e I n te r f ac e

Communication to Slaves

There are two modes of communication between the Master

and Slaves in the AS8506 stack system:

• Broadcast Communication

• Communication with Individual Slave

Broadcast Communication

The Broadcast of communication is used to send the reference,

lower, upper threshold limit codes and timer control register

values for all the slaves.

Reference and thresholds can be set by one of the two methods:

• Through the external pins

• Through the Internal DAC

In case of the stacked system, reference and thresholds can be

set by writing DAC values though broadcast SPI command.

Write the corresponding data in the registers of timer_cntl_reg,

ref_dcod_lsb_reg/ref_dcod_msb_reg,

hlmt_dcod_lsb_reg/hlmt_dcod_msb_reg and

llmt_dcod_lsb_reg/llmt_dcod_msb_reg and command in the

Command Registers spi3_cmd_reg and spop_dadd_bcmd_reg.

Example:

To write DAC code of 0x0666 in the lower threshold register of

all the devices, initiate a broadcast command as given in the

below sequence.

Figure 39:

Threshold Setting through Broadcast Command to Slaves

Each broadcast write operation takes 35 clock cycles of the

communication frequency. The default communication

frequency is 5KHz.

Broadcast slave register write is also possible other than above

registers.

If there any specific register of all the slaves to be written with

the same content of Master then this feature is useful.

Write register address in the spop_reg_add_reg.

Command

Address

Data

To set low threshold

llmt_dcod_lsb_reg

0x23

0x66

llmt_dcod_msb_reg

0x24

0x06

Broadcast the cell lower limit DAC code

spop_dadd_bcmd_reg

0x25

0x03

Broadcast communication command

spi3_cmd_reg

0x28

0x09

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