ADT7421ARMZ-2RL ON Semiconductor, ADT7421ARMZ-2RL Datasheet - Page 12

ADT7421ARMZ-2RL

Manufacturer Part Number

ADT7421ARMZ-2RL

Description

IC TEMP MONITOR 8-MSOP

Manufacturer

ON Semiconductor

Type

Temperature Sensorr

Datasheet

1.ADT7421ARMZ-2RL.pdf (20 pages)

Specifications of ADT7421ARMZ-2RL

Input Type

Logic

Output Type

Logic

Interface

2-Wire SMBus

Current - Supply

4mA

Mounting Type

Surface Mount

Package / Case

8-MSOP, Micro8™, 8-uMAX, 8-uSOP,

Full Temp Accuracy

+/- 2.75 C, +/- 3.25 C

Digital Output - Bus Interface

Serial (2-Wire)

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

0 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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serial bus in one operation, but it is not possible to mix read

and write in one operation because the type of operation is

determined at the beginning and cannot subsequently be

SDATA

SCLK

SDATA

Any number of bytes of data are transferable over the

START BY

MASTER

START BY

2. When all data bytes have been read or written,

MASTER

write operation is limited only by what the master

and slave devices can handle.

stop conditions are established. In write mode, the

master pulls the data line high during the tenth

clock pulse to assert a stop condition. In read

mode, the master device overrides the

acknowledge bit by pulling the data line high

during the low period before the ninth clock pulse.

This is known as no acknowledge. The master

takes the data line low during the low period

before the tenth clock pulse, then high during the

tenth clock pulse to assert a stop condition.

Figure 10. Writing a Register Address to the Address Pointer Register,

SERIAL BUS ADDRESS BYTE

Figure 12. Reading from a Previously Selected Register

Figure 11. Writing to the Address Pointer Register Only

FRAME 1

then Writing Data to the Selected Register

SDATA (CONTINUED)

SCLK (CONTINUED)

http://onsemi.com

R/W

ADT7421

ACK. BY

ADT7421

ACK. BY

changed without starting a new operation. For the

ADT7421, write operations contain either one or two bytes,

while read operations contain one byte.

data from it, the address pointer register must be set so that

the correct data register is addressed. The first byte of a write

operation always contains a valid address that is stored in the

address pointer register. If data is to be written to the device,

the write operation contains a second data byte that is written

to the register selected by the address pointer register.

address is sent over the bus followed by R/W set to 0. This

is followed by two data bytes. The first data byte is the

address of the internal data register to be written to, which

is stored in the address pointer register. The second data byte

is the data to be written to the internal data register.

To write data to one of the device data registers, or to read

This procedure is illustrated in Figure 10. The device

ADDRESS POINTER REGISTER BYTE

DATA BYTE

FRAME 3

FRAME 2

ADT7421

ACK. BY

ADT7421

ACK. BY

ADT7421

ACK. BY

ADT7421

ACK. BY

STOP BY

MASTER

STOP BY

MASTER

STOP BY

MASTER

ADT7421ARMZ-2RL ON Semiconductor, ADT7421ARMZ-2RL Datasheet - Page 12

ADT7421ARMZ-2RL

Specifications of ADT7421ARMZ-2RL

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