MAX14521E_15 Datasheet, PDF(18/21 Page) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

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MAX14521E_15 Datasheet, PDF (18/21 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

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MAX14521E

Quad, High-Voltage EL Lamp Driver

with I2C Interface

Read Data Format

Send the slave address with the R/W set to 1 to initiate

a read operation. The MAX14521E acknowledges receipt

of its slave address by pulling SDA low during the 9th

SCL clock pulse. A START command followed by a read

command resets the address pointer to register 0x00.

The first byte transmitted from the MAX14521E will be the

contents of register 0x00. Transmitted data is valid on the

rising edge of the master-generated serial clock (SCL).

The address pointer autoincrements after each read

data byte. This autoincrement feature allows all registers

to be read sequentially within one continuous frame. A

STOP condition can be issued after any number of read

databytes. If a STOP condition is issued followed by

another read operation, the first data byte to be read will

be from register 0x00 and subsequent reads will autoin-

crement the address pointer until the next STOP condition.

The address pointer can be preset to a specific register

before a read command is issued. The master presets the

address pointer by first sending the MAX14521Eâs slave

address with the R/W bit set to 0 followed by the register

address. A REPEATED START condition is then sent,

followed by the slave address with the R/W set to 1. The

MAX14521E transmits the contents of the specified regis-

ter. The address pointer autoincrements after transmitting

the first byte. Attempting to read from register addresses

higher than 0x0B results in repeated reads of 0x0B. The

master acknowledges receipt of each read byte during the

acknowledge clock pulse. The master must acknowledge

all correctly received bytes except the last byte. The final

byte must be followed by a not acknowledge from the

master and then a STOP condition. Figure 6 illustrates the

frame format for reading one byte from the MAX14521E.

Figure 7 illustrates the frame format for reading multiple

bytes from the MAX14521E.

ACKNOWLEDGE FROM MAX14521E

S SLAVE ADDRESS

R/W

A Sr

REPEATED START

NOT ACKNOWLEDGE FROM MASTER

ACKNOWLEDGE

FROM MAX14521E

SLAVE ADDRESS

DATA BYTE

R/W

1 BYTE

AUTOINCREMENT INTERNAL

Figure 6. Reading One Indexed Byte of Data from the MAX14521E

ACKNOWLEDGE

FROM MAX14521E

S SLAVE ADDRESS

R/W

ACKNOWLEDGE

FROM MAX14521E

ACKNOWLEDGE

FROM MAX14521E

A Sr

REPEATED START

SLAVE ADDRESS

R/W

Figure 7. Reading n-Bytes of Indexed Data from the MAX14521E

DATA BYTE

1 BYTE

AUTOINCREMENT INTERNAL

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