X40420V14Z-B datasheet(11/25 Pages) INTERSIL

Part #	X40420V14Z-B

Description	Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch

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Manufacturer	INTERSIL [Intersil Corporation]

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May 25, 2006

Figure 8. Valid Start and Stop Conditions

Serial Acknowledge

Acknowledge is a software convention used to indi-

cate successful data transfer. The transmitting device,

either master or slave, will release the bus after trans-

mitting 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. See Figure 9.

The device will respond with an acknowledge after

recognition of a start condition and if the correct

Device Identifier and Select 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. The device

will acknowledge all incoming data and address bytes,

except for the Slave Address Byte when the Device

Identifier and/or Select bits are incorrect.

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 return the device to Standby mode and place the

device into a known state.

Serial Write Operations

Byte Write

For a write operation, the device requires the Slave

Address Byte and a Word Address Byte. This gives

the master access to any one of the words in the

array. After receipt of the Word Address Byte, the

device responds with an acknowledge, and awaits the

next eight bits of data. After receiving the 8 bits of the

Data Byte, the device again responds with an

acknowledge. The master then terminates the transfer

by generating a stop condition, at which time the

device begins the internal write cycle to the nonvolatile

memory. During this internal write cycle, the device

inputs are disabled, so the device will not respond to any

requests from the master. The SDA output is at high

impedance. See Figure 12.

A write to a protected block of memory will suppress

the acknowledge bit.

Figure 9. Acknowledge Response From Receiver

SCL

SDA

Start

Stop

Data Output

from

Data Output

from Receiver

8

1

9

Start

Acknowledge

SCL from

Master

X40420, X40421

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