X40231 Datasheet, PDF(9/36 Page) Intersil Corporation – Triple Voltage Monitors, POR, 2 kbit EEPROM MEMORY, and Single/Dual DCP

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

X40231 Datasheet, PDF (9/36 Pages) Intersil Corporation – Triple Voltage Monitors, POR, 2 kbit EEPROM MEMORY, and Single/Dual DCP

◁

X40231, X40233, X40235, X40237, X40239

SCL

SDA

Start

Stop

Figure 2. Valid Start and Stop Conditions

Serial Start Condition

All commands are preceded by the START condition,

which is a HIGH to LOW transition of SDA while SCL

is HIGH. The device continuously monitors the SDA

and SCL lines for the START condition and does not

respond to any command until this condition has been

met. See Figure 2.

Serial Stop Condition

All communications must be terminated by a STOP

condition, which is a LOW to HIGH transition of SDA

while SCL is HIGH. The STOP condition is also used

to place the device into the Standby power mode after

a read sequence. A STOP condition can only be

issued after the transmitting device has released the

bus. See Figure 2.

Serial Acknowledge

An ACKNOWLEDGE (ACK) is a software convention

used to indicate a successful data transfer. The trans-

mitting device, either master or slave, will release the

bus after transmitting eight bits. During the ninth clock

cycle, the receiver will pull the SDA line LOW to

ACKNOWLEDGE that it received the eight bits of data.

Refer to Figure 3

The device will respond with an ACKNOWLEDGE

after recognition of a START condition if the correct

Device Identifier bits are contained in the Slave

Address Byte. If a write operation is selected, the

device will respond with an ACKNOWLEDGE after the

receipt of each subsequent eight bit word.

In the read mode, the device will transmit eight bits of

data, release the SDA line, then monitor the line for an

ACKNOWLEDGE. If an ACKNOWLEDGE is detected

and no STOP condition is generated by the master,

the device will continue to transmit data. The device

will terminate further data transmissions if an

ACKNOWLEDGE is not detected. The master must

then issue a STOP condition to place the device into a

known state.

DEVICE INTERNAL ADDRESSING

Addressing Protocol Overview

The user addressable internal components of the

X4023x can be split up into three main parts:

âOne or Two Digitally Controlled Potentiometers

(DCPs)

âEEPROM array

âControl and Status (CR) Register

SCL from

Master

Data Output from

Transmitter

Data Output

from Receiver

Start

Acknowledge

Figure 3. Acknowledge Response From Receiver

FN8115.0

April 11, 2005

▷