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Datasheet

Datasheet

BD7844AEFV-LB

© 2012 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・15・001

TSZ02201-0G3G0CZ10310-1-2

26.Feb.2014 Rev.002

Function explaining - continued

1-2. Slave address for all call

[1011000] is used as a slave address for all call. (Figure 4)

1

0

1

1

0

0

0

R/W

Figure 4. Slave address for all call

All BD7844AEFV-LB on the bus can control in the command at the same time by the slave address for all call. It enters

the state that can respond to all call when power supply (VDD) is turned on.

It can be selected not to respond when the ALL CALL bit of mode1 register is set to logic “0”.

Because the register data is returned from all BD7844AEFV-LB on the bus when the last R/W bit of the slave address

byte is set to logic "1" (read) when the slave address for all calls is used, the master cannot read the register data of

specific BD7844AEFV-LB.

Please use a usual slave address to read the register data of specific BD7844AEFV-LB.

1-3. Slave address for software reset

[1011011] is used as a slave address for software reset. (Figure 5)

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0

1

1

0

1

1

0

Figure 5. Slave address for software reset

All BD7844AEFV-LB on the bus can be reset at the same time by the slave address for software reset.

It is necessary to use the slave address for software reset with R/W=0. BD7844AEFV-LB doesn't recognize software

reset for R/W=1. Please refer to "3-2. Software reset" for details.

Take care: Because slave address [1011011] for software reset is a reserved address, It is not possible

to use it as a usual slave address.

Take care: Slave address [1011000] for all calls must not use as a usual slave address because it becomes

enable when power supply (VDD) is turned on.

Slave address for all call

Unavailable in address terminal

Slave address for software reset

Unavailable in address terminal

R/W